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Artigos de revistas sobre o assunto "Minerals in literature"
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BARTON, ISABEL. "MINING, ALCHEMY, AND THE CHANGING CONCEPT OF MINERALS FROM ANTIQUITY TO EARLY MODERNITY". Earth Sciences History 41, n.º 1 (1 de janeiro de 2022): 1–15. http://dx.doi.org/10.17704/1944-6187-41.1.1.
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ABSTRACT This paper analyzes how the Western concept of minerals evolved over time. Greco-Roman philosophers saw minerals as a form of plant that yielded useful metals or medicines. Most of their data came from mines and focused on ore minerals, but medicinal uses were more highly regarded and were the principal intentional focus of early mineral literature. As mining waned in the early medieval period, the focus of mineral literature shifted to emphasize gemstones rather than ores and mysticism rather than metallurgy, while medicine continued to be prominent. Descriptions from firsthand observation became rare. Starting in the 9th century AD, an inorganic concept of minerals as chemicals began to arise from alchemical experiments in the Middle East. The alchemical mineral literature demonstrated that minerals differed from plants in being separable into constituent ingredients by chemical processes, focusing on ores. The sulfur-mercury model of mineral origin also reflects a strong emphasis on metal ores at the expense of other minerals. As mining rates increased again in Europe after the 10th century, this alchemical concept of minerals caught on. However, the alchemical model acquired a spiritual gloss, leading to a divide in the 16th century between a spiritualized organic model of minerals and an inorganic or mechanical alternative, both focused mainly on ores. Eventually the concept of spiritual or living minerals diverged from the mineral to the alchemical literature in the 16th century, as the mechanical model evolved into the modern chemical identification of minerals.
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Silva, Samanthi, e Stefan Schaltegger. "Social assessment and management of conflict minerals: a systematic literature review". Sustainability Accounting, Management and Policy Journal 10, n.º 1 (4 de março de 2019): 157–82. http://dx.doi.org/10.1108/sampj-02-2018-0029.
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Purpose The necessity to assess and manage supply chains to be free from social problems such as human and labour rights abuses has become particularly apparent since the introduction of conflict minerals regulations in the United States (Dodd-Frank Act) and the European Union. Similarly, stakeholders demand that products are free from social problems. Ever more companies are therefore challenged to assess and manage social issues in their supply chains. At the same time, the increasing literature on assessment and management of social issues is disperse and an overview missing. This paper aims to provide an overview of the existing literature on social assessment and management approaches relating to conflict minerals and connected to social issues in supply chains. Design/methodology/approach A review of the academic literature on social assessment and management of conflict minerals to provide an overview is currently missing. This paper addresses this gap by systematically reviewing the existing research literature on approaches for the social assessment and management of conflict minerals from a supply chain perspective. Findings The systematic literature review found 21 social assessment and 30 social management approaches with reference to conflict minerals, with the most referenced approach being the OECD guidelines. Overall, the conflict mineral related literature discusses rather general social assessment and management approaches, such as codes of conduct, while the effectiveness of the approaches is not analysed in depth. The paper finds that an analysis of the effectiveness and interlinkages of different approaches is missing. The large variety of social and human rights issues addressed in the academic literature ranges from corruption to violence, going beyond the scope of regulations focused on conflict minerals. This indicates that regulations on conflict minerals and the consequences for management are seen as a specific case with wider implications for future regulations and the necessity for management to solve social problems in supply chains in an effective way. Research limitations/implications The review paper is conceptual and develops a framework to classify social assessment and management approaches for conflict minerals, drawing on the supply chain management literature. Practical implications The overview reveals that research refers to broader social assessment and management approaches indicating wider implications for assessing and managing social issues in supply chains in general, irrespective of whether they are conflict mineral related. Research has, however, so far not addressed the effectiveness and interlinkages between social assessment and management approaches. The aim of the emerging regulations, however, is to foster more effective management of social issues in supply chains. Management is therefore challenged to develop and implement innovative approaches to effectively reduce social problems in supply chains beyond conflict minerals. Conclusions are drawn for management and research. Social implications The paper highlights the need for collaboration with NGOs, industry associations and suppliers, recommending to engage in supplier development. Originality/value The paper conducts the first systematic review of academic literature on conflict mineral related social assessment and management approaches. A framework is proposed to classify social assessment and management approaches based on supply chain management literature. While conflict minerals often represent a small fraction of components in a product, they can have huge and costly implications for companies, which require (potentially) large changes for the sourcing and supply strategy of a company. Conflict mineral regulations represent the first attempt to regulate social and human rights abuses in supply chains holding companies responsible for misconduct caused by suppliers abroad.
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Tako, Elad. "Dietary Trace Minerals". Nutrients 11, n.º 11 (19 de novembro de 2019): 2823. http://dx.doi.org/10.3390/nu11112823.
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Dietary trace minerals are pivotal and hold a key role in numerous metabolic processes. Trace mineral deficiencies (except for iodine, iron, and zinc) do not often develop spontaneously in adults on ordinary diets; infants are more vulnerable because their growth is rapid and intake varies. Trace mineral imbalances can result from hereditary disorders (e.g., hemochromatosis, Wilson disease), kidney dialysis, parenteral nutrition, restrictive diets prescribed for people with inborn errors of metabolism, or various popular diet plans. The Special Issue “Dietary Trace Minerals” comprised 13 peer-reviewed papers on the most recent evidence regarding the dietary intake of trace minerals, as well as their effect toward the prevention and treatment of non-communicable diseases. Original contributions and literature reviews further demonstrated the crucial and central part that dietary trace minerals play in human health and development. This editorial provides a brief and concise overview that addresses and summarizes the content of the Dietary Trace Minerals Special Issue.
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Smith, D. G. W., e E. H. Nickel. "Codification of unnamed minerals". Mineralogical Magazine 71, n.º 5 (outubro de 2007): 587–89. http://dx.doi.org/10.1180/minmag.2007.071.5.587.
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AbstractThe Subcommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification (CNMNC, formerly CNMMN) has developed a codification system that includes the year of publication and qualitative chemical composition for unnamed minerals reported in the literature. Such minerals are divided into two categories: (1) those regarded as being ‘valid as unnamed minerals’ are those that do not correspond to existing species, have not been reported previously and whose published descriptions enable them to be recognized if found elsewhere. (2) Unnamed minerals regarded as being ‘invalid as unnamed minerals’ are those whose published descriptions are inadequate for their confident recognition if found elsewhere, or which correspond to existing mineral species or unnamed minerals published previously.
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Boetzkes, Amanda, e Jeff Diamanti. "Geofetishism and the Tender Violence of Rare Earths". SubStance 52, n.º 3 (2023): 9–30. http://dx.doi.org/10.1353/sub.2023.a913888.
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Abstract: This article addresses the geospeculation of Kuannersuit, a mountain in southwest Greenland that holds a major deposit of rare earth minerals, including uranium. Through the concepts of “geofetishism” and “tender violence,” we consider the history of mineral speculation in Greenland, and how its colonial history bears on the now independent (Inuit) Greenlandic government, and the township of Narsaq. With a focus on the anti-uranium activist group, Urani? Naamik! , we show the challenges posed to Greenlanders in their resistance to the mobilization of their mineral resources by the Australian mining company, Greenland Minerals and Energy (now renamed Energy Transition Minerals). A highlight of this resistance, in our view, is Urani Naamik’s counter-analysis of GME’s environmental assessment report.
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Ku, Lam Ian, Liza Forbes e Susana Brito e Abreu. "An Efficient Peptide Screening Method for Mineral-Binding Peptides". Minerals 14, n.º 2 (17 de fevereiro de 2024): 207. http://dx.doi.org/10.3390/min14020207.
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In mineral processing, arsenic-bearing minerals are particularly difficult to separate from their non-arsenic counterparts because they possess similar surface properties. Peptides are well known for their target specificity and can offer a ‘green’ alternative to traditional flotation reagents. However, the use of peptide technologies in mineral processing for developing novel flotation reagents has not been explored. Hence, this work aims to develop a screening method to identify mineral-binding peptides as potential reagent candidates. It is hypothesised that peptides can selectively adsorb onto mineral surfaces, and this method can efficiently identify mineral-binding peptides with high specificity toward the target minerals. The methodology presented involves a selection of peptide candidates from existing literature that show affinity toward arsenic species. These peptides were tested for their adsorption performance onto selected mineral surfaces to evaluate their mineral selectivity under flotation conditions. The study demonstrates that the screening method developed is effective in identifying peptides that have an affinity for target minerals, in this case, arsenic minerals. The screening method can be applied to other minerals, thus, unlocking the potential for developing new reagent chemistries for use in mineral processing.
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Sasongko, Nugroho Adi, Ulul Azmi, Sri Murtiana e Martin Anda. "Trend of critical minerals utilization for Indonesia’s Sustainable Energy Transition: A review". E3S Web of Conferences 513 (2024): 04004. http://dx.doi.org/10.1051/e3sconf/202451304004.
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The European Union calculates supplies of essential minerals using an economic significance index, a supply risk index and an environmental risk index. The U.S. Geological Survey uses three indicators to assess critical mineral risks in the country: foreign ownership of mineral assets and activities, trade dependence, and indirect trade dependence. Indonesia has a history of strong mineral production, and new prospects in the critical minerals sector are developing rapidly. Positioned as a major producer of nickel, the main component of lithium-ion batteries used in electric cars. This supports technological innovation that can improve infrastructure and support sustainable development, which is in line with SDG 9. Indonesia is increasing its capacity to produce other important minerals, such as rare earth elements and cobalt, in addition to nickel production. This research uses the literature study method. The aim is to review the development of essential minerals towards sustainable development.
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Setyaningtyas, Stefania Widya, Dominikus Raditya Atmaka, Qonita Rachmah, Nila Reswari Haryana, Mahmud Aditya Rifqi, Rian Diana, Aliffah Nurria Nastiti e Asri Meidyah Agustin. "The Role of Mineral and Synbiotic to Enhance Immunity During Covid-19 Pandemic : A Literature Review". Media Gizi Indonesia 18, n.º 3 (30 de setembro de 2023): 226–35. http://dx.doi.org/10.20473/mgi.v18i3.226-235.
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COVID-19 has become a pandemic in the last 3 years worldwide and cases cause high mortality and morbidity. To reduce COVID-19 infection, we need to keep our immune system healthy. Several nutrients have been shown to have specific abilities to increase the power of the immune system, but their use in the treatment of COVID-19 is still being debated. This review aims to determine the role of minerals and synbiotics in increasing immunity during the COVID-19 pandemic. Specific minerals such as zinc, selenium, iron and copper have promising potential to treat COVID-19 by reducing clinical impact, markers of inflammation, and improving immunological biomarkers. In addition to increasing mineral intake, maintaining a healthy immune system can also be done by improving the health of the gut microbiota. One of the therapies that is considered to have a positive impact on handling COVID-19 is using synbiotics (a combination of prebiotics and probiotics). However, the safety and efficacy of mineral and synbiotic supplementation in COVID-19 patients as adjunctive therapy still requires further research. Minerals and synbiotics can help boost the immune system and reduce symptoms during a COVID-19 infection.
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Agusdinata, Datu Buyung, Hallie Eakin e Wenjuan Liu. "Critical minerals for electric vehicles: a telecoupling review". Environmental Research Letters 17, n.º 1 (1 de janeiro de 2022): 013005. http://dx.doi.org/10.1088/1748-9326/ac4763.
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Abstract The rapid growth of electric vehicles adoption, which plays a crucial role to reduce transportation carbon emissions, is leading to a surge in demand for critical minerals such as cobalt, nickel, lithium, and rare earths. Efforts to systematically address the emerging sustainability issues associated with critical minerals have been challenged by complex mineral supply chains, and the distal and geographically dispersed nature of social-ecological impacts from mineral extraction and processing and eventual use. In this review, we apply a bibliometric analysis of the literature in the 2010–2020 period to analyze the state of research on the issues of critical mineral extraction impacts and the global governance responses. We use the concept of telecoupling to structure our literature search and analysis across four themes: (a) critical minerals global trade and supply chain, (b) sustainability and resource policy and governance, (c) mining corporate social responsibility, and (d) information feedback and public discourse. We find a growing attention to the social-ecological implications of critical mineral extraction, but also fragmentation among thematic domains that could impede progress towards more coordinated system governance. Based on the analyses, the paper concludes with a definition of some research and engagement opportunities around the telecoupling themes.
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Kuna, Anna, e Anna Katarzyna Wrońska. "Minerals and their role in the optimal functioning of the immune system – literature review". Polish Journal of Sports Medicine 39, n.º 3 (30 de setembro de 2023): 95–104. http://dx.doi.org/10.5604/01.3001.0053.8765.
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An adequate supply of minerals in the diet is crucial for the proper functioning of the immune system. This applies to both the mechanisms of innate and adaptive immunity, and in particular, the pro- and anti-inflammatory balance of the body. For most people, a balanced diet is sufficient to provide the body with adequate amounts of minerals. However, certain groups are particularly at risk of deficiencies in these nutrients. These include people who perform frequent and intense sports training when the body does not have an opportunity to regenerate properly. The aim of this paper was to discuss the role of minerals in the suitable functioning of the immune system. The following review of the latest literature focuses on the role of magnesium, zinc, iron and selenium as the components of greatest importance in immunology. The effects of a deficiency of these minerals and their impact on the maturation and function of immunocompetent cells, antibody production, cytokine production and immune pathways are discussed. The review was based on the available data collected in the PubMed database and in the Google Scholar search engine using the keywords: “the role of magnesium in the immune system”, “the role of zinc in the immune system”, “the role of iron in the immune system”, the role of selenium in the immune system”, “mineral deficiencies in athletes”, “impact of intense physical exercise on the immune system”.
Teses / dissertações sobre o assunto "Minerals in literature"
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Chiarelotto, Arivane Augusta. "Operações poéticas de Eugênio Montale". reponame:Repositório Institucional da UFSC, 2017. https://repositorio.ufsc.br/xmlui/handle/123456789/178324.
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Tese (doutorado)- Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Literatura, Florianópolis, 2017.Made available in DSpace on 2017-08-15T04:12:13Z (GMT). No. of bitstreams: 1 347202.pdf: 2005843 bytes, checksum: 037c4121cc9579da01845d3a37bdc1c6 (MD5) Previous issue date: 2017
Esta pesquisa aborda imagens que os minerais sólidos reverberam nos poemas de Ossi di seppia (Ossos de sépia), do italiano Eugenio Montale. Nosso estudo será focado em poemas escritos entre 1916 e 1927. O interregno indica que se trata de uma obra concebida e elaborada aos poucos, razão por que por algum tempo o autor considerou Ossi di seppia uma obra inacabada, ainda que já a tivesse publicado. O poeta, que nasceu em 1896, em Gênova, capital da Ligúria, nos tempos em que elaborava a obra vivia as confluências de uma transição cultural, que envolvia o ambiente da família, de tradições católico-burguesas, além da conjuntura política e cultural que compunha o cenário do pós-Grande Guerra. Os minerais, em grande evidência nesta obra, retratam o cenário natural lígure, compreendendo: mar, água, sal, pedras, rochas e cascalho. Geralmente, em razão de sua natureza rígida ou dura, os minerais sólidos, são analisados pela crítica sob a perspectiva metafórica, que os associa a obstáculos existenciais. Porém, Ossi di seppia compreende uma complexa rede de relações, pois, enquanto a época está para os grandes eventos, como a Primeira Guerra, Montale está para um mundo aparentemente insignificante, à sua volta, feito de formigas, passarinhos, mar, fendas das pedras, entre outros. Ele lhes concede voz, valendo-se das características imprevisíveis e irreverentes da natureza para questionar a inexorabilidade de determinados percursos. Levando-se em conta a concepção de arte do escritor, num momento em que as controvérsias históricas prenunciavam grandes mudanças culturais, como se poderiam interpretar as imagens dos minerais sólidos no texto poético montaliano? Nossa hipótese é de que os versos desta obra não podem ser tomados como simples expressão de uma existência angustiada, mas como manifestação particular de um poeta que reconhece o elemento que perdura, ou seja, o real conjugado à memória. Ao longo dos três capítulos deste trabalho, demonstraremos que os poemas confrontam, de forma particular, as convenções da representação na obra de arte. Muito mais do que operar por associação de sentidos e semelhanças, a abordagem contrabalança ideias opostas, evidenciando, ademais, os fragmentos e os objetos do cotidiano, enquanto modo de construir as contrametáforas. Os poemas, lidos sob a ótica da dialética, rompem com os esquemas lineares e expressam uma particular percepção da história. Comprovaremos as correlações entre concepções filosóficas e texto poético, operação que dá origem a uma arte poética que atualmente se pode denominar de poesia-pensamento.
Abstract : This research approaches images that the solid minerals reverberate on poems from Ossi di seppia (Cuttlefish Bones), by the italian Eugenio Montale. Our study will be focused on poems written from 1916 to 1927. The interregnum indicates that it was a work that was conceived and elaborated gradually, reason why the author considered Ossi di seppia an unfinished work, even if it was already published. The poet was born in 1896, in Genova, Ligúria?s capital, at the time he was elaborating the work, he was living the confluences of a cultural transition, that involved his family, which had catholic-bourgeois traditions, besides the political and cultural conjectures that painted the scenery post-Great War. The minerals, in great evidence in this work, portray the ligurian natural scenario, comprehending: sea, water, salt, stones, rocks and gravel. Usually, due to its hard and rigid nature, the solid minerals are analyzed by the critics under its metaphoric nature, that associates them with existential obstacles. However, Ossi di seppia comprehends a complex net of relations, because, while the time is for the great events, like the First World War, Montale?s time is for an apparently insignificant world around him, made of ants, birds, sea, slits in rocks, amongst other things. He gives them voice, backed by the unpredictable and irreverent characteristics of the nature, to question the inexorability of some trajectories. Taking in account the writer?s conception of art, in a moment where the historical controversies foreshadowed great cultural changes, how could the solid mineral images be interpreted in the montalian poetic text? Our hypothesis is that the verses of this work cannot be taken as a simple expression of an anguished existence, but as a particular manifestation of a poet that recognizes the enduring element, in other words, the real conjugate to the memory. Throughout the three chapters of this work, we will show that the poems confront, in a particular way, the conventions of the representations in artwork. Much more than operate by the association of senses and resemblances, the approach counterbalances opposite ideas, evidencing, moreover, the everyday fragments and objects, as a way of constructing the countermetaphores. The poems, read through the dialectic lenses, break with the linear plots and express a particular perception of history. We will show the correlations between philosophical conceptions and poetic text, operation which gives rise to what could be called nowadays of poetry-thought.
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Wilson, Michael George Carey. "A preliminary appraisal of the mineral potential of Venda based on a reconnaissance geochemical soil sampling survey and literature review". Thesis, Rhodes University, 1990. http://hdl.handle.net/10962/d1005606.
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A reconnaissance soil sampling survey was carried out over Venda by Cycad (Pty) Ltd and the samples were analysed for 36 elements using XRF techniques, by Anglo American Research Laboratories in Johanuesburg. The data resulting from this survey forms the basis for the present interpretive study. Initially the sample positions were co-ordinated, then the geological, soil and sample types were allocated to each point. Twelve lithological groupings were chosen which incorporated most of the available data, retained significant geological characteristics and consisted of statistically significant sample populations. Statistical manipulation was undertaken for each of the lithological groups. Using a final population of 5768 samples, means were determined and anomalous values were identified using a threshold of mean plus two standard deviations. Due to time and budgetary constraints, 24 of the 36 elements were chosen for statisical manipulation and fourteen of these, with particular economic significance, were chosen for plotting, wherever significant numbers of anomalies were present. The element overlays were plotted so as to coincide with 18 of the 25, 1:50 000 topographic sheets covering Venda , the remaining 7 having inadequate sample coverage to yield meaningful contours. In this way a total of 175 element overlay sheets were plotted, each showing contoured element levels, with selected anomalous values. The treatment of the vast body of information made available by the Cycad sampling programme has thus been selective and has continually been aimed at highlighting and concentrating attention on the areas of greatest indicated mineralization potential, rather than on specific anomalies. In this regard it is felt that the present study has been successful, in spite of limited sample coverage in some areas. Combining the results of this study with a modern tectonically-based appraisal of mineralization potential and a knowledge of the local geology and previously known mineralization gleaned from an extensive literature review, the following types of mineralization are considered to have the highest potential in Venda: i) Nickel-copper-platinum mineralization as well as magnesite, in the olivine dolerite sills which intrude the base of the Karoo Sequence in Northern Venda. ii) Coal in the basal Karoo Sequence sediments in a broad zone from Jazz 715 MS in the west, and along the Klein Tshipise fault from Amonda 159 MT to the Mutale Copper Fields then east of these to the Kruger National Park. Where intrusives invade these lower Karoo sed iments the potential exists for amorphous graphite. iii) Hydrothermal copper and possibly gold and silver concentrations, in Nzhelele and Sibasa Formation rocks, particularly those associated with faults known to have been active in post-Soutpansberg times. iv) Sediment-hosted massive sulphide deposits (Cu-Pb -Zn) close to basin margin faults, near intersections with cross cutting faults that have resulted in localized basin formation. These are most likely in the Soutpansberg sediments. v) Martle, flake-graphite and late stage skarn mineralization (including lead, zinc, gold and tungsten), in calcareous rocks of the Gumbu Formation.
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Johannesson, Kurt. "Mats Malm, Minervas äpple. Om diktsyn, tolkning och bildspråk inom nordisk göticism. Brutus Östlings Bokförlag Symposion, Stockholm/Stehag 1996". Uppsala universitet, Litteraturvetenskapliga institutionen, 1998. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-200914.
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Roux, Marius T. "The application of supplier collaboration to mining equipment purchasing strategies in order to improve the value added to operations : a literature review". Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/70659.
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Thesis (MBA)--Stellenbosch University, 2007.ENGLISH ABSTRACT: Purchasing strategies impact on the value added to operations by the items included in the specific purchasing strategy. In mechanised mining operations the mining equipment plays a significant role in the production process as it is the primary production tools. This study reviews literature on the application of buyer-supplier collaboration to purchasing strategies in order to improve the value added to operations and focus on mining equipment purchasing. Most authors agree that the origin of this type of relationship is the adoption of the production management concept of Just-in-Time. Models for buyer supplier collaboration include one dimensional models such as the Traditional and Advanced Supply Management model, Models on the automotive industry, and Supplier partnerships. The one dimensional models mainly compare traditional market type supplier relationships to advanced partnership or relational type relationships. The models reviewed also include multi-dimensional models such as the portfolio management models and the strategic supplier segmentation model. These multidimensional models propose the adoption of a variety of supplier management models based on certain contextual parameters relating to the purchase and expands on the one dimensional models. The benefits of buyer-supplier collaboration include reduced inventory, increased inventory turnover, reduced scrap, increased quality, reduced costs, improved delivery reliability, design and productivity, reductions in lead time, and additional effort from suppliers. The risks associated with buyer-supplier collaboration include significant resource requirements, lack of support from suppliers, shifting of inventory, industry type exclusivity, higher switching costs, and increase in supplier's power. Buyer-supplier collaboration has certain requirements to be successful. These include a fundamental change in the purchasing strategy relating to supplier selection criteria, number of sources and time horizon, multi-dimensional evaluations, a move to single-sourcing and long term relationships. The development of buyer-supplier collaboration is dependant on similarity in industry and technology, prior experiences change, effective communication and information sharing, and experiential learning. Other success factors include two-way information sharing, top management support, shared goals, early communication to suppliers of specification changes or new products, suppliers adding distinctive value, total quality management initiatives and Just-in-time initiatives. The models for buyer-supplier collaboration form the basis of most discussions on implementation. The main implementation guidelines reviewed include the implementation of operational links relating to design, logistics and quality. The more complete implementation models include the model for Five phases in the development and evolution of purchasing partnerships. The most complete models are the portfolio management models to supplier relationship management which includes contextual analysis as well as relationship analysis and implementation. Portfolio management models were found to be the most applicable to application in industries other than manufacturing. The final part of this study applies the theory to mining equipment purchases. The theory and application of buyer-supplier collaboration were developed for the manufacturing industry and therefore several issues arise in the application of these approaches in the mining industry. No significant literature was found relating to the application of buyer-supplier collaboration to mining equipment purchasing strategies. Applying the portfolio management approach to the mining equipment purchase and suppliers, reveals that mining equipment purchases are strategic in nature and buyer-supplier collaboration is the applicable management approach. Several areas of possible value add were identified and include acquisitions costs, replacement parts, efficiency and productivity of mining equipment. The initial review of the implementation of buyer-supplier collaboration at a mining operation reveals early performance improvements in terms of service levels. The review also indicates the existence of some of the risks associated with this type of relationship, mainly the shifting of inventory to the supplier.
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Pazder, Dobroslawa [Verfasser], e Robert [Akademischer Betreuer] Folger. "Sexo, muerte, minerales. Autocreación de Ramón Gómez de la Serna con referencia a lo freudiano / Dobroslawa Pazder ; Betreuer: Robert Folger". Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1234063832/34.
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Salazar, Espinoza David Elí. "Discursos del socavón: imágenes del universo subterráneo en la novela En la noche infinita". Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2004. https://hdl.handle.net/20.500.12672/2553.
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Discursos del socavón: imágenes del universo subterráneo en la novela En la noche infinita es el título tentativo que hemos denominado a esta tesis. En ella pretendemos abordar los discursos del texto divididos en seis capítulos. El primero trata de hacer una introducción al estudio desde el planteamiento de los problemas, la justificación de la investigación, perseguir algunos antecedentes hasta elaborar un panorama de la novela minera en el Perú que ubiquen el texto en estudio. El segundo capítulo trata de construir las estructuras primarias y básicas de la novela; desde el trama, sus actores, espacios hasta rastrear la vida de su autor. Así mismo tratamos de ubicar los sucesos históricos que marcaron la huella constructiva de la novela. Para ello, rastreamos las tres primeras décadas del siglo XX con detalles, ubicando los acontecimientos sociales que aparecen en los discursos de la obra. Estos datos están fuera del texto mismo, pero nos ayudan a comprender el texto en sí. Los cuatro últimos capítulos forman el estudio mismo de la novela. El tercer capítulo analiza los “discursos del socavón”, las imágenes que aparecen de ese universo subterráneo, siguiendo las pautas de la semiótica del discurso se asedia el texto del modo siguiente: el observador del universo subterráneo es un cuerpo sensible, sin tiente. Toma posición a través de dos operaciones: mira y captación. A través de la captación se extiende el relato. Nos damos cuenta que es un observador muy escrupuloso, atento a las circunstancias del trabajo cotidiano, ante sus ojos aparecen los distintos oficios de las minas que los mineros realizan con admirable destreza; y al mismo tiempo la mira del observador se torna muy sensible: sufre, llora, padece, se alegra y se emociona constantemente, como también aparecen los sujetos mágicos como el muqui y el jumpe dentro del escenario minero. El cuarto capítulo trata de elaborar un inventario de las metáforas más sobresalientes del texto, bajo la denominación de “metáforas de la vida cotidiana”, se hace un análisis de los discursos metafóricos de la novela.Tesis
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Aldana, Hidalgo Julio Xavier. "Conflicto minero y subalternidad en el Tungsteno de César Vallejo". Master's thesis, Pontificia Universidad Católica del Perú, 2015. http://tesis.pucp.edu.pe/repositorio/handle/123456789/6499.
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Este trabajo se propone analizar el discurso de una novela peruana representante del
realismo socialista y el indigenismo peruano que narra las relaciones de poder surgidas
dentro de un conflicto minero para demostrar que este discurso se construye a partir de
la configuración de dos tipos de subalternidad, una que es invisibilizada por las
relaciones de poder configuradas a partir de la violencia burocrática empresarial y
estatal, por medio de la cual el subalterno será representado como aculturado,
despojado, explotado, violentado, deshumanizado y objeto de goce; y otra donde
funciona como potencia contrahegemónica por formularse como un ser humano social y
político capaz de exigir justicia y libertad; y como uno poseedor de sentimientos
reivindicatorios, tales como la recuperación de la moral cristiana y la venganza.Tesis
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Connolly, David E. "Problems of textual transmission in early German books on mining "Der Ursprung Gemeynner Berckrecht" and the Norwegian "Bergkordnung" /". Columbus, Ohio : Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1133283981.
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Montenegro, Taiana Soares Vieira. "Uso de Mineral Trioxide Aggregate (MTA) em odontopediaria: revisão de literatura". Master's thesis, 2017. http://hdl.handle.net/10284/6196.
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A cárie dentária é muito comum em crianças. Hoje em dia, preconizamos o uso de materiais que auxiliem a polpa dentária no processo reparativo natural, tendo, por isso, de ser o mais biocompatíveis possível. O objectivo deste trabalho é realizar uma pesquisa bibliográfica da literatura sobre o uso do Mineral Trioxide Aggregate em Odontopediatria, principalmente em pulpotomias, apicoformações e protecções pulpares, suas propriedades e compará-lo com outros medicamentos, como o formocresol, o hidróxido de cálcio e a Biodentine®. Métodos: Pesquisa bibliográfica nos bancos de dados como: Pubmed, B-on, Google Académico, Repositório Científico de Acesso Aberto de Portugal e Cielo. Concluiu-se que, por apresentar biocompatibilidade, propriedades favoráveis à reparação e à formação de tecido duro, o Mineral Trioxide Aggregate tem sido amplamente pesquisado e com resultados satisfatórios, sendo indicado nos tratamentos de pulpotomia, apicoformação e protecção pulpar.The dental caries is very common in children. Nowadays, we preconize the use of materials that help the reparative process of the pulp, so they need to be the more biocompatible as possible. The aim of this thesis is to carry out a recent literature review to analyse the applications of Mineral Trioxide Aggregate in primary teeth, especially in therapeutic possibilities as pulpotomy, pulp capping and apexification, its properties and to compare with other materials as formocresol, calcium hydroxide e Biodentine®. Methods: The literature research were performed in the data bases: Pubmed, B-on, Google Scholar, Repositório Científico de Acesso Aberto de Portugal e Cielo. Conclusions: In primary teeth the Mineral Trioxide Aggregate has been widely researched because of its biocompatibility, hard tissue formation and repairing properties with good results. It can be used in pulpotomies, apexifications and pulp cappings with a high success rate.
Livros sobre o assunto "Minerals in literature"
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Oxlade, Chris. Minerals. Chicago, IL: Raintree, 2016.
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Pellant, Chris. Minerals. Tunbridge Wells: Ticktock, 2008.
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Faulkner, Rebecca. Minerals. Oxford: Raintree, 2008.
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Pellant, Chris. Minerals. Pleasantville, NY: Gareth Stevens Pub., 2009.
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Miller-Schroeder, Patricia. Minerals. New York: AV2 by Weigl, 2011.
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Spilsbury, Louise. Minerals. Oxford: Raintree, 2012.
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Spilsbury, Richard. Minerals. Chicago, Ill: Heinemann Library, 2011.
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Spilsbury, Richard. Minerals. Chicago, Ill: Heinemann Library, 2011.
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Nelson, Maria. Earth's minerals. New York: Gareth Stevens Pub., 2014.
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Symes, R. F. Rocks & minerals. New York: DK Pub., 2004.
Encontre o texto completo da fonteCapítulos de livros sobre o assunto "Minerals in literature"
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Rizvi, Nayab Batool, e Saeed Ahmad Nagra. "Literature Review: Cardiovascular Disorders and Minerals". In Minerals and Lipids Profiles in Cardiovascular Disorders in South Asia, 13–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34249-3_3.
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Duckert, Lowell. "‘Minerals in Winter’: Robert Wittie’s Cold Treatment". In Early Modern Literature in History, 191–209. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66568-5_11.
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Alarie, Jonathan, László I. Kiss, Lukas Dion, Sébastien Guérard e Jean-François Bilodeau. "Fundamental Mass Transfer Correlations Based on Experimental and Literature Data". In The Minerals, Metals & Materials Series, 711–17. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-22532-1_94.
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Andrea, Broggi, e Tangstad Merete. "Condensation of SiO and CO in Silicon Production—A Literature Review". In The Minerals, Metals & Materials Series, 697–716. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95022-8_55.
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Rizvi, Nayab Batool, e Saeed Ahmad Nagra. "Literature Review: Cardiovascular Disorders and Lipid Profile". In Minerals and Lipids Profiles in Cardiovascular Disorders in South Asia, 45–66. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34249-3_4.
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Smith, Helen. "‘Walking, Talking Minerals’: Men and Metals in King Lear and Bussy d’Ambois". In Crossroads of Knowledge in Early Modern Literature, 31–54. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-51800-3_2.
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Altinsel, Yiğit, Yavuz Topkaya, Şerif Kaya e Bülent Şentürk. "Extraction of Scandium from Lateritic Nickel-Cobalt Ore Leach Solution by Ion Exchange: A Special Study and Literature Review on Previous Works". In The Minerals, Metals & Materials Series, 1545–53. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-72284-9_201.
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Mackay, Melanie. "Indigenous Mining". In Heavy Metal, 107–16. Cambridge, UK: Open Book Publishers, 2024. http://dx.doi.org/10.11647/obp.0373.11.
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Although dominant western narratives often imply otherwise, mining is not just a colonial idea or activity. First Nations have been mining and quarrying rocks and minerals for thousands of years, using the extracted materials for cultural, spiritual, medicinal, and practical purposes. The literature documenting the use of rocks and minerals by First Nations peoples has been produced by archaeologists, and very little is known about these activities within the context of mining engineering and geoscience. By documenting the knowledge, resource management and science behind First Nations use of rocks, minerals and mining, we can contribute to the decolonization of the mining sector, while also helping to drive much needed innovation. The mining industry is now evolving to focus more attention on smaller and lower grade deposits, reprocessing of waste, sourcing independent supplies of critical minerals, and Indigenous reconciliation. Continued advances in these areas, inspired from the lessons of First Nations mining, are needed to transition the industry on a path to social and environmental sustainability. Working with Indigenous peoples to incorporate Indigenous ways of knowing into mine design and reclamation could be the key to overcoming the challenges ahead.
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Quesnel, Benoît, Christophe Scheffer e Georges Beaudoin. "The Light Stable Isotope (Hydrogen, Boron, Carbon, Nitrogen, Oxygen, Silicon, Sulfur) Composition of Orogenic Gold Deposits". In Isotopes in Economic Geology, Metallogenesis and Exploration, 283–328. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_10.
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AbstractOrogenic gold deposits formed in various terranes of most ages since the Paleoarchean and generally consist of quartz veins hosted in shear zones formed at the ductile brittle transition under greenschist to lower amphibolite metamorphic conditions. Vein mineralogy is dominated by quartz with various amounts of silicates, carbonates, phyllosilicates, borates, tungstates, sulfides, and oxides. The isotopic composition of these minerals and fluid inclusions has been investigated since the 1960s to constrain the characteristics of orogenic fluid systems involved in the formation of gold deposits worldwide. This review is based on 8580 stable isotope analyses, including δ18O, δD, δ13C, δ34S δ15N, δ11B, and δ30Si values, from 5478 samples from 558 orogenic gold deposits reported in the literature from 1960 to 2010. This contribution describes the variability of the light stable isotopic systems as function of the minerals, the age of the deposits, their regional setting, and their country rocks. The temperature of isotopic equilibrium of orogenic gold veins is estimated from mineral pairs for oxygen and sulfur isotopes. Based on these temperatures, and on fractionation between mineral and fluid components (H2O, CO2 and H2S), the isotopic composition of fluids is estimated to better constrain the main parameters shared by most of auriferous orogenic fluid systems. Orogenic gold deposits display similar isotopic features through time, suggesting that fluid conditions and sources leading to the formation of orogenic gold deposits did not change significantly from the Archean to the Cenozoic. No consistent secular variations of mineral isotope composition for oxygen (−8.1‰ ≤ δ18O ≤ 33‰, n = 4011), hydrogen (−187‰ ≤ δD ≤ −4‰, n = 246), carbon (−26.7‰ ≤ δ13C ≤ 12.3‰, n = 1179), boron (−21.6‰ ≤ δ11B ≤ 9‰, n = 119), and silicon (−0.5‰ ≤ δ30Si ≤ 0.8‰, n = 33) are documented. Only nitrogen (1.6‰ ≤ δ15N ≤ 23.7‰, n = 258) and sulfide sulfur from deposits hosted in sedimentary rocks (−27.2‰ ≤ δ34S ≤ 25‰, n = 717) display secular variations. For nitrogen, the change in composition is interpreted to record the variation of δ15N values of sediments devolatilized during metamorphism. For sulfur, secular variations reflect incorporation of local sedimentary sulfur of ultimate seawater origin. No significant variation of temperature of vein formation is documented for orogenic gold deposits of different ages. Quartz-silicate, quartz-carbonate and sulfide-sulfide mineral pairs display consistent temperatures of 360 ± 76 °C (1σ; n = 332), in agreement with the more common greenschist facies hostrocks and fluid inclusion microthermometry. Fluid sources for orogenic gold deposits are complex but the isotopic systems (hydrogen, boron, carbon, nitrogen, oxygen, sulfur) are most consistent with contributions from metamorphic fluids released by devolatilization of igneous, volcano-sedimentary and/or sedimentary rocks. The contribution of magmatic water exsolved from magma during crystallization is not a necessary component, even if permissible in specific cases. Isotopic data arrays can be interpreted as the result of fluid mixing between a high T (~550 °C)—high δ18O (~10‰)—low δD (~−60‰) deep-seated (metamorphic) fluid reservoir and a low T (~200 °C)—low δ18O (~2‰)—high δD (~0‰) upper crustal fluid reservoir in a number of orogenic gold deposits. The origin of the upper crustal fluid is most likely sea- or meteoric water filling the host rock porosity, with a long history of water–rock isotope exchange. Mixing of deep-seated and upper crustal fluids also explains the large variation of tourmaline δ11B values from orogenic gold veins. Regional spatial variations of oxygen and hydrogen isotope compositions of deep-seated fluid reservoirs are documented between orogenic gold districts. This is the case for the Val-d’Or (Abitibi), Coolgardie and Kalgoorlie (Yilgarn) where the oxygen isotope composition of the deep-seated fluid end-member is 4‰ lower compared to that from the Timmins, Larder Lake, and Kirkland Lake districts (Abitibi). However, both mixing trends converge towards a common, low δ18O upper crustal fluid end-member. Such variations cannot be related to fluid buffering at the site of deposition and suggest provinciality of the fluid source. The contribution of meteoric water is mainly recorded by fluid inclusions from Mesozoic and Cenozoic age deposits, but micas are not systematically in isotopic equilibrium with fluid inclusions trapped in quartz from the same vein. This suggests late involvement of meteoric water unrelated to deposit formation. Yet, a number of deposits with low δD mica may record infiltration of meteoric water in orogenic gold deposits. Isotope exchange between mineralizing fluid and country rocks is documented for oxygen, carbon, sulfur and silicon isotopes. Large variations (> 10‰) of sulfide δ34S values at the deposit scale are likely related to evolving redox conditions of the mineralizing fluid during reaction with country rocks. Deposits hosted in sedimentary rocks show a shift to higher δ18O values as a result of fluid/rock oxygen exchange with the regional sedimentary country rocks.
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Vasset, Sophie. "Mineral Waters as a Treatment for Barrenness in Eighteenth-Century Britain". In Early Modern Literature in History, 211–29. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-66568-5_12.
Texto completo da fonteTrabalhos de conferências sobre o assunto "Minerals in literature"
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Samarkin, Yevgeniy, Murtada Aljawad, Abduljamiu Amao, Theis Sølling, Khalid Al-Ramadan, Sidqi Abu-Khamsin, Shirish Patil, Murtadha AlTammar e Khalid Alruwaili. "Hydraulic Fracture Conductivity Sustenance in Carbonate Formations Through Rock Strengthening by DAP Solution". In International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22496-ms.
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Abstract Hydraulic fracturing operations involve generating conductive pathways in low permeability formations to maximize hydrocarbons production. One of the main challenges is maintaining fracture conductivity under high closure stresses, especially in soft formations. However, long–term fracture conductivity can be sustained through fracture surface hardness improvement. This research targets the strengthening of carbonate rocks via the transformation of calcite into the harder hydroxyapatite mineral. In this study, limestone, chalk, and dolomite rock specimens were treated with 1M solution of diammonium phosphate (DAP) for 3 days at room temperature conditions. Rock samples’ hardness was measured by indentation (Brinell hardness) technique before/after the treatment to assess the strengthening effect of DAP. The changes in the mineralogy in treated samples were studied by SEM-EDS technique. The formation of phosphate minerals was achieved in treated samples, and they were clearly seen in the SEM images. The results have shown that both limestone and chalk samples reacted strongly with DAP solution, which was expressed in terms of rich abundance in newly formed minerals inside rock specimens. The reaction between dolomite and DAP solution was observed to be weak which resulted in generation of isolated phosphate minerals. The formed minerals were identified as hydroxyapatite (5 hardness in the Mohs scale) after comparing their morphology with other phosphate minerals reported in the literature. Treatment of the rocks by DAP solution resulted in improvement of their strength. The Brinell hardness of the chalk specimen was increased by 30% after the treatment, whereas in the case of the limestone sample, a 13% increment in hardness was achieved. The proposed carbonate rock strengthening technique can be applied in hydraulic fracturing It is intended to solve common soft formations problems (e.g., asperities failure, proppant embedment) causing acid/propped fractures’ conductivity reduction.
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Feldmann, Felix, Emad W. Al-Shalabi e Waleed AlAmeri. "Carbonate Mineral Effect on Surface Charge Change During Low-Salinity Imbibition". In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206013-ms.
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Abstract Low-salinity waterflooding is a relatively simple and cheap improved oil recovery technique in which the reservoir salinity is optimized to increase oil recovery. Multivalent ion enriched as well as diluted brines have shown promising potential to increase oil production over conventional waterflooding. While the literature generally acknowledges that low-salinity improves oil recovery, the physical mechanisms behind low-salinity effects are still controversial. Surface charge change refers to a low-salinity mechanism in which modified brine is believed to cause a re-equilibrium of the carbonate surface potential. As a result of surface charge change, the rock wettability alters towards a more water-wetting state. This experimental study combines zeta potential, spontaneous imbibition, and contact angle measurements to highlight the effect of carbonate minerals on surface charge change. Initially, zeta potential measurements were conducted to compare the impact of five carbonate minerals (Indiana Limestone, Edward Limestone, Reservoir Limestone, Austin Chalk, and Silurian Dolomite) and brine compositions (Formation-water, Sea-water, and Diluted-sea-water) on carbonate surface charge. Moreover, the impact of potential determining ions (calcium, magnesium, and sulfate) on the mineral surface charge was investigated. The effect of carbonate minerals on spontaneous oil recovery was investigated by comparing the spontaneous imbibition of Formation-water, Sea-water, and Diluted-sea-water into the five carbonate minerals. Moreover, the wettability alteration during the spontaneous imbibition tests was quantified by conducting contact angle measurements. The brine-mineral zeta potential measurements were positive for Formation-water, slightly negative for Sea-water, and strongly negative for Diluted-sea-water. While calcium and magnesium ions promoted stronger positive electrical potentials, sulfate ions caused a zeta potential reduction. The magnitude of surface charge change was significantly different for the five tested carbonate minerals. Under the presence of Diluted-sea-water, the zeta potential measurements of Indiana Limestone and Austin Chalk resulted in strong negative electrical potentials. Reservoir Limestone and Edward Limestone showed less negative zeta potentials, while Silurian Dolomite and Diluted-sea-water resulted in slightly negative zeta potential results. Compared to Formation-water, Sea-water, and particularly Diluted-sea-water caused significant spontaneous oil recovery. The high spontaneous oil recovery of Diluted-sea-water and Indiana Limestone and Austin Chalk correlated with strong negative brine-mineral zeta potentials. Moderate spontaneous oil recovery was observed for the slightly negative zeta potential Sea-water and limestone/chalks systems. The contact angle measurements showed oil-wet contact angles under the presence of Formation-water, while the introduction of Sea-water and Diluted-sea-water promoted stronger water-wet contact angles. This work is one of the very few studies that investigates the effect of carbonate rock mineralogy on surface charge change and spontaneous oil recovery.
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Tariq, Zeeshan, Muhammad Ali, Bicheng Yan, Shuyu Sun, Mohammad Khan, Nurudeen Yekeen e Hussein Hoteit. "Data-Driven Machine Learning Modeling of Mineral/CO2/Brine Wettability Prediction: Implications for CO2 Geo-Storage". In Middle East Oil, Gas and Geosciences Show. SPE, 2023. http://dx.doi.org/10.2118/213346-ms.
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Abstract CO2 wettability and the reservoir rock-fluid interfacial interactions are crucial parameters for successful CO2 geological sequestration. This study implemented the feed-forward neural network to model the wettability behavior in a ternary system of rock minerals (quartz and mica), CO2, and brine under different operating conditions. To gain higher accuracy of the machine learning models, a sufficient dataset was utilized that was recorded by conducting a large number of laboratory experiments under a realistic pressure range, 0 – 25 MPa and the temperatures range, 298 – 343 K. The mica substrates were used as a proxy for the caprock, and quartz substrates were used a proxy for the reservoir rock. Different graphical exploratory data analysis techniques, such as heatmaps, violin plots, and pairplots were used to analyze the experimental dataset. To improve the generalization capabilities of the machine learning models k-fold cross-validation method, and grid search optimization approaches were implemented. The machine learning models were trained to predict the receding and advancing contact angles of mineral/CO2/brine systems. Both statistical evaluation and graphical analyses were performed to show the reliability and performance of the developed models. The results showed that the implemented ML model accurately predicted the wettability behavior under various operating conditions. The training and testing average absolute percent relative errors (AAPE) and R2 of the FFNN model for mica and quartz were 0.981 and 0.972, respectively. The results confirm the accuracy performance of the ML algorithms. Finally, the investigation of feature importance indicated that pressure had the utmost influence on the contact angles of the minerals/CO2/brine system. The geological conditions profoundly affect rock minerals wetting characteristics, thus CO2 geo-storage capacities. The literature severely lacks advanced information and new methods for characterizing the wettability of mineral/CO2/brine systems at geo-storage conditions. Thus, the ML model's outcomes can be beneficial for precisely predicting the CO2 geo-storage capacities and containment security for the feasibility of large-scale geo-sequestration projects.
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Tariq, Zeeshan, Ertugrul Umut Yildirim, Bicheng Yan e Shuyu Sun. "Deep Learning Models for the Prediction of Mineral Dissolution and Precipitation During Geological Carbon Sequestration". In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212597-ms.
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Abstract In Geological Carbon Sequestration (GCS), mineralization is a secure carbon dioxide (CO2) trapping mechanism to prevent possible leakage at later stage of the GCS project. Modeling of the mineralization during GCS relies on numerical reservoir simulation, but the computational cost is prohibitively high due to the complex physical processes. Therefore, deep learning (DL) models can be used as a computationally cheaper and at the same time, reliable alternative to the conventional numerical simulators. In this work, we have developed a DL approach to effectively predict the dissolution and precipitation of various important minerals, including Anorthite, Kaolinite, and Calcite during CO2 injection into deep saline aquifers. We established a reservoir model to simulate the process of geological CO2 storage. About 750 simulations were performed in order to generate a comprehensive dataset for training DL models. Fourier Neural Operator (FNO) models were trained on the simulated dataset, which take the reservoir and well properties along with time information as input and predict the precipitation and dissolution of minerals in space and time scales. During the training process, root-mean-squared-error (RMSE) was chosen as the loss function to avoid overfitting. To gauge prediction performance, we applied the trained model to predict the concentrations of different mineral on the test dataset, which is 10% of the entire dataset, and two metrics, including the average absolute percentage error (AAPE) and the coefficient of determination (R2) were adopted. The R2 value was found to be around 0.95 for calcite model, 0.94 for Kaolinite model, and 0.93 for Anorthite model. The R2 was calculated for all trainable points from the predictions and ground truth. On the other hand, the average AAPE for all the mappings was calculated around 1%, which demonstrates that the trained model can effectively predict the temporal and spatial evolution of the mineral concentrations. The prediction CPU time (0.2 seconds/case) by the model is much lower than that of the physics-based reservoir simulator (3600 seconds/case). Therefore, the proposed method offers predictions as accurate as our physics-based reservoir simulations, while provides a huge saving of computation time. To the authors' best knowledge, prediction of the precipitation and dissolution of minerals in a supervised learning approach using the simulation data has not been studied before in the literature. The DL models developed in this study can serve as a computationally faster alternative to conventional numerical simulators to assess mineralization trapping in GCS projects especially for the mineral trapping mechanism.
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Alamooti, M., e S. Namie. "A Rock Physics Feasibility Study of the Geothermal Lodgepole Reservoir, North Dakota". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0319.
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ABSTRACT Geothermal energy extraction from the Earth's crust requires a thorough understanding of the mechanisms that enhance fluid flow in rocks. Geoscientists must evaluate the elements that regulate the development of permeability networks and the parameters that control rocks’ responses to stimulation procedures across various spatial and time scales. The Williston Basin is a major geological depression with complex stratigraphic sequences, and its rocks’ complex microstructures and mineral compositions make it challenging to assess effective moduli accurately. In addition, the Lodgepole Formation in the Williston Basin is a primary geothermal aquifer with low-salinity waters co-produced with oil and gas, which are often discarded as waste. This study aimed to develop a rock physics model of the Lodgepole formation, emphasizing its geomechanics and petrophysical features, and explore the connections to locate additional geothermal energy sources in the future. The study used several methods to estimate rock physics characteristics, including elastic modulus of minerals and rock pore shape and found that the intra-particle model matches the available data. INTRODUCTION The Lodgepole Formation, is the second deepest (Fig. 1) of the Williston Basin's four principal geothermal aquifers. The Formation has been identified as a potential source of low-salinity geothermal fluids co-produced with oil and gas. These fluids are often considered waste and are discarded by reinjection into the ground. However, North Dakota is now exploring harnessing geothermal waters to produce power. To evaluate the geothermal potential of the Lodgepole Formation, it is essential to understand the geomechanical and petrophysical features of the rocks in the Formation. Non-typical reservoir rocks, such as tight sandstones and shales, are known for their complex microstructures and mineral compositions, making it challenging to assess their effective moduli. Additionally, data from the literature may only sometimes be accurate since XRD data is only continuous at some levels, and the elastic modulus information for minerals can vary based on the study location.
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Klepo, Lejla, Jelena Ostojic, Olga Borota, Sabina Zero e Dusan Culum. "ADSORPTIVE REMOVAL OF GLYPHOSATE FROM AQUEOUS SOLUTION ONTO PYROPHYLLITE". In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/4.2/s18.02.
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Pyrophyllite was investigated in this study as a potential adsorbent for the removal of glyphosate, a common herbicide for the control of a wide variety of weeds. There are several publications in the literature that discuss how glyphosate interacts with clay minerals such as montmorillonite, kaolinite, and bentonite, but there is no information regarding the possibility of glyphosate removal from aqueous solution using pyrophyllite. In this study, the adsorption of glyphosate from water samples onto pyrophyllite, a mineral clay from the Parsovici, Konjic mine, was investigated. The ninhydrin reaction was used to spectrophotometrically quantify glyphosate. At 570 nm, the purple Ruhemman product's absorbance was determined. Adsorption capacity (qe), removal efficiency (R), and the partition coefficient are used to express the results (Kd). The outcomes demonstrated that distinct ionic species of glyphosate at different pHs cause the adsorption of glyphosate on pyrophyllite to be pH-dependent. The findings demonstrated that during different contact times, the basic medium can remove up to 75% of glyphosate. According to results from fitting isotherm models, the Freundlich model is slightly better fitted. According to the results of kinetic investigations, the pseudo-2nd order model is more suitable for this kind of adsorption.
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Zhang, Yiheng, Xuhai Tang, Jingjing Xu e Quansheng Liu. "Investigating the Minerals and Laboratory-Scale Property of Planetary Rocks Using AGBM". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0412.
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ABSTRACT The physical properties and mechanical behaviour of planetary rocks are critical parameters in the design of asteroid mining. Rock samples obtained by sample-return missions via spacecraft and meteorites collected in the earth are usually rare, fragmented and arbitrarily shaped. These samples are difficult to be processed into standard cylinders required by traditionally macroscale rock mechanics testing methods (e.g., MTS tests), leading to the use of microscale rock mechanics experiments to derive the macroscale Young's modulus of these samples. These microscale experiments have to then be upscaled to obtain macroscale values. The performances of three upscaling methods are considered, two are based on effective medium theory and the third is the computational method of accurate grain-based modeling (AGBM). These methods are compared in the context of granitic samples, and the errors these three methodologies are quantified. The AGBM is found to be the most accurate, and is subsequently extended to measure the mechanical properties of unconventional rock samples, Hammadah al Hamra 346 (HaH 346) asteroid meteorites. The microstructure, mineral composition and mechanical properties of rock-forming minerals and interphase in HaH 346 meteorites are measured using microscale rock mechanics experiment (micro-RME). Then, the macroscale Young's modulus of HaH 346 meteorites is upscaled and estimated using the validated AGBM method. The work is helpful for the characterization of the unconventional rock samples during asteroid mining. INTRODUCTION Asteroid mining involves the hypothetical exploration of materials from asteroids and other minor planets, including near-Earth objects. Metal-rich near-Earth asteroids provide the intriguing possibility that ferrum (Fe), nickel (Ni) and cobalt (Co) could someday be mined for use on Earth or in space (Hiroi et al., 1993). Therefore, understanding the deformation and failure properties of planetary rocks is critical to optimize construction activities beyond Earth (Gibney, 2018). The properties of asteroid rocks, such as composition, thermal parameters and magnetic properties, have been measured and are available in the literature (Flynn et al., 2018; Gattacceca et al., 2014; Krot et al., 2009; Ostrowski and Bryson, 2019). However, the strength measurements of asteroid rocks are scarce, mainly due to the destructive nature of traditional macroscale rock mechanics experiments (macro-RME). The physical properties of stony meteorites, including mechanical properties such as strength, provide important clues to understand the formation and physical evolution of material in the solar protoplanetary disk (Flynn et al., 2018; Pohl and Britt, 2020). However, asteroid samples (e.g. meteorites) are usually arbitrarily-shaped making it difficult to produce standard specimens (Shao et al., 2020) that are required by macro-RME. Recently, the microscale Rock Mechanics Experiment (micro-RME) and Accurate Grain-Based Models (AGBM) have been developed to investigate the mechanical properties of rock-forming minerals of arbitrarily-shaped rocks and their macroscale mechanical properties (Xu et al., 2020; Tang et al. 2022).
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Radulescu, Laura, Patricia Tarkanyi, Corina Iuliana Megyesi, Ariana Bianca Velciov e Despina-Maria Bordean. "STUDIES REGARDING BIOACTIVE FINGERPRINT OF CAULIFLOWER VERSUS BROCCOLI". In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023v/6.2/s25.46.
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This study aims to determine the specific fingerprints of cauliflower and broccoli available on the Romanian market based on mathematical models and chemical analysis (moisture content, minerals content, total antioxidant capacity and total polyphenols content). These vegetables (cauliflower and broccoli) are considered essential for the human diet due to their bioactive content and nutritional value. The content of minerals and antioxidant compounds varies depending on their varieties, environmental conditions, ripening stage, collecting and storage methods. The studied vegetables are high in essential micronutrients copper (Cu), iron (Fe), zinc (Zn), manganese (Mn), nutrients which are associated with enzymatic activities. Research shows that eating cruciferous vegetables brings many health benefits due to their active sulfur and nitrogen-containing compounds. The obtained results were compared to literature and database data and the graphical fingerprint were created. The generalized linear model was applied for analyzed vegetables, cauliflower and broccoli samples and the correspondence equation were obtained. The Mantel correlogram was used to test the hypothesis that innovative food products and or diets can be created based on the nutritional content of the vegetables and the nutritional needs of the consumer.
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Al-Khdheeawi, Emad A., Cut Aja Fauziah, Doaa Saleh Mahdi e Ahmed Barifcani. "A New Approach To Improve The Assessments of CO2 Geo-Sequestration Capacity of Clay Minerals". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21278-ms.
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Abstract CO2 geological storage (CCS)isconsidered as the most promising technique to reduce atmospheric CO2emissions. However, due to the density variation between the injected supercritical CO2 and the formation water,CO2 tends to move vertically toward the air. This vertical CO2 leakage can be prevented by four trapping mechanisms (i.e. structural trapping,capillary trapping, solubility trapping, and mineral trapping). The capacities of structural and residual trapping are highly affected by rock wettability. Clay wettability is one of the crucial parametersin evaluation of CO2 geo-sequestration. However, the literature data show that there are many uncertainties associated with experimental measurements. One of these uncertainties is the influenceof the effect of gas density on the clay mineral wettability. Thus, here, we compared the wettability of a clay mineral (i.e. illite) of three different gas densities scenarios (i.e. low (Helium), moderate (Nitrogen), and high (CO2) gas densities). To do so, we measured the advancing and receding contact angle (i.e. wettability) of illite for CO2/water, nitrogen/water, and Helium/water systems at a constant (333 K) and four different pressures (5, 10, 15, and 20 MPa). The brine composition used was 4 wt% NaCl, 4 wt% CaCl2, 1 wt% MgCl2 and 1 wt% KCl, for all gas density scenarios. The results indicate that gas density has a significant effect on the clay mineral wettability and that both advancing and receding contact angles increase with an increase in gas density. The results show that a higher density gas scenario has a higher contact angle of illite, measured at the same temperature and pressure. For instance, the advancing contact angle of illite at 333 K and 20 MPa was 65° for the CO2/water system, 53° for the nitrogen/water system, and 50° for Helium/water Helium/water system. Thus, we conclude that the gas density affects the Clay wettability measurement and that the higher gas density leads to a higher contact angle measurements (i.e. a more CO2-wet system) of the clay and thus reduces the estimated CO2 geo-sequestration capacity and containment security.
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Zhang, Tiansheng, e Haiying Huang. "Physical Properties and Fracture Network Characteristics of Mafic and Ultramafic Rocks". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0951.
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ABSTRACT Mineral carbon storage in mafic and ultramafic rocks is a novel concept for CO2 sequestration. In contrast to carbon sequestration in sedimentary formations, where structural and residual trappings are the primary mechanisms of storage, solubility and mineral trappings are expected to be the dominant storage mechanisms in mafic and ultramafic rocks. Mafic and ultramafic rocks are rich in calcium, magnesium and iron. Mineral carbonation occurs when these rocks are exposed to an environment with CO2 and water. Feasibility of mineral carbon storage has been demonstrated in field trials in Iceland and eastern Washington state. In this work, we conduct a comprehensive literature review on the properties of mafic and ultramafic rocks such as basalt, gabbro and peridotite. We examine the ranges of material properties and their correlations as well as rock mass characteristics and their implications in terms of carbon sequestration. Comprehensive knowledge of intact rocks and rock mass properties will be essential for research and development of carbon storage in these rocks. INTRODUCTION Mineral carbon storage in mafic and ultramafic rocks is a novel concept for CO2 sequestration. In contrast to carbon sequestration in sandstone formations, where structural and residual trappings are the primary mechanisms of storage, solubility and mineral trappings are expected to be the dominant storage mechanisms in mafic and ultramafic rocks. Mafic and ultramafic rocks are rich in calcium, magnesium and iron. Mineral carbonation occurs when these rocks are exposed to an environment with CO2 and water. Pilot field studies have been previously conducted - the Wallula Project in eastern Washington state (McGrail et al., 2017) and the CarbFix and CarbFix2 Project in southwest Iceland (Matter et al., 2016; Clark et al., 2020; Ratouis et al., 2022). These projects aimed at capturing CO2 permanently through mineral carbonation in basalt. Nearly 1,000 tons of supercritical CO2 were injected over a three-week period in summer 2013 in the Wallula Project. Two permeable basalt interflow reservoir zones with a combined thickness about 20 m within a layered basalt sequence at a depth of 830 − 890 m below the surface were chosen as the target zone. Field monitoring and characterization were carried out over a two-year period post injection. Isotope analysis of carbonate minerals from side-wall cores sampled post injection showed isotopic signatures of injected CO2. Presence of free-phase CO2 was detected from wireline logging at the top of the two injection interflow zones, likely due to buoyancy driven flow. But no vertical migration of CO2 above the injection zones was observed. These evidences suggest that storage and rapid mineralization of CO2 in a suitable basalt formation are feasible.
Relatórios de organizações sobre o assunto "Minerals in literature"
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Pittenger, Robert, e Terry West. Effects of Salt and Trace Minerals for Bituminous Pavement Literature Review, Information Gathering, and Research Plan Development. West Lafayette, IN: Purdue University, 1995. http://dx.doi.org/10.5703/1288284313201.
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Price, Roz. Taxation and Public Financial Management of Mining Revenue in the Democratic Republic of Congo. Institute of Development Studies (IDS), outubro de 2021. http://dx.doi.org/10.19088/k4d.2021.144.
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This rapid review provides a summary of the evidence on the taxation and public financial management of mining revenues in the Democratic Republic of Congo (DRC). This is a very complex topic, with a large and growing literature base, a huge interest by donors, non-governmental organisations and businesses, with some conflicting information at times. In particular, specific data on provincial budgets and spending was not identified during this review. No specific information on public financial management in either of these provinces was identified during the course of this review. Given the burgeoning size of the literature base and the complexity of the mining sector in the DRC, this rapid review only provides a snapshot of the literature. It draws on academic, grey and donor literature sources. Some papers for further reading are highlighted. The report first provides a brief background discussion of general taxation in the DRC, the decentralisation process, and provincial public revenue management. The next section provides general information on the mining sector in the DRC, including the regulatory system and official duties, royalties and tax provisions. Section 4 goes into more detail about taxation and rent-seeking in the mining sector, touching on both large-scale mining (LSM) and artisanal and small-scale mining (ASM). The next section looks at smuggling of minerals in the DRC, with a focus on gold. Finally, some specific lessons learned were drawn from two World Bank projects and highlighted in the final section. Lessons and experiences from other mining-related projects are also highlighted throughout the report. Literature in French was not included in this rapid review, which may mean that some key documents were omitted.
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Rahmé, Marianne, e Alex Walsh. Corruption Challenges and Responses in the Democratic Republic of Congo. Institute of Development Studies, janeiro de 2022. http://dx.doi.org/10.19088/k4d.2022.093.
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The Democratic Republic of the Congo (DRC) consistently scores in the lowest rungs of global indexes on corruption, integrity and wider governance standards. Indeed, corruption of different sorts pervades public and corporate life, with strong ramifications for human development. Although the DRC is one of the richest countries in the world in terms of natural resources, its people are among the globe’s poorest.Corruption in the extractive industries (minerals and oil) is particularly problematic in terms of scale and its centrality to a political economy that maintains elites and preserves the highly inequitable outcomes for the majority. The politico-economic elites of the DRC, such as former President Joseph Kabila, are reportedly significant perpetrators but multinationals seeking valuable minerals or offering financial services are also allegedly deeply involved. Corruption is therefore a problem with national and international roots.Despite national and international initiatives, levels of corruption have proven very stubborn for at least the last 20 years, for various reasons. It is a structural and not just a legal issue. It is deeply entrenched in the country’s political economy and is driven both by domestic clientelism and the fact that multinationals buy into corrupt deals. This rapid review therefore seeks to find out the Corruption challenges and responses in the Democratic Republic of Congo.Grand level corruption shades down into the meso-level, where for instance, mineral laden trucks are systematically under-weighted with the collusion of state officials. With severe shortfalls in public funding, certain public services, such as education, are supported by informal payments. Other instances of petty corruption facilitate daily access to goods and services. At this level, there are arguments against counting such practices as forms of corruption and instead as necessary survival practices.To address the challenge of corruption, the DRC is equipped with a legal system that is of mixed strengths and an institutional arsenal that has made limited progress. International programming in integrity and anti-corruption represents a significant proportion of support to the DRC but much less than humanitarian and governance sectors. The leading international partners in this regard are the EU, US, UNDP, UK, African Development Bank, Germany and Sweden. These partners conduct integrity programming in general governance issues, as well as in the mineral and forest sectors.The sources used in this rapid review are gender blind and converge on a very negative picture The literature ranges from the academic and practitioner to the journalistic and investigative, and taken as a whole, is of good quality, drawing on different types of evidence including perceptions and qualitative in-country research. The sources are mostly in English with two in French.
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Stout, D. L., e S. A. Carroll. A literature review of actinide-carbonate mineral interactions. Office of Scientific and Technical Information (OSTI), outubro de 1993. http://dx.doi.org/10.2172/10106323.
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West, Chris, Rhian Ebrey, Joe Simpson, Emilie Stokeld, Frida Lager, Simon Croft, Francesco Bosello et al. Report on preliminary impact and policy insights from model and sectoral case study analysis: trade-linked cross-border impacts. Stockholm Environment Institute, janeiro de 2023. http://dx.doi.org/10.55317/casc025.
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Trade-linked cross-border climate impacts have the potential to severely disrupt the European economy. Yet, the research landscape that surrounds these potential impacts remains in a relatively nascent stage. Importantly, whilst quantitative approaches can be applied in isolation to develop our understanding of cascading cross-border impacts, these should ideally be supplemented by the broader development of knowledge as to how initial climate triggers might evolve via trade systems, might interact with the actions and activities of supply chain actors, and how the wider policy landscape might act as an enabler or barrier to EU climate resilience. The objective of this deliverable is to provide a set of preliminary policy insights resulting from a summary and synthesis of outputs from WP3 of the CASCADES project. Outputs of WP3 encompass the quantitative results of models applied to the exploration of the impacts of climate change on EU trade-linked systems, and qualitative analysis of stakeholder viewpoints – supplemented by information from the wider literature – which highlights key climate-linked concerns, potential responses, and interactions with policy. The deliverable is divided below into three main sections. The first provides a synthesis and related policy implications based on a summary of the outcomes of research activities conducted in CASCADES WP3. Then, the remainder of the report is divided into discrete summaries of the analysis conducted. Analysis Section 1 summarises the quantitative outcomes of WP3 models. Analysis Section 2 summarises the qualitative components of WP3 within the form of three focal trade-linked case studies: a) food systems, b) the soy supply chain, c) energy transition minerals. The depth and breadth of these three case studies differs (more explanation on scope of coverage and methods applied can be found in Analysis Section 2). The Deliverable overall is intended to act as a starting point for (for food systems and soy supply chains) a more in-depth exploration of the policy environment that surrounds trade-linked cross-border impacts that will link to WP6 of the CASCADES project.
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Lichter, Amnon, David Obenland, Nirit Bernstein, Jennifer Hashim e Joseph Smilanick. The role of potassium in quality of grapes after harvest. United States Department of Agriculture, outubro de 2015. http://dx.doi.org/10.32747/2015.7597914.bard.
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Objectives: The objectives of the proposal were to study how potassium (K) enters the berry and in what tissues it accumulates, to determine what is the sensitive phenological stage that is responsive to K, to study the influence of K on sugar translocation, to determine if K has effects on expression of genes in source and sink organs and to study applied aspects of the responses to K at the vineyard level. During the research it was realized that K acts externally so a major part of the original objectives had to be deserted and new ones, i.e. the role of K in enhancing water loss from the berry, had to be developed. In addition, the US partners developed practical objectives of understanding the interaction of K application and water deficit as well as application of growth regulators. Background: In our preliminary data we showed that application of K at mid-ripening enhanced sugar accumulation of table grapes. This finding is of major implications to both early and late harvested grapes and it was essential to understand the mode of action of this treatment. Our major hypothesis was that K enters the berry and by that increases sugar translocation into the berry. In addition it was important to cover practical issues of the application which may influence its efficacy and its reproducibility. Conclusions: The major conclusion from the research was that our initial hypothesis was wrong. Mineral analysis of pulp tissue indicated that upon application of K there was a significant increase in most of the major minerals. Subsequently, we developed a new hypothesis that K acts by increasing the water loss from the berry. In vitro studies of K-treated berries corroborated this hypothesis showing greater weight-loss of treated berries. This was not necessarily expressed in the vineyard as in some experiments berry weight remained unchanged, suggesting that the vine compensated for the enhanced water loss. Importantly, we also discovered that the efficacy of different K salts was strongly correlated to the pH of the salt solution: basic K salts had better efficacy than neutral or acidic salts and modifying the pH of the same salt changed its efficacy. It was therefore suggested that K changes the properties of the cuticle making it more susceptible to water loss. Of the practical aspects it was found that application of K to the clusters was sufficient to trigger its affect and that dual application of K had a stronger effect than single application. With regard to timing, it was realized that application of K after veraison was affective and the berries responded also when ripe. While the effect of K application was significant at harvest, it was mostly insignificant one week after application, suggesting that prolonged exposure to K was required. Implications: The scientific implications of the study are that the external mineral composition of the berry may have a significant role in sugar accumulation and that water loss may have an important role in sugar accumulation in grapes. It is not entirely clear how K modulates the cuticle but according to the literature its incorporation into the cuticle may increase its polarity and facilitate generation of "water bridges" between the flesh and the environment. The practical implications of this study are very significant because realizing the mode of action of K can facilitate a much more efficient application strategy. For example, it can be understood that sprays must be directed to the clusters rather than the whole vines and it can be predicted that the length of exposure is important. Also, by increasing the pH of simple K salts, the efficacy of the treatment can be enhanced, saving in the costs of the treatment. Finally, the ability of grape growers to apply K in a safe and knowledgeable way can have significant impact on the length of the season of early grape cultivars and improve the flavor of high grape yields which may otherwise have compromised sugar levels.
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Walsh, Alex, e Ben Hassine. Mediation and Peacebuilding in Tunisia: Actors and Practice. Institute of Development Studies (IDS), abril de 2021. http://dx.doi.org/10.19088/k4d.2021.061.
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This Helpdesk Report is part mapping of the mediation and peacebuilding actors in Tunisia and part review of the available literature. There are a host of governmental and non-governmental organisations (NGOs) that are involved in the mediation of conflicts and peacebuilding, both in formal and informal ways. There is overlap in the principles and goals of peacebuilding and mediation; many organisations conduct both practices, intermingling them. Local, regional, national and international actors have applied mediation and peacebuilding to many different types of conflict in the past decade in Tunisia, involving varied parties. The case studies included in this rapid review cover conflicts relating to labour and the economy, the environment, basic services, constitutional/political disputes, and women’s rights. They involve local communities, the unemployed national and regional trade unions, civil society organisations (CSOs), national utility and mineral companies, and political parties.
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LeGrand, Sandra, Christopher Polashenski, Theodore Letcher, Glenn Creighton, Steven Peckham e Jeffrey Cetola. The AFWA dust emission scheme for the GOCART aerosol model in WRF-Chem v3.8.1. Engineer Research and Development Center (U.S.), agosto de 2021. http://dx.doi.org/10.21079/11681/41560.
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Airborne particles of mineral dust play a key role in Earth’s climate system and affect human activities around the globe. The numerical weather modeling community has undertaken considerable efforts to accurately forecast these dust emissions. Here, for the first time in the literature, we thoroughly describe and document the Air Force Weather Agency (AFWA) dust emission scheme for the Georgia Institute of Technology–Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) aerosol model within the Weather Research and Forecasting model with chemistry (WRF-Chem) and compare it to the other dust emission schemes available in WRF-Chem. The AFWA dust emission scheme addresses some shortcomings experienced by the earlier GOCART-WRF scheme. Improved model physics are designed to better handle emission of fine dust particles by representing saltation bombardment. WRF-Chem model performance with the AFWA scheme is evaluated against observations of dust emission in southwest Asia and compared to emissions predicted by the other schemes built into the WRF-Chem GOCART model. Results highlight the relative strengths of the available schemes, indicate the reasons for disagreement, and demonstrate the need for improved soil source data.
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Mercier-Langevin, P., R. A. Creaser, J. Goutier e I. Kjarsgaard. Rhenium-rich molybdenite and Re-Os age of the Archean porphyry-style Don Rouyn deposit, Abitibi greenstone belt, Rouyn-Noranda, Québec. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332556.
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This report presents Re-Os dating of molybdenite from the Don Rouyn deposit and St. Jude breccia prospect in the Rouyn-Noranda mining district in the southern Abitibi greenstone belt, Quebec. Both have been described as porphyry-style, magmatic-hydrothermal Cu-(Au-Mo) deposits associated with the Flavrian and Powell subvolcanic plutons based on the nature of the mineralized zones, their setting and available U-Pb age constraints. To further constrain the timing of mineralization, molybdenite was sampled at both sites for Re-Os geochronology. Although the analyzed sample from the St. Jude prospect did not yield a realistic age, a molybdenite mineral separate sample from the Don Rouyn deposit yielded a reliable age of 2689 ± 11 Ma. Interestingly, the Don Rouyn molybdenite is distinguished by extremely high Re content (>5200 ppm Re) that compares with that of the world's richest porphyry deposits. Based on the Re-Os age obtained in this study and limited descriptions of the deposit available in the literature, the Don Rouyn deposit is most likely associated with the emplacement of the Flavrian-Powell intrusive complex at ~2700 Ma, as suggested in previous studies. However, a younger timing of emplacement, comparable to other ca. 2682-2680 sub-alkaline to alkaline magmatic-hydrothermal Cu-(Au-Mo) deposits in the southern part of Blake River Group, although less likely, cannot be entirely ruled out based on the available constraints and the molybdenite Re- Os age presented here.
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Influence of Salinity on the Resources and Uses of Great Salt Lake. Utah Geological Survey, outubro de 2021. http://dx.doi.org/10.34191/ofr-736.
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The salinity of Great Salt Lake (GSL) plays a very influential role in shaping the lake’s unique ecological, recreational, and mineral resource uses. This memorandum summarizes a review of the literature and GSL databases to describe critical salinity ranges that influence these resources and uses. It presents a GSL Salinity Matrix intended to provide decision-makers with an important illustration; not to predict how GSL’s salinity will change, but to illustrate the potential consequences of salinity changes.