Um die anderen Arten von Veröffentlichungen zu diesem Thema anzuzeigen, folgen Sie diesem Link: Mines and mineral resources – Valuation.
Dissertationen zum Thema „Mines and mineral resources – Valuation“
Geben Sie eine Quelle nach APA, MLA, Chicago, Harvard und anderen Zitierweisen an
Machen Sie sich mit Top-50 Dissertationen für die Forschung zum Thema "Mines and mineral resources – Valuation" bekannt.
Neben jedem Werk im Literaturverzeichnis ist die Option "Zur Bibliographie hinzufügen" verfügbar. Nutzen Sie sie, wird Ihre bibliographische Angabe des gewählten Werkes nach der nötigen Zitierweise (APA, MLA, Harvard, Chicago, Vancouver usw.) automatisch gestaltet.
Sie können auch den vollen Text der wissenschaftlichen Publikation im PDF-Format herunterladen und eine Online-Annotation der Arbeit lesen, wenn die relevanten Parameter in den Metadaten verfügbar sind.
Sehen Sie die Dissertationen für verschiedene Spezialgebieten durch und erstellen Sie Ihre Bibliographie auf korrekte Weise.
1
ROBERTS, MARK CULMER. „THEORY AND PRACTICE OF THE INTENSITY OF USE METHOD OF MINERAL CONSUMPTION FORECASTING (MINERAL, ECONOMICS)“. Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/187962.
Der volle Inhalt der QuelleAnnotation:
The intensity of use of a mineral is traditionally defined as the consumption (production plus net imports) of the mineral divided by gross national product. It has been proposed that this ratio of raw material input to gross economic output is a predictable function of per capita income and that the relationship is based on economic theory. Though the theory has never been clearly defined, the intensity of use method has been used to make long term forecasts. This dissertation formulates a theoretical model of the consumption of minerals and the resulting intensity of use which is used to test the validity of the traditional intensity of use measure and its forecasting ability. Previous justifications of the intensity of use hypothesis state that changes in technical efficiency, substitution rates among inputs, and demands are explained by per capita income, which, as it grows, produces a regular intensity of use pattern. The model developed in this research shows that the life of the goods in use, foreign trade of raw and final goods, prices, consumer preferences, technical innovations, as well as the above factors fully explain economic use, which is not simply a function of per capita income. The complete model is used to restate the traditional theory of intensity of use and to examine the sensitivity of traditional measures to changes in the explanatory variables which are commonly omitted. The full model demonstrates the parameters that must be examined when making a long term forecast. Regular intensity of use patterns are observed for many minerals in many nations. Setting aside the theoretical questions, the intensity of use method is often used to make long term projections based on these trends in intensity of use as well as the trends in population and gross national product. This dissertation examines the forecasting ability of the traditional intensity of use method and finds that it is not necessarily an improvement over naive consumption time trend forecasts. Furthermore, it is unstable for very long term projections.
2
Cai, Wenlong. „ZERO-ONE PROGRAMMING ANALYSIS OF MINE PRODUCTION SCHEDULING PROBLEMS“. Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275401.
Der volle Inhalt der Quelle
3
Webber, R. C. W. „Determining the physical and economic impact of environmental design criteria for ultra-deep mines“. Pretoria : [s.n.], 2006. http://upetd.up.ac.za/thesis/available/etd-07242006-105847/.
Der volle Inhalt der Quelle
4
King, Nelson Eng. „A DECISION SUPPORT SYSTEM FOR MINE EVALUATIONS“. Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275287.
Der volle Inhalt der Quelle
5
Gottschalk, Ethan Jermome. „Resource Debate in Southwest Alaska: The Bristol Bay Fishery and the Pebble Mine“. The University of Montana, 2010. http://etd.lib.umt.edu/theses/available/etd-01222010-112628/.
Der volle Inhalt der QuelleAnnotation:
Bristol Bay, in Southwest Alaska, is the largest sockeye salmon fishery in the world. After an almost total collapse of salmon numbers in the mid 1970s, the salmon have returned and average in the tens of millions every year. The salmon play a vital economic, cultural, and subsistence role in the lives of the people who call Bristol Bay home. At present there is a plan to develop a low-grade, but substantial, mineral deposit that consists primarily of copper, gold, and molybdenum. The estimated value of the minerals present is more than $500 billion. This plan is known as the Pebble Project, and could involve an open-pit mine, a large area of block caving, as well as the creation of huge tailings ponds north of Lake Iliamna. The proposed site of the mine straddles a drainage divide that affects two major watersheds that feed the Bristol Bay fishery. A resource debate is at hand which places the development of the mineral deposit at odds with the health of the fishery.
6
Fountaine, ELise V. „Computer aided underground mine design and drafting package“. Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182785891.
Der volle Inhalt der Quelle
7
Lavoie, Sébastien. „Géologie de la mine East-Sullivan, Abitibi-Est, Val-d'or, Québec /“. Thèse, Chicoutimi : Université du Québec à Chicoutimi, 2003. http://theses.uqac.ca.
Der volle Inhalt der Quelle
8
Scheppele, Ryan Hall. „Wingbeat modulation detection of honey bees using a continuous wave laser system“. Thesis, Montana State University, 2006. http://etd.lib.montana.edu/etd/2006/scheppele/ScheppeleR0806.pdf.
Der volle Inhalt der Quelle
9
Li, Zhongxue. „Determining the size and life of underground coal mines“. Diss., This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-10022008-063243/.
Der volle Inhalt der Quelle
10
Pan, Guocheng. „Concepts and methods of multivariate information synthesis for mineral resources estimation“. Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184946.
Der volle Inhalt der QuelleAnnotation:
This study introduces a new methodology referred to as geoinformation synthesis for multivariate evaluation of mineral resources and integration of diverse geoscience data. The most critical component is the development of the notion of intrinsic samples and the methods for their delineation. Intrinsic samples replace grid cells which are conventionally employed as the basic information reference. Grid cell sampling has imposed several serious limitations on the geoscience and genetic information that can be objectively related to mineral endowment. Methods based upon intrinsic samples moderate to a certain extent these problems and bring the critical genetic information into the geoscience information system which forms the basis for the quantitative evaluation of mineral resources. The second major component in this new methodology is the integration of factors describing exploration effects with other geodata and mineral endowment estimation; this combination effectively reduces the possibilities of biases in the estimates of mineral endowment and recoverable resources due to the incomplete knowledge on the control area and imperfect analogy with the study areas. The third component is the use in the qualitative models of synthesized geoinformation, which is considerably enhanced, instead of using directly the original measurements (geodata). Several multivariate techniques are proposed and employed for synthesis of diverse information and estimation of mineral endowment, including a priori weighted multivariate criterion, optimum discretization, coherency analysis, multidimensional scaling method (p(ijk), filtering analysis, and geochemical transportation models. These methods were developed, tested, and demonstrated on an actual case study of the epithermal gold-silver deposits in the Walker Lake quadrangle of Nevada and California using various data sets available for this region: geochemical, structural, gravity and magnetic, lithology, and alteration. Finally, the estimation of endowment in terms of epithermal gold-silver mineral occurrences is given for some selected intrinsic samples or information zones identified in the Walker Lake region.
11
Altamirano, Nelson. „Essays on mining countries : Dutch disease, development and copper markets /“. Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC IP addresses, 2000. http://wwwlib.umi.com/cr/ucsd/fullcit?p9975891.
Der volle Inhalt der Quelle
12
Lau, Ian Christopher. „Regolith-landform and mineralogical mapping of the White Dam Prospect, eastern Olary Domain, South Australia, using integrated remote sensing and spectral techniques“. Title page, abstract and table of contents only, 2004. http://hdl.handle.net/2440/37972.
Der volle Inhalt der QuelleAnnotation:
The research contained within this thesis was directed at examining the spectral properties of regolith-dominated terrains using airborne and proximal hyperspectral instruments. The focus of the investigation was to identify the mineralogy of the regolith and determine if surficial materials were indicative of the underlying bedrock in the regolithdominated terrain of the eastern Olary Domain, South Australia. The research area was constrained to a 250 km2 area around the Cu-Au mineralisation of the White Dam Prosect. Integrated remote sensing, using airborne hyperspectral datasets (HyMap), Landsat imagery and gamma-ray spectroscopy data, was performed to map regolith-landforms and extract information on surficial materials. Detailed calibration of the HyMap dataset, using a modified model-based/empirical line calibration technique, was required prior to information extraction. The White Dam area was able to be divided into: alluvial regolith-dominated; in situ regolith-dominated; and bedrock-dominated terrains, based on mineralogical interpretations of the regolith, using the remotely sensed hyperspectral data. Alluvial regions were characterised by large abundances of vegetation and soils with a hematite-rich mineralogy. Highly weathered areas of in situ material were discriminated by the presence of goethite and kaolinite of various crystallinities, whereas the bedrock-dominated regions displayed white mica-/muscovite-rich mineralogy. Areas flanking bedrock exposures commonly consisted of shallow muscovite-rich soils containing regolith carbonate accumulations. Traditional mineral mapping processes were performed on the HyMap data and were able to extract endmembers of regolith and other surficial materials. The Mixture Tuned Matched Filter un-mixing process was successful at classifying regolith materials and minerals. Spectral indices performed on masked data were effective at identifying the key regolith mineralogical features of the HyMap imagery and proved less time consuming than un-mixing processes. Processed HyMap imagery was able to identify weathering halos, highlighted in mineralogical changes, around bedrock exposures. Proximal spectral measurements and XRD analyses of samples collected from the White Dam Prospect were used to create detailed mineralogical dispersion maps of the surface and costean sections. Regolith materials of the logged sections were found to correlate with the spectrally-derived mineral dispersion profiles. The HyLogger drill core scanning instrument was used to examine the mineralogy of the fresh bedrock, which contrasted with the weathering-derived near-surface regolith materials. The overall outcomes of the thesis showed that hyperspectral techniques were useful for charactering the mineralogy of surficial materials and mapping regolith-landforms.Thesis (Ph.D.)--School of Earth & Environmental Sciences, 2004.
13
Yu, Zhanjing. „A study of building response and damage due to mining-induced ground movements“. Diss., This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-07112007-092849/.
Der volle Inhalt der Quelle
14
Walter, Timothy George. „METALS DISTRIBUTION AT THE SAN ANTONIO MINE, SANTA EULALIA MINING DISTRICT, CHIHUAHUA, MEXICO“. Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275296.
Der volle Inhalt der Quelle
15
Carter, E. J. „Flow of power law fluids with application to oil drilling“. Thesis, University of Plymouth, 1986. http://hdl.handle.net/10026.1/458.
Der volle Inhalt der QuelleAnnotation:
The thesis is concerned with a theoretical study of the flow behaviour of inelastic power law fluids in two different types of flow situation. These are: 1. The creeping motion of a sphere moving through an expanse of liquid. 2. The combined steady and oscillatory flow of a liquid through a straight tube of circular cross section. The first part of the work is devoted to the prediction of the drag correction factor for a sphere falling slowly through a bounded inelastic power law fluid. The analysis is carried out for the case when the outer spherical boundary has a finite or infinite radius. A perturbation technique is used to produce the resulting equations for a slightly power law fluid which are solved using the finite element method. An asymptotic expansion is used to provide an analytical far field solution for the infinite outer sphere case. The second part considers the combined steady and oscillatory flow of an inelastic power law liquid in a tube. The analysis is carried. out for the case when both the steady flow rate and the oscillatory flow rate are known. An expression for the pressure gradient reduction in the tube is then derived. The resulting partial differential equation is solved by finite difference techniques. An analytical solution for the pressure gradient is also obtained using a perturbation analysis for the case when the fluid inertial effects are small.
16
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.
Der volle Inhalt der QuelleAnnotation:
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.
17
McGill, Jeannette Elizabeth. „Technical risk assessment techniques in mineral resources management with special reference to the junior and small-scale mining sectors“. Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-02092006-124915.
Der volle Inhalt der Quelle
18
Crane-Engel, Melinda. „The political economy of multilateral technical assistance : a case study of United Nations mineral exploration projects“. Thesis, Connect to Dissertations & Theses @ Tufts University, 1987.
Den vollen Inhalt der Quelle findenAnnotation:
Thesis (Ph.D) -- Fletcher School of Law and Diplomacy, 1987.Typescript. Vita. Bibliography: leaves 471-492. Access restricted to members of the Tufts University community. Also available via the World Wide Web;
19
Wa, Ku Mikishi Lenge E. „Economic justice and mineral exploitation in the Democratic Republic of Congo: A biblical and ethical approach“. Thesis, Boston College, 2013. http://hdl.handle.net/2345/bc-ir:105016.
Der volle Inhalt der QuelleAnnotation:
Thesis advisor: David HollenbachThesis advisor: Andrea Vicini
Thesis (STL) — Boston College, 2013
Submitted to: Boston College. School of Theology and Ministry
Discipline: Sacred Theology
20
Coolbaugh, Mark Franklin. „GEOLOGY AND ECONOMIC MINERAL POTENTIAL OF UPPER BROWNS CREEK BASIN, CHAFFEE COUNTY, COLORADO“. Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275257.
Der volle Inhalt der Quelle
21
Bainton, Nicholas Alexander. „Virtuous sociality and other fantasies pursuing mining, capital and cultural continuity in Lihir, Papua New Guinea /“. Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00003343.
Der volle Inhalt der Quelle
22
Matthews, Robert Reese. „The Antaractic treaty : alternative resource management policies for off-shore hydrocarbon exploitation“. Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/28880.
Der volle Inhalt der Quelle
23
Smith, Jessica L. K. „A land of plenty Depression-era mining and landscape capital in the Mojave Desert, California /“. abstract and full text PDF (free order & download UNR users only), 2006. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3209959.
Der volle Inhalt der Quelle
24
Steele, George Benjamin. „Metallogenesis and hydrothermal alteration at Cerro Rico, Bolivia“. Thesis, University of Aberdeen, 1996. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=195758.
Der volle Inhalt der QuelleAnnotation:
Cerro Rico is the world's largest silver deposit. Hypogene mineralisation is hosted by a sheeted, polymetallic vein system which cross-cuts a pervasively altered rhyodacite dome. The 13.8Ma dome was intruded along a regional dextral strike-slip fault. Subsequent movement focused stress within the dome, creating a closely-spaced fracture system, best described as an extensional duplex. Hydrothermal alteration shows features characteristic of both porphyry and epithermal deposits. Shallow acid-sulphate alteration, comprising sub-horizontal zones of advanced argillic alteration and residual vuggy silica, formed through the neutralisation of a supergene, acid-sulphate fluid derived from the atmospheric oxidation of hypogene H2S. Deep sericitisation which largely pre-dates the polymetallic vein mineralisation is the product of wall-rock reaction with magmatically-derived volatiles. Localised tourmalinisation resulted from the violent release of boron-rich fluids during early decompression events. A buried magma body is implied for the source of volatiles. Polymetallic vein mineralisation is vertically and laterally zoned from deep Sn-W-Bi-As-Cu assemblages to peripheral Pb-Zn-Sb-Ag. Hypogene silver occurs within complex Pb-Sb sulphosalts, tetrahedrite (freibergite), pyrargyrite and argentite. Mixing of reduced, near-neutral, hypogene Ag-bearing fluids and oxidised, supergene, acid-sulphate fluids caused the precipitation of 'bonanza' silver mineralisation within the acid-sulphate lithocap. Early pre-mineral fluids were hypersaline (34wt. %NaCl equivalent). Main stage ore fluids varied in temperature between 140 and 410°C with salinities averaging 11wt.% NaCl equivalent. Stable isotope data are consistent with a magmatic source both for the ore fluid and sulphur. Following collapse of the hydrothermal system, a fall in the palaeo-water table caused deep oxidation. Silver was released from hypogene sulphosalts and re-precipitated as disseminated acanthite and silver halides. Hypogene Ag2S remained stable in the weathering environment. The oxide zone, preserved by a semi-arid climate, currently constitutes a world-class silver orebody.
25
Marcy, Norman Karl. „British Columbia parks and mines in conflict : an evaluation of resolution processes“. Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24858.
Der volle Inhalt der QuelleAnnotation:
The purpose of this thesis is to evaluate alternative processes for resolving conflicts between mineral development, and park preservation interests in British Columbia. The peculiarities and variation within the generic conflict illustrate the divergence between two main interest groups, and the representative provincial resource agencies. A brief examination of eight cases demonstrates the conflict is manifest with different intensities, over a wide time range, and with geographic variety. By comparing the supposed weakness of the litigation model and the claimed advantages of the bargaining model for processing of conflict to resolution, five criteria for efficiency are developed: time and delay; cost; capacity for technical issues; opportunity for participation; and flexibility of outcomes. Examples of conflict dialogue illustrate cognitive, value, interest and behavioral conflict in the parks / mines situation with the aim that the reader and the researcher can have a communality of experience and tools for understanding in assessing the detailed case evidence. Detailed examination of the Wells Gray Provincial Park case and Chilko Lake Wilderness Park Proposal illustrate strong British Columbia examples of both litigation and bargaining models under the same time and political circumstance. Not all of the allegations of strength or weakness are substantiated in either case. The promise demonstrated in the unstructured version of bargaining found in the Chilko example may be improved through innovation and commitment.Applied Science, Faculty of
Community and Regional Planning (SCARP), School of
Graduate
26
Park, Sang-Jeong. „Investigation of factors influencing the determination of discount rate in the economic evaluation of mineral development projects“. Diss., Pretoria : [s.n.], 2009. http://upetd.up.ac.za/thesis/available/etd-11292009-082936/.
Der volle Inhalt der Quelle
27
Peplow, Dan. „The influence of mine waste contamination on invertebrates and fish in the Methow River Valley, Okanogan County, Washington (U.S.A.) /“. Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/5519.
Der volle Inhalt der Quelle
28
Kille, J. Dee. „United by gold and glory : the making of mining culture in Goldfield, Nevada, 1906-1908 /“. abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3311916.
Der volle Inhalt der QuelleAnnotation:
Thesis (Ph. D.)--University of Nevada, Reno, 2008."May 2008." Includes bibliographical references (leaves 457-464). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
29
Lang, James Robert 1961. „A GEOCHEMICAL STUDY OF ALTERATION AND MINERALIZATION IN THE WALLAPAI MINING DISTRICT, MOHAVE COUNTY, ARIZONA (MINERAL PARK, FLUID INCLUSIONS, SULFUR ISOTOPES)“. Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/275536.
Der volle Inhalt der Quelle
30
Arnonkitpanich, Atchariya. „Strategies for maximizing the social benefit from the exploitation of gypsum mineral resource of Thailand“. Thesis, University of Stirling, 2009. http://hdl.handle.net/1893/2019.
Der volle Inhalt der QuelleAnnotation:
The study begins by investigating Thailand’s administration of its mineral resources and those of some other leading mineral-exporting countries for comparison. The notion of ‘resource curse’, which affects many resource-rich countries, and an analysis how Thailand fought and won the ‘curse’ is critically explored. The principle of sustainable development and its implication to Thailand are presented, together with various computed indicators of sustainable development for Thailand. The role of mineral resources and Hotelling’s model in the context of sustainable development are discussed. The essence of this study is the development of economic models to determine the optimal extraction paths of Thailand’s gypsum resources based on Hotelling's concept of maximizing Net Present Value (NPV) of benefits accrued to the country. This study finds that under all assumptions and all scenarios, at a certain point in time, Thailand should stop exporting its gypsum and devote the remainder of its gypsum resources to domestic consumption only. In addition, Thailand should push gypsum price up to a certain level. The model determining gypsum consumption in Thailand and some countries imported gypsum from Thailand, which are the basis to determine the optimal extraction paths of gypsum in Thailand, is also developed. It shows that the price of gypsum had no effect on its consumption. In other words, the demand for gypsum might be highly inelastic. Finally, the long-term policies for Thailand to manage its gypsum resource are recommended.
31
Klein, Katherine. „Electromagnetic properties of high specific surface minerals“. Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/20699.
Der volle Inhalt der Quelle
32
Hopper, Derek J. „Crustal evolution of paleo- to mesoproterozoic rocks in the Peake and Denison Ranges, South Australia /“. [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18288.pdf.
Der volle Inhalt der Quelle
33
Boucher, Alexandre. „Conditional joint simulation of random fields on block-support /“. St. Lucia, Qld, 2003. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe17169.pdf.
Der volle Inhalt der Quelle
34
Cook, Steven Allen. „Characterization of riparian wetland soils and associated metal concentrations at the headwaters of the Stillwater River, Montana“. Thesis, Montana State University, 2007. http://etd.lib.montana.edu/etd/2007/cook/CookS0507.pdf.
Der volle Inhalt der Quelle
35
Rutter, Anthony Paul. „A study of factors affecting the regeneration of mineral exploration sites in the semi-arid and arid areas of South Western South Australia /“. Title page, table of contents and abstract only, 2002. http://web4.library.adelaide.edu.au/theses/09ENV/09envr982.pdf.
Der volle Inhalt der Quelle
36
Cai, Wenlong. „Application of network flow and zero-one programming to open pit mine design problems“. Diss., The University of Arizona, 1989. http://hdl.handle.net/10150/184797.
Der volle Inhalt der QuelleAnnotation:
An algorithm which adopts a moving cone approach but is guided by maximal network flow principles is developed. This study argues that from a network flow point of view, the re-allocation problem is a major obstacle to prevent a simulation oriented pit design algorithm from reaching the optimum solution. A simulation oriented pit design algorithm can not resolve the re-allocation problem entirely without explicit definition of predecessors and successors. In order to preserve the advantages of moving cone algorithm and to improve the moving cone algorithm, the new algorithm trys to avoid the re-allocation situations. Theoretical proof indicates that the new algorithm can consistently generate higher profit than the popular moving cone algorithm. A case study indicates that the new algorithm improved over the moving cone algorithm (1% more profit). Also, the difference between the new algorithm and the rigorous Lerchs-Grossmann algorithm in terms of generated profit is very insignificant (0.015% less). The new algorithm is only 2.08 times slower than the extremely fast moving cone algorithm. This study also presents a multi-period 0-1 programming mine sequencing model. Once pushbacks are generated and the materials between a series of cutoffs are available for each bench of every pushback, the model can quickly answer, period by period, what is the best (maximum or minimum) that can be expected on any one of these four items: mineral contents, ore tonnages, waste tonnages and stripping ratios. This answer is based on a selected cutoff and considers the production capacity defined by the ore tonnage, the desired stripping ratio and the precedence constraints among benches and pushbacks. The maximization of mineral contents is suggested to be the direct mine sequencing objective when it is permissible. Suggestions also are provided on how to reduce the number of decision variables and how to reduce the number of precedence constraints. A case study reveals that the model is fast and operational. The maximization of mineral contents increases the average grades in early planning periods.
37
Ledwell, Paul H. „A synthesis of form, color, and content in relief sculpture“. Virtual Press, 1989. http://liblink.bsu.edu/uhtbin/catkey/724972.
Der volle Inhalt der QuelleAnnotation:
The successful combination of form, color, and content prior to the relief construction movement in the 1960's was usually associated with two-dimensional artwork. The problem, then was whether the artist could successfully combine form, color, and content in three-dimensional sculpture pieces.The content of the work described relates to the artist's personal experiences as an underground uranium miner through the medium of relief sculpture. The successful combination of form, color, and content conveyed the artist's mining experiences to a neophyte audience. The visual variety and motif in the work, however, will not be lost on any members of the audience who are also sculptors.The methods used by the artist included textbook research and studio experimentation to produce a series of pieces which would address the successful combination of form, color, and content. The research also included a study of other artists' use of shape and color in the relief sculpture format. The artist's findings were documented in the form of a thesis paper and also eight relief sculpture pieces which employed a combination of wood and paint. The paint was applied to the wood structure using a heavy impasto technique which completely obscures the wood and allows the artist to manipulate both form and color. The texture invites the viewer to explore the surface and shapes without consciously sorting out what materials are used in the construction of the sculpture.Department of Art
38
Brown, Derek Anthony. „Geological setting of the volcanic-hosted Silbak Premier Mine, northwestern British Columbia, (104 A/4, B/1)“. Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26174.
Der volle Inhalt der QuelleAnnotation:
Detailed mapping of a 7.5 km² area at 1: 2,500 and a 1:10,000 compilation map over 60 km² have established Hazelton Group stratigraphy and structure. Hazelton Group stratigraphy begins with at least 1,000 metres of Late Triassic-Early Jurassic (210 ⁺²⁴₋₁₄ Ma; U-Pb zircon) green andesite flows, breccias
and tuffs. Less than 1750 metres of green and maroon andesitic to dacitic volcaniclastic rocks overlie the andesite unit. North of Silbak Premier, at Slate Mountain, the volcaniclastic unit is overlain by up to 200 metres of a black tuff unit containing characteristic fresh biotite and white plagioclase fragments. The top of the Hazelton is a regional marker horizon, the Monitor rhyolite breccia and tuff (197 ± 14 Ma; zircon U-Pb). Hazelton volcanics are overlain by three different units. At Slate Mountain the Bowser Lake Group Bathonian/Callovian argillite and siltstone (at least 1500 m thick) lie above Hazelton rocks. Farther north on Mount Dilworth, Monitor rhyolite is succeded by black tuff or a Toarcian buff carbonate. East of Monitor Lake, less than 75 metres of Bajocian Spatsizi Group silicic shale and tuff overlies Hazelton volcanic rocks.
Three intrusive episodes are discerned through isotopic dating: Early Jurassic (190 ± 2 Ma; U-Pb zircon) Texas Creek plutonic suite dacitic porphyries; Eocene Hyder suite leucocratic dykes; and oligocene-Miocene (25.2 ± 2.3 Ma; K-Ar biotite and 18 ± 6 Ma; Rb-Sr) biotite lamprophyre dykes. The Jurassic suite includes K-feldspar megacrystic "Premier porphyry" sills and dykes that are in part spatially and possibly genetically associated with mineralization.
Structural features include disharmonic tight folds, ductile shear zones, and brittle faults. At least 4 phases of pre-Eocene deformation are defined by: (1) moderate west-plunging recumbent folds, (2) north-plunging inclined folds, (3) north-plunging upright folds, and (4) moderate west-plunging pencil lineations. The map area is divisible into three structural domains: the North, East and Silbak domains. The North domain is characterized by a marked structural discordance between warped Hazelton volcanic rocks and disharmonically folded Bowser Lake Group argillite and siltstone. Three phases of folding are: first phase tight to isoclinal disharmonic, recumbent folds; second phase open folds with shallow northwest-dipping axial planar cleavage; and a third phase upright, shallow north-plunging synclinorium. Structural continuity is difficult to establish due to lack of marker horizons and inferred detachments. The East domain is characterized by phase 3 gently north-northwest-plunging folds and locally east-verging asymmetric chevron folds in the Spatsizi Group. In contrast to North domain, Monitor rhyolite and/or Spatsizi Group are structurally conformable with Bowser Lake Group rxks. The Silbak domain is characterized by phase 4 pencil lineations and quartz veins. Stope geometry illustrates that mineralization occurs along two trends (1) northeast zone and (2) northwest zone of unknown phase.
Steeply dipping, east-striking ductile fabrics occur in the Texas Creek batholith at the Riverside mine, Alaska and in maroon volcaniclastics along Bear River Ridge. Mylonitic fabrics at Riverside mine suggest a dextral sense of shear. A biotite lineation in the mylonitic foliation yields a totally reset Eocene K-Ar date.
The width of Eocene Hyder dyke swarms indicates that there has been at least one kilometre of northeast brittle crustal extension. About 1400 metres of dextral transcurrent movement along the Long Lake-Fish Creek fault is post-Eocene dyke emplacement. oligocene-Miocene lamprophyre dykes fill fractures produced during east-west extension.
Regional syntectonic greenschist grade metamorphism produced a carbonate-chlorite-sericite-pyrite mineral assemblage, probably in Middle Cretaceous time, bracketed by isotopic dating results.
Hazelton Group volcanic rocks and coeval Texas Creek porphyritic rocks are subalkaline high-K to very high-K andesites and dacites. Tectonic discrimination diagrams indicate a calcalkaline, volcanic arc setting, with similar geochemical patterns to those for Andean volcanic rocks. Mineralization is hosted in Hazelton Group andesites and coeval Texas Creek porphyritic dacite sills and dykes. Mineralization and porphyry emplacement appear to have been controlled by northeast- and northwest-striking structures. Ore is predominantly discordant but locally concordant with moderately northwest-dipping andesite flows and breccias. No mineralization occurs in or above overlying maroon volcaniclastic rocks. Sericite alteration gives a Paleocene K-Ar date (63 ± 5 Ma); this is interpreted to be partially reset. The spatial link with Texas Creek K-feldspar porphyry and discordant nature of the ore suggests mineralization is Early Jurassic age and supports an epigenetic model.Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
39
McDonald, Bruce Walter Robert. „Geology and genesis of the Mount Skukum tertiary epithermal gold-silver vein deposit, southwestern Yukon Territory (NTS 105D SW)“. Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26448.
Der volle Inhalt der QuelleAnnotation:
The Tertiary Mt. Skukum gold - silver epithermal vein deposit occurs 65 km southwest of Whitehorse in the Yukon Territory. Veins are hosted by a sequence of nearly flat-lying Eocene Skukum Group andesitic volcanic rocks of the Mt. Skukum Volcanic Complex, part of the Sloko Volcanic Province which unconformably overlies these intrusive complexes as well as metamorphic rocks of the Yukon Group.
Major known mineralized zones occur within a regional halo of propylitic alteration centered on a fault-bounded graben within Main Cirque in the southwestern corner of the Mt. Skukum Volcanic Complex. Each zone consists of steeply-dipping quartz-carbonate-sericite veins associated with major faults and rhyolite dykes which bound blocks of the graben.
Precious metals occur as electrum and native silver as fine grains averaging 15 to 20 microns and locaIly exceeding 1 mm across, in veins containing only trace amounts of sulphides. Fluid inclusions indicate that vein minerals were deposited from hydrothermal fluids averaging 313°C with an average salinity of 0.7 weight percent NaCl equivalent. Primary inclusions show that depositional fluids existed under two pressure regimes; one close to hydrostatic, the other approaching lithostatic. Both reflect depths of deposition of about 470 m below paleosurface. Variable fluid pressures reflecting similar depths of deposition combined with variable liquid to vapour ratios in primary inclusions as well as abundant textural evidence of hydrothermal brecciation indicate that boiling was common during mineralization.
Oxygen and carbon isotope composition of minerals in the deposit and surrounding wall rocks indicate that depositional fluids were meteoric in origin with no contribution from magmatic sources. Large depletions in 0¹⁸ content of andesitic rocks in the deposit area indicate a minimum water rock ratio over the life of the deposit of 0.81:1. Precious metals at the Mt. Skukum deposit were emplaced at relatively low temperature in a near surface environment by a circulating, meteoric water dominated, hydrothermal system driven by a heat source associated with the rhyolite dykes. Gold, leached from andesitic volcanic rocks and metamorphic and granitic rocks was precipitated with quartz and carbonate in permeable conduits such as fault zones, and breccia bodies.Science, Faculty of
Earth, Ocean and Atmospheric Sciences, Department of
Graduate
40
Kemp, Deanna Louise. „Between a rock and a hard place : community relations work in the minerals industry /“. [St. Lucia, Qld.], 2005. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe19336.pdf.
Der volle Inhalt der Quelle
41
Mkubukeli, Zandisile. „Challenges and prospects for small-scale mining entrepreneurs in South Africa“. Thesis, Cape Peninsula University of Technology, 2016. http://hdl.handle.net/20.500.11838/2047.
Der volle Inhalt der QuelleAnnotation:
Thesis (MTech (Business Administration))--Cape Peninsula University of Technology, 2016.Small-scale mining entrepreneurs are confronted with a variety of challenges during both the start-up and growth phase of their businesses not only in South Africa, but all over the world. Most small-scale mining entrepreneurs are not able to take advantage of the opportunities that are available to them. This retards the growth of their businesses. The aim of this study was to investigate the challenges and prospects for small-scale mining entrepreneurs in South Africa, the support structures available to them as well as the factors that could make them successful. The research problem in this study is that the mining sector is biased towards more established companies and against small-scale mining entrepreneurial operations, which marginalises small-scale mining entrepreneurs. Despite being a significant source of revenue for South Africa, the mining sector does not directly benefit the historically disadvantaged people. Notwithstanding government interventions, small-scale mining entrepreneurs face numerous challenges during both the business start-up and growth phase of their businesses with very few prospects of succeeding. This is a qualitative study that uses a series of face-to-face interviews with mining entrepreneurs in South Africa to generate data. Given that small-scale mining entrepreneurs are in most cases part of the informal sector and difficult to locate, a database of small-scale mining entrepreneurs was obtained from Mintek. Initially, 21 small-scale mining entrepreneurs were randomly selected to participate in this study. However, it soon became apparent that ten of them were no longer in business. This meant that the sample was reduced to eleven mining entrepreneurs, located in four provinces: Free State, KZN, Mpumalanga and Limpopo. The findings of this research reveal that small-scale mining entrepreneurs are handicapped by a lack of financial and technical resources, and therefore cannot purchase capital items. It seems that there are good prospects for small-scale mining, particularly in open markets. However, they are unable to exploit these prospects because they lack the necessary finance. Although there are support structures to assist them, they find it difficult to meet the criteria for loans or overdraft facilities from financial institutions. Although these mining entrepreneurs have benefited from the support they have received thus far, they need equipment and commitment to their businesses to remain successful. A series of recommendations are made to guide small-scale mining entrepreneurs already in business, prospective small-scale mining entrepreneurs and other stakeholder’s interested in transforming the industry.
Zandisile Holdings (Pty) Ltd National Research Foundation Mauerberger Foundation
42
Mchaina, David Mhina. „Studies into the application of controlled recirculation ventilation in Canadian underground mines“. Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/31000.
Der volle Inhalt der QuelleAnnotation:
Increasing energy costs and the need to conserve energy compounded with low mineral prices have prompted some Canadian mines especially potash producers, to examine their operations and identify potential saving methods. Re-using or recirculating a fraction of ventilating air may enable these mines to reduce winter heating costs.
Gas and dust concentrations were monitored in the intake and exhaust airways to assess the potential for recirculating exhaust air. The results indicate that the mine pollutant concentrations in potash mines are low and stable. Trial recirculation experiments returning 20 - 47% exhaust air into the fresh air airway did not cause significant increases in mixed intake pollutant levels. Two types of recirculation systems - namely variable and fixed quantity - are developed. Detailed designs of recirculation systems for Central Canada Potash of Noranda Minerals Inc. and Rocanville Division, Potash Corporation of Saskatchewan are discussed and recommendations made for the selection and positioning of on-line monitoring, control and telemetry systems. A controlled recirculation system conceptual design for the H-W mine is given.
The economic payback periods for systems proposed for Rocanville Division and CCP are 2 and 3 years respectively. Recirculation percentages of 30%, 64.4% and 23% are feasible for CCP, Rocanville Division and the H-W mine.
The recirculation percentages for the proposed systems were determined using Air Quality Index criteria.
Dust deposition studies conducted at CCP in return airways indicate that 65% of dust by weight is deposited within a distance of 550 metres from the face. In terms of dust and other contaminant conditions in the return airways, it can be concluded that there is potential for use of recirculation in the face area.
Guidelines for recirculation systems in gassy and dusty mines are developed. The main features for these recirculation system design guidelines are safety, economic gain, and system performance.
The author's attribution to ventilation is in the use of controlled recirculation to reduce winter heating costs and increase underground airflow, also the guidelines developed for recirculation in gassy and dusty mines.
The overall conclusion is that controlled recirculation is a practical method of reducing winter heating cost and/or increasing mine airflows. The financial potential and technology to implement a working system exist.Applied Science, Faculty of
Mining Engineering, Keevil Institute of
Graduate
43
Mengwe, Moses Seargent. „Towards social impact assessment of copper-nickel mining in Botswana“. Thesis, Nelson Mandela Metropolitan University, 2010. http://hdl.handle.net/10948/1443.
Der volle Inhalt der QuelleAnnotation:
This research study is more of an initiative towards Social Impact Assessment of copper-nickel mining in Botswana. The specific objectives of the study were centred on the assessment of the social impacts of copper-nickel mining in Botswana from the initial mining stage of exploration, surveying and mine site development to mine closure. The study was carried out under the broad hypotheses that mining influences population movement that impact on areas of mining; mining activities have both economic benefits and deleterious social impacts on the local communities found in the areas where mining is taking place; and mine closure has far reaching socio-economic, investment and developmental implications over and above the obvious interests of project owners. To achieve the broad aim as summarised above, the research study used a multi-disciplinary methodology and approach that required several kinds of expertise and sources of information. Hence it used both primary and secondary sources centred on interactive informative interviews, site visits and observations, questionnaires, census data records, mining companies’ publications, published textbooks and journal articles. The research study comprised of three different mines operated by three different mining companies in three varied socio-cultural and ethnic regions of Botswana. First was a detailed Social Impact Assessment of the initial phase of exploration, surveying and mine site development represented by Mowana mine project operated by African Copper in the rural areas of Dugwi and Mosetse. This case study yielded results showing that the social impacts of mining in the area are diverse and extensive. The findings suggest that the impacts relate not only to the possible economic benefits of foreign exchange, employment, the optimal use of available mineral resources and the possible development of Dugwi and Mosetse villages, but extends to the deleterious social impacts. The results also indicated that the social impacts have just begun in the two communities. Hence they point towards a possible disruption within the socio-cultural system of the local people if serious mitigation measures are not put in place; thus suggesting that the early stages of exploration and mine site development results in the most conflict between the mine and the local people. Second was a comprehensive Social Impact Assessment of Tati-Nickel Phoenix mining project in the peri-urban areas of Matshelagabedi and Matsiloje areas representing the mining stage of mine production and expansion. The results from this case study suggest that during vi mine production and expansion, many people were relocated. However, the overriding impression gained from the case study was Tati-Nickel Mining Company’s elaborate corporate policies that suggested good corporate governance and best practices that promote sustainable development. A notable milestone on good corporate governance and best practice that the other two case studies (mining company) could benchmark on is Tati-Nickel’s corporate social responsibility programme that has been designed to ensure that the communities within a fifty kilometre mine radius benefit from the mine. The results from the case study also distinguished the mining stage of production and expansion from the other two because it is associated with the deep entrenchment of the social impacts into the communities near to mining areas. Third was a detailed Social Impact Assessment on Bamangwato Concession Limited mine in the industrial town of Selebi-Phikwe. The case study represented the stage of mine closure. Through the findings of this case study, it became apparent that the economic dependence of Selebi-Phikwe on mining has seen the town developing into a mining town, increasing its vulnerability at mine closure. The results from the case study further suggest that mine closure will degrade the socio-economic sector of the town with ever far reaching socio-economic implications as many people lose their gainful employment, hence suggesting that a possible complete mine closure will be the most traumatic phase leading to major social conflict within the area. Thus the results suggest that at mine closure, the deleterious social impacts will overspill to other areas in Botswana with disastrous effects for the economy of the country. The results yielded through this study established in clear and passionate language that copper-nickel mining in Botswana influences population movements that lead to positive and negative impacts on the communities found in mining areas. Another major finding of the study is that copper-nickel mining activities have both economic benefits and deleterious social impacts on the local communities, hence the recommendation that the copper-nickel mining companies should embrace the concept of sustainable mining for sustainable development to avoid most of the negative impacts of their operations on the local communities.
44
Côté, Carol. „La distribution de l'or à la mine Montauban /“. Thèse, Chicoutimi : Université du Québec à Chicoutimi, 1989. http://theses.uqac.ca.
Der volle Inhalt der Quelle
45
Rossouw, Deon. „A technical risk evaluation of the Kantienpan volcanic hosted massive sulphide (VHMS) deposit and its financial viability“. Pretoria : [s.n.], 2003. http://upetd.up.ac.za/thesis/available/etd-08132008-094204/.
Der volle Inhalt der Quelle
46
Payne, Malcolm. „Form and the picturing of mining : an epistemology of form with special reference to the explication of iconography“. Master's thesis, University of Cape Town, 1992. http://hdl.handle.net/11427/16369.
Der volle Inhalt der QuelleAnnotation:
Bibliography: pages 67-72.The work presented here is a bounded excerpt of a broader programme of creative endeavour. Framed by the constraints of the MFA degree , the special value of this project has been the opportunity it has presented to articulate some of the ideas that have developed over a period of time and have informed my working process. The theme of mining and related activities forms the visible field in which I have extended my formal pictorial methodology . The visual primacy and corporeality of form in painting have been the enabling vehicles assisting me to re - code selected iconography. The genealogy of this form and its development is chronologically traced in three groups of work preceding the body of work executed for the MFA.
47
Archambeault, Louis. „Application of Markov decision processes to mine optimisation : a real option approach“. Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99750.
Der volle Inhalt der QuelleAnnotation:
This thesis describes preliminary research on the application of Markov Decision Processes (MDPs) to the optimisation of mine scheduling in an uncertain environment. The MDP framework is a novel approach to scheduling in a mining operation and option valuation. The task of scheduling in mining operations is dependent on the availability of models that permit the representation of some of the key stochastic properties of the environment, such as grade and price uncertainty. The tools used to model these processes are respectively sequential Gaussian simulation and Geometric Brownian motion. Three cases of increasing size are used to illustrate the results of the model and demonstrate its suitability to mine scheduling and option valuation. The computational efficiencies of solving an MDP formulation by Policy Iteration and Value Iteration are compared. The impact of the discount rate on the optimal policy is assessed. To determine the value of one or several options, an optimal policy without options is generated and valued. Then, the exercise is repeated with the relevant options to value (e.g., production rate, cut-off grade and time of mine closure). By comparing the values obtained in both cases, the financial benefit of having operational flexibility is determined, thus yielding the option value. A full size case study is conducted to validate the applicability of MDPs to real mining projects.
48
CLARKE, MICHAEL. „HYDROTHERMAL GEOCHEMISTRY OF SILVER-GOLD VEIN FORMATION IN THE TAYOLTITA MINE AND SAN DIMAS MINING DISTRICT, DURANGO AND SINALOA, MEXICO (SIERRA MADRE, FLUID INCLUSIONS)“. Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183942.
Der volle Inhalt der QuelleAnnotation:
The San Dimas mining district, including the Tayoltita mine, is a Tertiary silver-gold epithermal vein system deposited in a calcalkaline volcanic pile. Hydrothermal alteration and vein formation is temporally related to a granite batholith intruded into the volcanics. Alteration mineralogy in andesites is compatible with a hydrothermal flow model in which heated water rises through the batholith, cools to 260°C, and flows out into the volcanics. In the process, a(Na)⁺/a(H)⁺, a(K)⁺/a(H)⁺, a(Ca)⁺⁺/a²(H)⁺, a(SO₄)⁼.a²(H)⁺, and a(H₂S) increase; a(A1)⁺⁺⁺/a³(H)⁺ decreases; and a(Fe)⁺⁺/a² (H)⁺ remains constant, all relative to original fluid conditions in the andesites. Lateral elongation of Ag:Au ratio zoning plotted on vertical projections of veins is interpreted to reflect hydrothermal fluid flow principally in a horizontal direction during ore deposition. Quartz vein-filling, accompanied by chlorite, calcite, rhodonite, and adularia, is widest in a vertical interval approximately 500 to 1,000 meters below the original surface. Pyrite is widely distributed, but silver minerals, electrum, and base-metal sulfides are restricted to the upper portion of the vertical interval of veining in a zone termed the ore horizon. Paragenetic relationships among vein minerals of the Cinco Senores vein in the Tayoltita mine indicate that a(H₂S) decreased; a(Cu)⁺/a(H)⁺, a(Ag)⁺/a(H)⁺, and a(Au)⁺/a(H)⁺ increased; and a(Fe)⁺⁺/a²(H)⁺ and a(SO₄)⁼.a²(H)⁺ remained nearly constant during the initial stage of ore deposition. Fluid inclusion studies of quartz from the Cinco Senores vein indicate that ore deposited at an average temperature of 260°C from boiling fluids of apparent salinities ranging from 0.15 to 0.3 m(NaCl) equivalent. The greater apparent salinities probably reflect dissolved gases as well as chloride salts. Correlation of Ag:Au ratios in deposited vein with ice-melting temperatures in fluid inclusions suggests that evolution of ore fluids in space was accompanied by both increase in deposited Ag:Au ratios and decline in fluid solute concentration. Correlation of ice-melting temperatures with paragenetic age of associated quartz suggests that vein-depositing hydrothermal fluids evolved in both space and time from relatively concentrated to dilute conditions. Both boiling and mixing could have caused this decline in solute concentration.
49
Nelson, Stephen Eric 1960. „The geology and mineralization potential of the Bella Vista-Ingot area, Shasta County, California“. Thesis, The University of Arizona, 1986. http://hdl.handle.net/10150/558057.
Der volle Inhalt der Quelle
50
Morehouse, Jeffrey Allen 1953-1985. „A synopsis of the geologic and structural history of the Randsburg Mining District“. Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/558085.
Der volle Inhalt der Quelle