Letteratura scientifica selezionata sul tema "Deposits and depositors"
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Articoli di riviste sul tema "Deposits and depositors"
1
Tumbelaka, Indra. "How Did Depositors React to Bank Risks During the Covid-19 Outbreak in Indonesia?" International Journal of Financial Systems 1, n. 2 (18 gennaio 2024): 133–50. http://dx.doi.org/10.61459/ijfs.v1i2.27.
Testo completoAbstract (sommario):
The Covid-19 outbreak provides a unique setting to examine the association between deposits and bank risk, including loan risk, as both deposits and loan risk increased significantly during the outbreak. Employing dynamic regression models in datasets from the Indonesian banking industry before and during the Covid-19 outbreak, this study provides new evidence that depositor discipline is stronger during the outbreak, as depositors are more sensitive to loan risk. The findings are different from prior studies in that depositor discipline tends to diminish during the crisis period. Furthermore, this study confirms the effectiveness of the deposit insurance system implementation, as uninsured depositors exercise stronger discipline. Last but not least, this study documents that depositor discipline is weaker in government banks as those banks are perceived as having implicit guarantees from the government.
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Lamichhane, Pitambar. "Depositors’ perception on performance in Nepalese commercial banks". Management Dynamics 23, n. 1 (9 marzo 2020): 21–36. http://dx.doi.org/10.3126/md.v23i1.35541.
Testo completoAbstract (sommario):
This paper analyzes bank depositors’ perception in relation to factors explaining performance of banks in Nepal. This study has applied descriptive and explorative research design to analyze factors affecting bank performance. A survey was made to collect data from bank depositors using structural questionnaire in Kathmandu valley in 2019. Survey result reveals that Nepalese depositors prefer to deposit money in commercial banks because of easy access but are not satisfied with e-banking services. Most of depositors have no ownership in banks and feel interest rate on deposits is less than expectations. Similarly, result shows that depositors prefer to deposit in saving account analyzing risk and feel government rules and regulations affect interest rates of banks. Further, result indicates banks’ image and interest rate on deposits are key factors for bank deposits and performance, poor operating performance and lack of appropriate investment opportunities are reasons of low interest rate on bank savings. Finally, result concludes that use of modern technologies, size of deposits, market information, managerial efficiency, size of lending and deposits of banks are significant factors and size of debt capital and assets are weak factors affecting performance in Nepalese commercial banks.
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Rotemberg, Julio J. "A Behavioral Model of the Popularity and Regulation of Demandable Liabilities". American Economic Journal: Macroeconomics 7, n. 3 (1 luglio 2015): 123–52. http://dx.doi.org/10.1257/mac.20130143.
Testo completoAbstract (sommario):
Overoptimism regarding one's ability to arrive early in a queue is shown to rationalize deposit contracts in which people can withdraw their funds on demand even if consumption takes place later. Capitalized institutions serving overoptimistic depositors emerge in equilibrium even if depositors and bank owners have identical preferences and investment opportunities. Consistent with the evidence, runs can lead people to move their deposits from one intermediary to another. Regulatory policies, including deposit insurance, minimum capital requirements and restrictions on the assets held by depository institutions can increase the ex ante welfare of depositors. (JEL G21, G28, G32, L51)
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Salam, Rully Trihantana e Mohamad Kharis Mubarok. "ANALISIS NISBAH BAGI HASIL TERHADAP JUMLAH NASABAH DEPOSITO MUDRABAH (Studi Di Koperasi Baitul Mall Wat Tamwiil Khidmatul)". SAHID BUSINESS JOURNAL 1, n. 01 (2 marzo 2022): 8–20. http://dx.doi.org/10.56406/sahidbusinessjournal.v1i01.29.
Testo completoAbstract (sommario):
Abstract
Baitul Maal Wat Tamwil (BMT) was originally established as a people's economic institution that helps the poor, the poor and near poor. However, it is growing, by creating fund-raising products. Fund-raising products include savings deposits and time deposits (deposits) with the mudharabah principle. The establishment of BMT is intended to encourage economic empowerment through the provision of sharia products. For this reason BMT can be well received by the community. The type of research is quantitative descriptive, namely the results of calculations from the percentage of profit sharing ratio for mudharabah deposits for a period of 12 months and data on the number of customers of mudharabah deposits for a period of 12 months in the last 3 years, namely from 2017 - 2019. The results of this study indicate that the profit sharing ratio variable and the number of mudharabah depositors has a positive relationship as evidenced by the increasing number of deposit customers at KBMT Khidmatul Ummah because the profit sharing ratio for mudharabah deposits provided/offered by KBMT Khidmatul Ummah is very profitable for depositors and tempting for prospective depositors. Conclusions from this study Based on the results of the correlation analysis, the results of the correlation analysis test showed a positive sign (+) which means that there is a positive relationship between the two. The correlation magnitude is 0.972 (> 0.05), meaning the percentage rate is strongly correlated with an increase in the number of depositors.
Keywords: Profit Sharing Ratio, Mudrabah Deposit Customers and KSPPS
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Moyo, Zibusiso, e Sophia Mukorera. "Liquidity And Deposit Insurance: The Case Of Deposit-Taking Microfinance Institutions In Low-Income Sub-Saharan Africa". Management and Economics Research Journal 8, n. 4 (31 dicembre 2022): 1–10. http://dx.doi.org/10.18639/merj.2022.1782409.
Testo completoAbstract (sommario):
The objective of this study was to examine the relationship between liquidity and deposit insurance of Deposit-taking Microfinance Institutions (DTMFIs) in Low-Income Sub-Saharan Africa (LISSA). Several DTMFIs in the region defaulted in meeting withdrawals on deposits and collapsed with depositors’ funds. The failure of DTMFIs to be liquid has dire consequences such as contagion risk due to the sudden and unexpected deposit runs and oblivion of depositors’ funds, which further condemn the small savers into extreme poverty levels. Panel data from the Microfinance Information Exchange for the years 2006 to 2017 of 64 DTMFIs sampled across 18 LISSA countries was utilised. The estimated random effects results showed that explicit deposit insurance is positive and significantly related to liquidity. Additionally, the capital adequacy ratio and the Basel implementation dummy are positive and significant determinants of liquidity. The study concluded that designing and implementing explicit deposit insurance schemes mitigates liquidity risk in depository microfinance and maintaining adequate capital adequacy levels and implementation of Basel recommendations improves the liquidity positions of the LISSA DTMFIs. The study recommended formulation of deposit insurance policies that embrace microfinance deposits of all types and adherence to the Basel capital adequacy standards complements deposit protection in hedging liquidity risk.
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Ab Rahman, Sazana, Nor Hayati Ahmad e Noraziah Che Arshad. "BANK SPECIFIC AND MACROECONOMIC FACTORS INFLUENCING ISLAMIC BANKS DEPOSITS". Vol 6 No 2 (2021) 6, No.2 (31 dicembre 2021): 37–57. http://dx.doi.org/10.32890/ijib2021.6.2.4.
Testo completoAbstract (sommario):
Deposits are like the bloodline for banks as they determine banks' lending capacity and a country's economic savings. However, the existence of a dual banking system poses a challenge to Malaysian Islamic banks competing for deposits. Despite this problem, few investigations were done to comprehensively identify the factors that could help banks attract deposits, particularly for Islamic banks. The purpose of this paper is to fill this gap on deposits of 16 Islamic banks in Malaysia. Secondary data from the bank's annual reports and the Department of Statistics of Malaysia from 2015 to 2019 were analyzed, comprising Islamic Bank Deposits and seven predictors in an empirical model using STATA. The result shows a strong model fit with 92% R squared value that Return on Assets, bank concentration, and Business Enterprise Depositor affect Islamic Bank Deposits positively and significantly while Capital Adequacy Ratio showed negative and significant influence on the deposits. These factors are strongly effective to deposits, significant at 1% level. In contrast, Financing Deposit Ratio and Gross Domestic Product do not significantly influence Islamic deposits. Contrary to economic theory, this study found that an increase in inflation encourages customers to increase their saving deposits in Malaysian Islamic banks. The findings from this study are unique to Malaysian Islamic banks. They indicate important policy implications for Islamic banks practitioners, namely, to increase their focus on business enterprise customers, improve bank's market share and profitability in order to increase deposits while taking advantage of high inflationary period to attract more depositors.
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Xiao, Kairong. "Monetary Transmission through Shadow Banks". Review of Financial Studies 33, n. 6 (4 ottobre 2019): 2379–420. http://dx.doi.org/10.1093/rfs/hhz112.
Testo completoAbstract (sommario):
Abstract I find that shadow bank money creation significantly expands during monetary-tightening cycles. This “shadow banking channel” offsets reductions in commercial bank deposits and dampens the impact of monetary policy. Using a structural model of bank competition, I show that the difference in depositor clienteles quantitatively explains banks’ different responses to monetary policy. Facing a more yield-sensitive clientele, shadow banks are more likely to pass through rate hikes to depositors, thereby attracting more deposits when the Federal Reserve raises rates. My results suggest that monetary tightening could unintentionally increase financial fragility by driving deposits into the uninsured shadow banking sector. Authors have furnished an Internet Appendix, which is available on the Oxford University Press Web site next to the link to the final published paper online.
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Leonov, M. "Regulation of Deposit Interest Rates in Hong Kong". World Economy and International Relations, n. 10 (2015): 77–83. http://dx.doi.org/10.20542/0131-2227-2015-10-77-83.
Testo completoAbstract (sommario):
In 1960s, the regulation of deposit interest rate was introduced to maintain stability of the banking system in Hong Kong. Local regulatory mechanism was characterized by direct involvement of banks into determination of the maximum level of interest rates. As deposit rates might be fixed at below market equilibrium level, banks were unbounded to earn rents at the expense of undrawn interest payments to depositors. Unlike to people in other countries, the depositors in Hong Kong had limited access to alternative investment opportunities like mutual funds or deposit institutions. As long as retail deposits were accounted for a significant share of borrowed funds, Hong Kong Association of Banks developed some incentives to discipline banks: in particular, if bank offered deposits with above the maximum permissible rate, it could be excluded from the national clearing and settlement infrastructure. The binding level of rates led to the emergence of new financial products (swap-deposits and NOW accounts) because banks tried to retain dissatisfied customers. To avoid the negative consequences of rate regulation on industry competition and allocation of financial resources within the economy, Hong Kong Monetary Authority took decision to liberalize deposit rates using gradual reform approach in the mid-1990s – early 2000s. The deregulation caused the significant reduction of gap between deposit and market rates and that evidence gave support to the idea of restrictive nature of regulation regime in Hong Kong. At the time of increasing competition in the deposit market, banks were able to increase operating efficiency and maintain profitability. The main benefits were obtained by banks with risky business model that attracted retail deposits to increase the scope of activity. Deposit rate liberalization helped to improve the efficiency of the transmission mechanism of monetary policy. As banks more actively responded to the market situation by adjusting interest rates, the monetary policy actions increased influence on the investment and savings behavior of economic agents. Finally, intensified interest rate competition among banks resulted into the growth of depositors’ welfare, contributing to the sustainable socio-economic development of Hong Kong.
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Ismal, Rifki. "Depositors' withdrawal behavior in Islamic banking: case of Indonesia". Humanomics 27, n. 1 (22 febbraio 2011): 61–76. http://dx.doi.org/10.1108/08288661111110187.
Testo completoAbstract (sommario):
PurposeIslamic banks need to manage depositors' deposit withdrawals in a well manner in order to be able to optimize depositors' funds in their portfolio financing. Taking into account the Indonesian Islamic banking industry as a study case, this paper attempts to analyze the depositors' withdrawal behavior. Moreover, it also analyzes the responses of Islamic banks to mitigate such deposit withdrawals.Design/methodology/approachFirst, the paper accommodates the flow of funds of the Indonesian Islamic banking operations. Second, it formulates a liability side model of the competitive Islamic banking industry referring to some ideas from the conventional models. Then, the paper uses linear probability model (LPM) to identify depositors' withdrawal behavior and to analyze the responses of Islamic banks to mitigate deposit withdrawals.FindingsIt is found that depositors withdraw their money if: Islamic banks do not generate incomes from their financing; interest rate goes up; and total deposits tend to decrease. As such, Islamic banks have to anticipate this withdrawal behavior by doing two actions: reserving some liquidity and adjusting return sharing ratio to depositors. The output of this paper should benefit the policy markers and Islamic banks to understand depositors' behavior in withdrawing money and determine appropriate policies to manage it.Originality/valueThe best of author's knowledge, this is the first paper trying to analyze the depositors' withdrawal behavior with LPM model taking into account the Indonesian Islamic banking industry.
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Hanif Noor Athief, Fauzul, e Aminudin Ma’ruf. "Tracing the asymmetry of religiosity-based loyalty of Islamic bank depositors". Banks and Bank Systems 18, n. 1 (9 gennaio 2023): 1–13. http://dx.doi.org/10.21511/bbs.18(1).2023.01.
Testo completoAbstract (sommario):
Religiosity is one of many essential aspects that stands as the motivation of people’s behaviour. Its importance expands to the field of banking, especially Islamic banks that take Islamic teaching as their backbone. This study aimed to seek religiosity motivation among Islamic bank depositors by exploring the possible asymmetric effect of interest rates on the type of deposits. By using the NARDL approach, this study investigates the relationship between the conventional deposit interest rate on the type of depositors and deposit maturity by using monthly data from April 2015 until March 2020 of Indonesia’s Islamic banks. The results show that government deposit in Islamic bank is not affected by the raise of interest rate. In addition, all deposits that showed the possibility of asymmetry effect indicated that the increase of interest rate (LIR+) has a positive coefficient. In general, Indonesian Islamic bank depositors’ are religiously loyal and not attracted to the fluctuation of interest rates. The result also found that short-run asymmetric dynamics show convergent to long-run asymmetry after an average of 15 months. As for the policy implications, stakeholders must ease the regulation of Islamic banks such as the conversion of conventional banks to Islamic banks, since it is proven that customers are mainly religiously driven.
Tesi sul tema "Deposits and depositors"
1
Siu, Man-kun. "The impact of the abolishment of the interest rate agreement on depositors : the case in Hong Kong /". Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B14723967.
Testo completo
2
Ngaujake, Uahatjiri. "Protecting depositors and promoting financial stability in South Africa : is there a case for the introduction of deposit insurance?" Thesis, Rhodes University, 2004. http://hdl.handle.net/10962/d1002760.
Testo completoAbstract (sommario):
Banks play a pivotal role in economic growth and development of all countries and therefore the stability of the banking system is a vital goal of bank supervisors. Banks act as delegated monitors of depositors’ funds and this relationship, like all principal-agent relationships, presents agency problems. In the case of banks agency problems arise because depositors cannot accurately assess the financial health of banks due to the asymmetry of information existing between banks and depositors. Because banks possess private information on their borrowers, which depositors cannot access, it exposes depositors to risk of loss of deposits in cases of bank failures originating from nonrepayment of such loans. This asymmetry of information also exposes banks to runs by depositors and these runs can lead to bank failures with devastating effects for the financial system and the economy at large. It is for this reason that banks are regulated and supervised more than other institutions. Bank failures are a worldwide phenomenon and South Africa is no exception as evidenced by historical and recent bank failures in South Africa. This thesis investigates the desirability of introducing an explicit deposit insurance scheme in South Africa as a means of protecting small, unsophisticated depositors who are almost always the losers when banks fail, and promoting financial stability. The study finds that bank failures in South Africa are mainly attributable to mismanagement of banks, liquidity problems and fraud. Bank failures as a result of the aforementioned reasons have led to depositors losing their deposits in South Africa. The absence of a clearly defined depositor protection scheme in South Africa, the inadequacy of the hitherto implicit guarantee system to protect depositors, and the poor record of the South African Reserve Bank in bank failure resolution, form the basis of the conclusion of the study, i.e., there is a case for the introduction of deposit insurance in South Africa. In order to assist South African policymakers in designing an effective deposit insurance scheme for the country, the thesis further provides a guide on how the most important design features of deposit insurance should be handled. This is in an attempt to ensure that the moral hazard problem inherent in deposit insurance is overcome.
3
Siu, Man-kun, e 蕭文琴. "The impact of the abolishment of the interest rate agreement on depositors: the case in Hong Kong". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31266800.
Testo completo
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Kördel, Andreas. "Modeling Deposit Rates of Non-Maturity Deposits". Thesis, KTH, Matematisk statistik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207188.
Testo completoAbstract (sommario):
The modeling of non-maturity deposits is a topic that is highlyimportant to many banks because of the large amount of funding that comes fromthese products. It is also a topic that currently is in the focus oflegislators. Although a non-maturity deposit may seem to be a trivial product,it has several characteristics that make it rather complex. One of the twopurposes of this thesis is to compare different models for the deposit rate ofnon-maturity deposits and to investigate the strengths and weaknesses of themodels. The other purpose is to find a new model for the deposit rate ofnon-maturity deposits. Several different models that are suggested in the literatureare described and evaluated based on the four aspects; goodness of fit,stability, negative interest rate environment and simplicity. Three new modelsfor the deposit rate are suggested in this thesis, one of which shows a verygood performance compared to the models that can be found in the literature.Modellering av icke tidsbunden inlåning är ett ämne som är mycket viktigt för många banker på grund av den stora andel finansiering som kommer från dessa produkter. Det är också ett ämne som för närvarande väcker lagstiftares intresse. Även om icke tidsbunden inlåning kan tyckas vara en trivial produkt, har den flera egenskaper som gör den komplex. Ett av de två syftena med detta arbete är att jämföra olika modeller för kundräntan i icke tidsbunden inlåning och att undersöka modellernas styrkor och svagheter. Det andra syftet är att introducera en ny modell för kundräntan i icke tidsbunden inlåning. Flera olika modeller från litteraturen beskrivs och utvärderas baserat på de fyra utgångspunkterna passform, stabilitet, negativ räntemiljö och enkelhet. Tre nya modeller av kundräntor för icke tidsbunden inlåning föreslås i detta arbete, varav en visar ett mycket bra resultat jämfört med de modeller som föreslås i litteraturen.
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Neder, Renato Dantas. "Depositos de sulfeto maciço associados a rochas vulcanicas : o caso do deposito Zn-Pb do Expedito, Aripuana, MT, Brasil". [s.n.], 2002. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287171.
Testo completoAbstract (sommario):
Orientador : Bernardino Ribeiro de FigueiredoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Geociencias
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Doutorado
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Whitbread, Michael Andrew Ian, e n/a. "Lithogeochemichal alteration aound the Century and Elura Zn-Pb-Ag deposits: detecting alteration expressions in deep and near surface environments". University of Canberra. Resource, Environmental & Heritage Sciences, 2004. http://erl.canberra.edu.au./public/adt-AUC20051129.112425.
Testo completoAbstract (sommario):
Exploration companies commonly rely on geochemistry to identify alteration of
distinctive geochemical and mineralogical character, surrounding metal sulphide
deposits that were precipitated from hydrothermal fluids. However, examination of
raw analytical data is prone to error due to closure effects and the difficulty in
removing the effects of background variation in unaltered rocks from the variations
imposed by later hydrothermal alteration. Closure can be avoided by using ratios, or
by utilising mass balance approaches based on fixing volume, mass or concentration
changes between samples of parent and daughter lithologies. Using a parent-daughter
approach is limiting, because only pairs of samples can be compared at any one time
and because an unaltered equivalent must be produced for each sample examined in
this way. Pearce Element Ratio analysis and General Element Ratio analysis (PER
and GER) are not restricted in this fashion, and are more amenable to interrogation of
large data sets. PER and GER are also capable of decoupling background variation
from that variation due to hydrothermal alteration. Furthermore, these ratio methods
are readily applied to commercially derived lithogeochemical assays.
In this study, various analytical methods and interpretive techniques (including PER
and GER) have been applied to identify alteration in rocks around the Century and
Elura Zn-Pb-Ag deposits, and to assess whether primary ore-related alteration effects
can still be identified once altered rocks have been subjected to weathering.
Ratios of trace elements over a conserved element have been used to generate a suite
of pathfinder elements for each deposit. Elements enriched in host rocks around both
deposits include the economic metals Zn, Pb and Ag, along with Rb and Tl. Sodium is
ubiquitously depleted in altered rocks. Other elements in the pathfinder suites are
distinctive to each deposit type, and include a number of major and trace elements
that are added or removed from the rocks around the mineralised zones. For example,
Sb and As are enriched in rocks around Elura mineralisation while Ge and Cd are
enriched in samples around Century deposit.
Iron carbonate development accompanied by potassic alteration, the destruction of
albite and the absence of chlorite are the dominant mineral alteration effects at both
deposits. PER and GER diagrams have been used to quantify the intensity of this
alteration and allow lithogeochemistry to be used to vector towards high intensity
alteration, which is adjacent to Century and Elura mineralisation. These ratio methods
are applied to both visibly and cryptically altered rocks at both deposits, and have a
very high degree of success in classifying alteration in unweathered rocks.
The following simple PER ratios indicate proximity to Elura mineralisation:
Ca/C, K/Al for shales, K/(Al-Na) for siltstones/sandstones.
The following simple PER ratios indicate proximity to Century mineralisation:
Mn/Ti, Mg/Ti and Fe/Ti vs C/Ti, K/Ti vs Al/Ti, K/Ti vs (Al-Na)/Ti.
Pathfinder elements can be overlain onto PER and GER diagrams to aid in ranking the
prospectivity of samples, and to assess mineral hosts for individual pathfinder
elements.
Weathering destroys most indicators of alteration in the Elura area, while alteration
signatures are better preserved in host rocks around the Century deposit.
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Salmazo, Eduardo 1980. "Modelagem matemática da evolução de domos salinos sua influência na perfuração de poços de petróleo". [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263224.
Testo completoAbstract (sommario):
Orientador: José Ricardo Pelaquim MendesDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica e Instituto de Geociências
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Resumo: Neste trabalho discute-se os desafios associados à atividade de perfuração de poços de petróleo através de formações afetadas pela presença de domos salinos. Domos salinos podem induzir grandes tensões nas formações subjacentes e adjacentes, impondo a necessidade de um planejamento específico para a perfuração e manutenção de poços de petróleo. Durante a perfuração, em frente à zonda de sal, há relatos de problemas de aprisionamento de coluna, dissolução de sal no fluido de perfuração, ocasionando a formação de batentes mecânicos e cavernas. Há ainda, nas formações que rodeiam um domo salino, devido à alterações no campo de tensões, problemas de instabilidade nas paredes do poço aberto e formação de zonas anormalmente prossurizadas. Após o revestimento do poço, há casos de colapso do revestimento. Para prever e mitigar os riscos associados à essa atividade é de fundamental importância o entendimento dos fenômenos físicos que o ocasionam. Com essa finalidade, foi feito um estudo à respeito de tais mecanismo físicos como fluência e instabilidade hidrodinâmica, mais especificamente a instabilidade de Rayleigh-Taylor. Desenvolveu-se, a partir de tal estudo, um modelo analítico para prever o desenvolvimento de um domo salino e discutiu-se a forma como este pode interferir em parâmetros importantes para a atividade de perfuração como, por exemplo, o campo de tensões nas formações adjacentes às camadas de sal
Abstract: In this present work are discussed the challenges associated with the drilling activities in oil wells through formations affected by the presence of salt domes. This geological structures can induce large stresses in the underlaying and adjacent formations, imposing the necessity of specific planning for drilling and maintenance of such oil wells. During drilling, facing the salt, there are reports of problems of stuck pipe, salt dissolution, forming mechanical stops and caves. There are still, in formations around a salt dome, due changes in the stress field, problems of well instability and abnormally pressure zones. After casing, there are cases of case collapse. To prevent and mitigate risks associated to this activity, is crucial understand the physical phenomena behind it. With such finality, was made an study related with such physical mechanisms, such hydrodynamic instability, specifically the Rayleigh-Taylor instability. Was developed, from this study, an analytical model to predict the salt dome development and was discussed the way such it can interfer in important paramenters related to the drilling activity as, for exemple, the tension field in the formation around the salt dome
Mestrado
Explotação
Mestre em Ciências e Engenharia de Petróleo
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Abichequer, Luciana Arnt. "Análise e proposição de metodologias para simulação de composições em depósitos multivariados complexos". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/148951.
Testo completoAbstract (sommario):
A cossimulação de teores em depósitos multivariados complexos com mais de três variáveis envolvidas, quando realizada por métodos clássicos, é extremamente trabalhosa e acaba por gerar resultados que precisam de ajuste posterior, principalmente com relação ao fechamento da soma dos teores nos blocos ou faixas granulométricas de interesse. A necessidade de ajustes posteriores, aliada à falta de praticidade destes métodos, motiva a busca por soluções alternativas que gerem resultados tão ou mais precisos e, sejam mais facilmente implementáveis no dia a dia da indústria mineira. Nesta tese foi analisada a viabilidade de aplicação de cinco combinações de métodos como alternativa aos métodos clássicos: a simulação individual pelo método de bandas rotativas de cada uma das variáveis, em suporte de pontos posteriormente reblocados (combinação 1); a simulação das transformações ilrs, também pelo métodos de bandas rotativas, de forma individual e em suporte de pontos posteriormente reblocados (combinação 2); a simulação diretamente em suporte de blocos dos fatores MAFs (combinação 3); a simulação diretamente em suporte de blocos dos fatores MAFs das ilrs, com a utilização da variável artificial Resto, também utilizada nas combinações 1,2 e 3 (combinação 4) e; a simulação diretamente em suporte de blocos dos fatores MAFs das ilrs, com a operação de fechamento (combinação 5). Para aplicação da metodologia proposta foram simulados os teores das variáveis Alap, Fe, Si e Ti, retidas na faixa 14#, para um depósito de bauxita do norte do Brasil. Os resultados obtidos em todas as combinações foram analisados com relação ao grau de reprodução das características estatísticas e de continuidade espacial, reprodução das somas dos teores dos dados originais também na faixa simulada e a reprodução das correlações, ou reprodução da ausência de correlações, também nos cenários simulados. Após a análise dos resultados obtidos, se pode concluir que todas as combinações testadas são passíveis de utilização, no entanto, somente as combinações quatro e cinco proveem uma solução acabada para o problema em questão. Isto se deve ao fato de estas duas combinaões de métodos serem as únicas que combinaram: a decomposição MAF, para descorrelacionar as variáveis, simular cada uma de modo independente das demais e mesmo assim garantir a reprodução das correações no final do processo; a transformação ilr, que, por considerar as amostras como composições pertencentes ao espaço de soma restrita e constante, Simplex, garante que a soma dos teores esteja garantida nos resultados das simulações; e, a simulação diretamente em suporte de blocos, que foi incluída por evitar que um grande número de pontos precise ser simulado e posteriormente ajustado para o suporte de blocos, dando agilidade ao processo. A combinação cinco se mostrou ainda mais vantajosa por não fazer uso da variável artificial Resto, o que diminui o número de variáveis a serem efetivamente simuladas. Apesar das vantagens apontadas, é inegável que o usuário precisa conhecer e estar atento à sequência em que as transformações devem ser aplicadas sobre os dados originais.Cossimulation of complex multivariate deposits with more than three variables involved, when performed by classical methods, is extremely labor intensive and ultimately generate results that need further adjustment, especially with respect to the closing of the sum of the attributes of interest. The need for further adjustments, together with the difficulties in practical implementation of these methods, motivates the search for alternative solutions that generate results as or more accurate and which can be more easily implementable at the mining industry. This thesis analyzed the feasibility of five combinations of methods as an alternative to the classical ones: individual simulation by turning bands method, each variable at a time, in subsequent block support adjustment (combination 1); the simulation of ILRs transformations, also using the turning bands method, individually and followed by the block support correction (combination 2); the directly block simulation of MAFs factors (combination 3); direct block simulation of MAFs factors of ILRs with the use of artificial variable “Resto” also used in combinations 1,2 and 3 (combination 4) and direct block simulation of MAFs factors of ILRs with the closing operation (combination 5). To apply the proposed methodology, the following variables from a large bauxite deposit were chosen: mass retained at 14 # sieve, Alap, Fe, Si and Ti were simulated. The results obtained in all combinations were analyzed with respect to the level of reproduction of statistical characteristics and spatial continuity, reproduction of the sums of the grades of the original data also in the simulated scenarios, allied to variables cross-correlation reproduction in the simulated scenarios. The results lead to conclude that all tested combinations are amenable to use, however, only the 4 and 5 combinations provide a finished solution to the problem in question. The MAF decomposition was used to decorrelate the variables and so each one of those could be independently simulated, and the maintenance of correlations after the procces was assured, and the ilr transformation was included in both combinations 4 and 5 to provide results with constant sums of the grades in the sieve of interest. These two combinations guarantee the maintenance of the grades closed sum and correlations reproduction in simulated scenarios, and, still are computationally efficient as the block simulation was used to avoid the simulation of a large amount of points that need to be post processed. The last workflow proved to be even more advantageous for not using an artificial variable Resto, which reduces the number of variables to be effectively simulated. Despite of these advantages, it is undeniable that the user needs to know and to be aware of the sequence in which transformation should be applied to the original data.
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Крухмаль, Олена Валентинівна, Елена Валентиновна Крухмаль e Оlena Valentynivna Krukhmal. "Депозитна стратегія банків України в умовах фінансової кризи". Thesis, Українська академія банківської справи Національного банку України, 2009. http://essuir.sumdu.edu.ua/handle/123456789/61009.
Testo completoAbstract (sommario):
В роботі розглядаються напрямки оптимізації депозитної стратегії банків України в умовах фінансової кризи.Directions optimization strategy deposit banks in Ukraine in financial crisis considered in the article.
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Волохата, В. Є. "Система страхування банківських депозитів та її вдосконалення". Thesis, Українська академія банківської справи Національного банку України, 2008. http://essuir.sumdu.edu.ua/handle/123456789/60958.
Testo completoLibri sul tema "Deposits and depositors"
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Huizinga, Harry. Deposit insurance and international bank deposits. Brussels: Directorate-General for Economic and Financial Affairs, Commission of the European Communities, 2002.
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Ltd, Mintel International Group, a cura di. Deposits. London: Mintel International, 1998.
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Loney, Martin. Deposit insurance: Can informed depositors make a difference? Ottawa: Public Interest Advocacy Centre, 1995.
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A, Kizis Joseph, Mathewson David C, Lauha Eric A, Kantor Joseph A e Geological Society of Nevada, a cura di. Shallow expressions of deep, high-grade gold deposits: NW Rain/Tess deposits, West Bazza/Screamer deposits, SSX deposit : September 25-27. [Reno, Nev.]: Geological Society of Nevada, 1998.
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United States. Congress. House. Committee on Banking, Finance, and Urban Affairs. Subcommittee on General Oversight and Investigations. Insured brokered deposits and federal depository institutions: Hearing before the Subcommittee on General Oversight and Investigations of the Committee on Banking, Finance, and Urban Affairs, House of Representatives, One Hundred First Congress, first session, May 17, 1989. Washington: U.S. G.P.O., 1989.
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Sarioglu, Sulen. Tumor Deposits. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3.
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Gerdes, Gisela, e Wolfgang E. Krumbein, a cura di. Biolaminated Deposits. Berlin/Heidelberg: Springer-Verlag, 1987. http://dx.doi.org/10.1007/bfb0021878.
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Kaschnitz, Marie Luise. Grave deposits. [San Diego, CA]: Brighton Press, 2010.
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E, Krumbein Wolfgang, a cura di. Biolaminated deposits. Berlin: Springer-Verlag, 1987.
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Christian, Ravenne, American Association of Petroleum Geologists. e Institut Français du Pétrole, a cura di. Gravity deposits. Tulsa, Okla: AAPG, 1995.
Cerca il testo completoCapitoli di libri sul tema "Deposits and depositors"
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Chiaradia, Massimo. "Radiometric Dating Applied to Ore Deposits: Theory and Methods". In Isotopes in Economic Geology, Metallogenesis and Exploration, 15–35. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_2.
Testo completoAbstract (sommario):
AbstractMetallic ore deposits have contributed to the development of the human society since pre-historic times and nowadays are one of the pillars of unprecedented technological developments. In order to understand how metallic ore deposits form and thus construct genetic models that may serve as exploration guides, determining the age of an ore deposit is one of the most important pieces of information needed. More recently it has also become evident that determining the temporal duration of mineralizing events can offer valuable information on how certain deposits form and thus improve genetic models. Radiometric dating of ore minerals or of other minerals that are demonstrably associated in space and time with mineralization is the most accurate and precise tool to date an ore deposit. This Introductory Chapter summarizes basic concepts on why ore deposit dating is important and how this can be achieved through different methods. It illustrates basic differences among different methods and serves as an introduction to the more detailed descriptions of specific dating methods presented in the following Chapters.
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Sarioglu, Sulen. "Mechanisms of Metastasis". In Tumor Deposits, 1–35. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_1.
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Sarioglu, Sulen. "Tumor Deposits; Mechanisms, Morphology, and Differential Diagnosis". In Tumor Deposits, 37–55. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_2.
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Sarioglu, Sulen. "Tumor Deposits in Colorectal Cancer". In Tumor Deposits, 57–81. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_3.
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Sarioglu, Sulen. "Tumor Deposits in Gastric Cancer". In Tumor Deposits, 83–108. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_4.
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Sarioglu, Sulen. "Tumor Deposits in Esophageal Carcinomas". In Tumor Deposits, 109–15. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_5.
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Sarioglu, Sulen. "Peritoneal Carcinomatosis: Relation to Tumor Deposits". In Tumor Deposits, 117–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_6.
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Sarioglu, Sulen. "Tumor Deposits in Salivary Gland Carcinomas". In Tumor Deposits, 135–49. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_7.
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Sarioglu, Sulen. "Tumor Deposits in Head and Neck Tumors". In Tumor Deposits, 151–70. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_8.
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Sarioglu, Sulen. "Tumor Deposits in Breast Carcinomas". In Tumor Deposits, 171–85. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-68582-3_9.
Testo completoAtti di convegni sul tema "Deposits and depositors"
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Romanciuc, Gheorghe. "Particulars of accounting in the field of bank deposit guarantee". In Conferința științifică internațională studențească „Provocările contabilității în viziunea tinerilor cercetători”, ediția VII. Academy of Economic Studies of Moldova, 2023. http://dx.doi.org/10.53486/issc2023.46.
Testo completoAbstract (sommario):
Deposit guarantee schemes (DGS) are authorities that guarantee repayment of a limited amount to compensate depositors whose bank has failed. An underlying principle of DGS is that they are financed entirely by banks and that no taxpayer funds are used. Within SGD, there are a number of accounting peculiarities related to the specifics of existing operations between SGD and banks, as well as those related to the repayment of guaranteed deposits. This article fully analyzes the field of guaranteeing bank deposits in the Republic of Moldova and in particular the specifics of the accounting operations of the organization by identifying the distinctive features for this field of activity.
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Vassilyev, Ivan. "An Approach to Explain Bank Runs with Game Theory". In Konfrence doktorandů. Vysoká škola finanční a správní, 2023. http://dx.doi.org/10.37355/kd-2023-13.
Testo completoAbstract (sommario):
This paper presents an approach to understand the bank runs with game theory. In the model, each player decides if they withdraw their deposit from the bank and loose accumulated interest or leave the deposit in the bank risking losing the deposit partially or completely. The model considers interest rates, transaction fees, and deposit insurance. The aim of the contribution is to analyse the root cause of bank runs and investigate the impact of deposit insurance on the depositors’ withdrawal strategies. Within a dynamic game with incomplete information, a playoff matrix for players is build and the results are analyzed. The results show that there two Bayesian Nash equilibrium and two strategies that can be considered as optimal in the game without deposit insurance which leads to a bank run. On the other hand, with deposit insurance introduced in the game, the optimal strategy is to keep the deposits in the bank which minimizes probability of bank runs.
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Chelliah, Shobhana. "Making Photographs in Language Archives Maximally Useful: Metadata Guidelines for Community and Academic Depositors". In International Workshop on Digital Language Archives: LangArc-2023. University of North Texas, 2023. http://dx.doi.org/10.12794/langarc2114301.
Testo completoAbstract (sommario):
Collections in language archives typically include photographs. The purpose of these photographs is to supplement linguistic information about materials, places, and people related to cultural activities that are being forgotten. Instruction on metadata creation for these photograph deposits must take into consideration the variety of depositors to and users of language archives. In addition to the use of existing controlled vocabularies, classification lists, or thesauri in metadata creation, we observe in metadata for photographs the need for open-ended descriptions of personal experience related to the objects, places, and things photographed.
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Ctibor, P., P. Rohan e P. Chráska. "Effect of Spraying Distance on Plasma Deposit’s Behavior". In ITSC2001, a cura di Christopher C. Berndt, Khiam A. Khor e Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0677.
Testo completoAbstract (sommario):
Abstract Spraying distance (SD) is one of the main parameters that can affect the spraying process - its efficiency as well as deposit's character. The reason lies in a different thermal history of particles corresponding to different spraying distances. Variation in the structure, preferred orientation, variation of the phase contents and/or in the chemical composition of deposits can be then found for different SDs. Consequently, properties of coatings can greatly vary, not only in the resistance state but also on deposit's annealing. Some materials are, however, more and some less sensitive to that effect. The goal of this work is to compare CaTiO3 samples produced by plasma spraying with WSP at SD = 350 and 450mm with sintered samples. The following properties were compared: microhardness, thermal expansion coefficient, permittivity and reflectivity. Porosity and the differential thermal analysis of resistance and annealed deposits were also compared. Perovskite CaTiO3 belongs among materials very stable during spraying - neither chemical nor phase differences were found between the feedstock powder, free-flight particles, as-sprayed deposit and annealed deposit. Despite that there are significant differences in behavior of deposits and freestanding parts sprayed from different SDs. All the recorded differences for CaTiO3 plasma sprayed deposits with varying SDs must be therefore accounted to the deposit's structural differences, such as pore and splat sizes and shapes and preferred orientation. Additional differences on annealing can be probably attributed to the different amount of "stored" thermal energy in deposits due to the varying SD. However, there is a lower limit for SD assuring a quality deposit on spraying.
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Chraska, P., V. Brozek, B. J. Kolman, J. Ilavsky, K. Neufuss, J. Dubsky e K. Volenik. "Porosity Control of Thermally Sprayed Ceramic Deposits". In ITSC 1998, a cura di Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1299.
Testo completoAbstract (sommario):
Abstract Porosity regulates the deposit's properties and therefore methods for its control are of a vital industrial importance. Thermal spraying can produce deposits in a wide range of porosities by selection of a spray process itself, by selection of spray parameters, feedstock size and chemistry, etc. Manufacturing of deposits with controlled porosity may be difficult if the selection of spray processes and materials is limited. Special methods of deposition or/and subsequent post processing may be therefore necessary. These methods are studied in the presented work. All spraying was done with the water-stabilized plasma (WSP®) system PAL 160. Thick deposits and free-standing parts were sprayed from alumina, zircon, metal Al and Ni powders and their combinations. Porosity was characterized by number of techniques such as gas permeability, water immersion, MIP, SEM and SANS. Mechanical properties were characterized by the Young's modulus. Special methods of deposition, such as spraying of mixtures of ceramics and metals were successfully used. Either sandwiched-structures with alternating layers of ceramics and metals were sprayed (for the sealing purpose) or mechanical mixtures of ceramic and metallic feedstock were sprayed. Several post-processing methods were used to change porosity volumes or other materials characteristics. To increase the porosity the metallic phases were subsequently removed by leaching or by annealing at temperatures above the melting point of metal. A number of sealing materials (organic and inorganic) were used to seal the pores by infiltration at ambient or higher pressures. The results show, that significant changes of porosity volume and, especially, of the gas permeability are possible. Another tested method was annealing/calcination of deposits, which resulted in an increase or decrease of porosity, depending on deposit's chemistry and annealing conditions. Results show that all used post processings are capable of significant changes of deposit microstructure and that they may be successfully applied in practice.
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Watanabe, Yusuke, Yuji Ichikawa, Kazuhiro Ogawa e Hideo Miura. "Microtexture and Electrical and Mechanical Properties of the Cold-Sprayed Copper Deposit". In ASME 2013 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ipack2013-73150.
Testo completoAbstract (sommario):
Cold-spray (CS) technique is a new coating technology that is based on the high-velocity impinging of small solid particles on a substrate. The CS technique can make a thick deposit with less heat influence. Recently, this CS technique has been applied to the formation of an electrically conductive copper layer on dielectric materials such as polymers or ceramics. Previous researches show that the deposits made by the CS technique have high strength and residual stress comparing with bulk copper. However, since the deposits show brittle fracture and cracks propagate along the interfaces of the deposited particles, the deposits can not be applied to the products for which high reliability is indispensable. Therefore, it is very important to clarify the dominant factors which change the crystallinity of the deposits comparing with that of bulk copper in order to improve the quality of the deposits. One of the important factors should be the integrity of the interfaces between the deposited fine particles. This study is to evaluate the micro-texture and physical properties of the cold-sprayed copper deposit. Electron back-scatter diffraction method was applied to the evaluation of the crystallinity of the deposits. In addition, the relationship between the crystallinity with both mechanical and electrical properties of the deposits was clarified quantitatively.
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Andrew, Colin J. "The Sedmochislenitsi Zn-Pb-Cu-Ag deposit, NW Bulgaria: could it be Irish-type? A review of the evidence". In Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/moxi6363.
Testo completoAbstract (sommario):
Sedmochislenitsi is a stratiform-stratabound Zn-Pb-Cu-Ag deposit hosted in Triassic carbonates in the NW of Bulgaria. The deposits have been compared to the Alpine-type Zn-Pb deposits of Raibl, Salafossa, Mezica-Topla and Bleiberg-Kreuth located in the area of the Italian, Slovenian, Austrian border however Sedmochislenitsi differs significantly from these deposits in the fact that it contains a et al body of copper mineralization comprised of chalcopyrite, bornite and tennantite with significant amounts of silver sulphosalts and native silver. Historically many authors have attributed the deposit to being of MVT-affinity whilst others have hinted at the deposits of being SEDEX-type. However, to date, despite some convincing analogies with some of the deposits in the Irish Midlands nobody as yet, has discussed the possibility of them being an Irish-type Zn-Pb deposit. This paper evaluates the evidence.
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Li, Weidong, Qiyu Huang, Xue Dong, Xuedong Gao e Lei Hou. "Experimental Study on Wax Removal With Real Wax Deposits". In 2018 12th International Pipeline Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipc2018-78121.
Testo completoAbstract (sommario):
Pipeline pigging is one of the most widely used wax remediation techniques in field practice. However, it still depends heavily on “rule-of-thumb” due to the limited understanding of wax deposit properties and wax removal mechanisms. By far, laboratory studies on pipeline pigging generally suffer a gross defect in test materials, i.e., the big discrepancy between the experimental wax samples and real wax deposits. To this end, this paper aims to explore the wax removal in pigging with naturally deposited wax, using a self-designed experimental facility. Wax deposit mass and wax content, two decisive indexes affecting wax removal, were also investigated. The experimental apparatus consists of two parts: a flow loop equipped with a detachable test section to achieve real wax deposits and a wax removal apparatus to perform pigging operations. The test section can be conveniently detached from the flow loop and/or mounted onto the wax removal apparatus for a quick conversion between wax deposition and pigging operation. The results indicate that a higher bulk flow temperature decreases the wax deposit mass and increases the wax content of deposit. Additionally, the distributions of wax content and wax layer thickness suggest that gravity settling plays no role in wax deposition. Moreover, the wax resistive force profile of naturally deposited wax presents four distinct stages, i.e., the build-up phase, the pre-plug phase, the plug phase and the production phase. To the best of the authors’ knowledge, this is the first study on wax removal with real wax deposits. It paves the way for the application of previous artificial-wax-based researches to real wax deposit scenarios.
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Reynolds, Neal A., R. Mark Allen, Peter Muhling e Charlie Gianfriddo. "Global Irish – Diversity of the diaspora". In Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/taym1799.
Testo completoAbstract (sommario):
The spectrum of zinc-lead deposits formed in basinal mineral systems encompasses VMS (volcanogenic massive sulphide), SHMS (shale-hosted massive sulphide), Irish-type and MVT (Mississippi valley Type) deposits. The platform carbonate-hosted part of that spectrum, the Irish-type and MVT deposits, has created the greatest challenges to pigeonholing approaches and the Irish Midland deposits have been variably considered as unique, “SedEx” variants, or MVT variants. In fact, the Irish-type spectrum of deposits can be considered as a global diaspora of diverse deposits that, nonetheless, show a number of distinct and economically significant characteristics in style and setting. For this reason, they warrant consideration as a discrete deposit type, though not in a neat pigeonhole, that is best considered in a mineralizing system context. The distinguishing features of Irish-type mineral systems can be considered in terms of source, trigger, pathway, trap, and preservation. The key features that distinguish Irish-type from ‘typical’ MVT and SHMS deposits are related to basin type and setting, timing of the mineralization event, mineralization style and chemistry, and deposit geometry. Empirically, these characteristic basin to deposit scale features overlap both MVT and SHMS but, together, are unique to Irish-type systems. This gives rise to criteria that can be applied to determine prospectivity of basins for Irish-type deposits and to target deposits within these basins. It is important to distinguish Irish-type from MVT systems because their economic characteristics are different. However, it is also important to recognise that there is great variability within the broad basinal carbonate-hosted zinc-lead deposit family and that each basin, and indeed each trend and deposit, are to some extent unique. It is therefore extremely important to avoid model-driven exploration and to develop a targeting understanding that acknowledges the model framework but is based on actual observations and data. To understand this diversity and targeting context, it is pertinent to consider the wide range of carbonate-hosted deposits that do not fit into the published MVT pigeonhole, including the Irish Midlands deposits; the Alpine deposits; deposits in the Basque-Cantabria Basin; deposits on the Gondwana margin including a number of deposits in North African,, southeast Turkey, Iran, and Duddar in Pakistan; the Early Cretaceous deposits on the Atlantic margin in Gabon; the Ordovician of the Sibumasu terrane (Tibet to Southeast Asia); Polaris in the Franklinian Basin; Nanisivik in the Borden Basin; and the Devonian Lennard Shelf deposits of Western Australia. All of these deposits occur in rift-sag basins with carbonate platforms, in some cases with multiple rift-sag cycles or with successor basins and, where constrained, the mineralization event is syn-basinal and typically related to early extension or inversion events. The deposits are stratabound and mostly tabular and continuous, often show strong direct control by extensional structures, are typically dominated by replacement, and commonly have significantly higher grades than ‘typical’ MVT deposits such as those in the mid-continent US, Silesia (Poland) and Pine Point (Canada).
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Blaney, Dave, e Edmond Coffey. "The volcano-stratigraphic setting of the Pallas Green Zn-Pb deposit, County Limerick." In Irish-type Zn-Pb deposits around the world. Irish Association for Economic Geology, 2023. http://dx.doi.org/10.61153/qhku2937.
Testo completoAbstract (sommario):
The Pallas Green deposit located in County Limerick is being actively explored by Glencore Zinc Ireland Ltd. The deposit displays broad similarities with other Waulsortian Limestone hosted deposits in the Irish Orefield in terms of stratigraphical setting, ore-hosting breccia textures and sulphide mineralogy. How-ever, there are a number of important differences, including a close association with igneous rocks, the scale of the ore-hosting breccia bodies, and the apparent absence of significant displacement normal faults control-ling the mineralizing system. The lack of obvious structural control, combined with spatial coincidence with volcanic rocks makes Pallas Green an “Irish-type” deposit with many unique characteristics and new insights into the origins of zinc-lead deposits in the Irish Orefield. This paper endeavours to outline the geological stting, influence of the volcanic activity, alteration and brecciation, and the nature and scale of the mineralizing system at Pallas Green and place the deposit in context and with respect to other “Irish-type” deposits.
Rapporti di organizzazioni sul tema "Deposits and depositors"
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Lougheed, H. D., M. B. McClenaghan, D. Layton-Matthews e M. I. Leybourne. Indicator minerals in fine-fraction till heavy-mineral concentrates determined by automated mineral analysis: examples from two Canadian polymetallic base-metal deposits. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328011.
Testo completoAbstract (sommario):
Exploration under glacial sediment cover is a necessary part of modern mineral exploration in Canada. Traditional indicator methods use visual examination to identify mineral grains in the 250 to 2000 µm fraction of till heavy-mineral concentrates (HMC). This study tests automated mineralogical methods using scanning electron microscopy to identify indicator minerals in the fine (<250 µm) HMC fraction of till. Automated mineralogy of polished grains from the fine HMC enables rapid data collection (10 000-300 000 grains/sample). Samples collected near two deposits were used to test this method: four from the upper-amphibolite facies Izok Lake volcanogenic massive-sulfide deposit, Nunavut, and five from the Sisson granite-hosted W-Mo deposit, New Brunswick. The less than 250 µm HMC fraction of till samples collected down ice of each deposit contain ore and alteration minerals typical of their deposit type. Sulfide minerals occur mainly as inclusions in oxidation-resistant minerals, including minerals previously identified in each deposit's metamorphic alteration halo, and are found to occur farther down ice than the grains identified visually in the greater than 250 µm HMC fraction. This project's workflow expands the detectable footprint for certain indicator minerals and enhances the information that can be collected from till samples.
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Boulianne-Verschelden, N., V. De Bronac de Vazelhes, I. McMartin e G. Beaudoin. Surficial geology, Amaruq deposit area, Kivalliq Region, Nunavut, NTS 66-H southeast. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329418.
Testo completoAbstract (sommario):
The Amaruq deposit map area is a glacial landscape dominated by till deposits (72% of map area) forming transverse ridges, hummocky moraine, or plains of varying thickness, occasionally streamlined. Glacial lake sediments cover about 18% of the map area and form thick to thin deposits covering the till. They occur predominantly in lowlands and below approximately 140 m a.s.l., which is the elevation of the highest raised beaches located in the western part of the map area. Some of the glacial lake sediments could have been deposited in a marine environment during high sea levels following deglaciation. Sand and gravel deposits occur in subglacial meltwater corridors forming terraces, esker ridges, and small hummocks, or in proglacial outwash plains. The effects of meltwater at the base of the glacier or by currents and waves in proglacial lake and/or marine basins have resulted in winnowing of fine particles, reworking of sediments, and surface boulder concentrations. Streamlined till landforms and striations indicate that ice flow was dominantly to the north-northwest. This predominant flow was locally succeeded by northwest and west-northwest ice flows as indicated by crosscutting striations. A late deglacial ice-flow direction converging towards a major esker tunnel is observed east of the Amaruq deposit.
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Peter, J. M., e M. G. Gadd. Introduction to the volcanic- and sediment-hosted base-metal ore systems synthesis volume, with a summary of findings. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328015.
Testo completoAbstract (sommario):
This volume presents results of research conducted during phase 5 of the Volcanic- and Sedimentary-hosted Base Metals Ore Systems project of the Geological Survey of Canada's Targeted Geoscience Initiative (TGI) program. The papers in this volume include syntheses and primary scientific reports. We present here a synopsis of the findings during this TGI project. Research activities have addressed several mineral deposit types hosted in sedimentary rocks: polymetallic hyper-enriched black shale, sedimentary exhalative Pb-Zn, carbonate-hosted Pb-Zn (Mississippi Valley-type; MVT), and fracture-controlled replacement Zn-Pb. Other carbonate-hosted deposits studied include a magnesite deposit at Mount Brussilof and a rare-earth element-F-Ba deposit at Rock Canyon Creek, both of which lack base metals but are spatially associated with the MVT deposits in the southern Rocky Mountains. Volcanogenic massive-sulfide deposits hosted in volcanic and mixed volcanic-sedimentary host rock settings were also examined. Through field geology, geochemical (lithogeochemistry, stable and radiogenic isotopes, fluid inclusions, and mineral chemistry), and geophysical (rock properties, magnetotelluric, and seismic) tools, the TGI research contributions have advanced genetic and exploration models for volcanic- and sedimentary-hosted base-metal deposits and developed new laboratory, geophysical, and field techniques to support exploration.
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Cipriani, Marco, Thomas M. Eisenbach e Anna Kovner. Tracing Bank Runs in Real Time. Federal Reserve Bank of New York, maggio 2024. http://dx.doi.org/10.59576/sr.1104.
Testo completoAbstract (sommario):
We use high-frequency interbank payments data to trace deposit flows in March 2023 and identify twenty-two banks that suffered a run—significantly more than the two that failed but fewer than the number that experienced large negative stock returns. The runs were driven by large (institutional) depositors, rather than many small (retail) depositors. While the runs were related to weak fundamentals, we find evidence for the importance of coordination because run banks were disproportionately publicly traded and many banks with similarly bad fundamentals did not suffer a run. Banks that survived a run did so by borrowing new funds and then raising deposit rates—not by selling liquid securities.
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Peter, J. M., M. G. Gadd, C. Jiang e J. Reyes. Organic geochemistry and petrology of sedimentary exhalative Pb-Zn and polymetallic hyper-enriched black shale deposits in the Selwyn Basin, Yukon. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328017.
Testo completoAbstract (sommario):
Paleozoic strata of the Selwyn Basin host sedimentary exhalative (SEDEX) Pb-Zn deposits, and age-correlative strata of the Richardson trough host polymetallic hyper-enriched black shale (HEBS) deposits. In both deposit types, organic matter is spatially and temporally associated with mineralization. We investigated the characteristics of organic matter in mineralization and unmineralized host rocks in the XY Central SEDEX deposit in the Howard's Pass district, and the Nick and Peel River HEBS deposits in the Richardson trough using Rock-Eval pyrolysis, organic petrography, and solvent extraction and gas chromatography mass spectrometry (GCMS) analysis of the soluble organic matter (SOM). All samples experienced extremely high thermal maturity (Tmax up to 599°C), indicating they contain low SOM. Rock-Eval parameters S1, S2, HI, and OI values are low. Total organic carbon (TOC) values are low for Nick and Peel River and are generally higher for XY Central. Residual carbon values are universally high. Mineral carbon values are low for deposits studied (one outlier). Pyrobitumen reflectance is mostly below 5.80%. Full-scan GCMS analyses of SOM reveal that most, if not all, high molecular weight hydrocarbons, including biomarkers, have been lost due to thermal cracking and many detected peaks are likely due to contaminants introduced during sampling.
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Blais-Stevens, A., A. Castagner, A. Grenier e K D Brewer. Preliminary results from a subbottom profiling survey of Seton Lake, British Columbia. Natural Resources Canada/CMSS/Information Management, 2023. http://dx.doi.org/10.4095/332277.
Testo completoAbstract (sommario):
Seton Lake is a freshwater fiord located in southwestern British Columbia, roughly 4 km west of Lillooet and 250 km north-northeast of Vancouver. Located in the Coast Mountains, it is an alpine lake about 22-km long and roughly 1-1.5 km wide. It is separated from nearby Anderson Lake, located to the west, by a large pre-historic rock avalanche deposit at Seton Portage. The lake stands at about 243 m above sea level and is up to about 150 m deep (BC gov., 1953). Water level is controlled by a hydroelectric dam (i.e., Seton dam) located at the eastern end of the lake. Here, the lake drains east into Seton Canal, a 5 km diversion of the flow of the Seton River, which begins at the Seton dam. The Seton Canal pushes water to the Seton Powerhouse, a hydroelectric generating station at the Fraser River, just south of the community of Sekw'el'was and confluence of the Seton River, which drains into the Fraser River at Lillooet. Seton Portage, Shalatlh, South Shalatlh, Tsal'alh (Shalath), Sekw'el'was (Cayoosh Creek), and T'it'q'et (Lillooet) are communities that surround the lake. Surrounded by mountainous terrain, the lake is flanked at mid-slope by glacial and colluvial sediments deposited during the last glacial and deglacial periods (Clague, 1989; Jakob, 2018). The bedrock consists mainly of mafic to ultramafic volcanic rocks with minor carbonate and argillite from the Carboniferous to Middle Jurassic periods (Journeay and Monger, 1994). As part of the Public Safety Geoscience Program at the Geological Survey of Canada (Natural Resources Canada), our goal is to provide baseline geoscience information to nearby communities, stakeholders and decision-makers. Our objective was to see what kind of sediments were deposited and specifically if we could identify underwater landslide deposits. Thus, we surveyed the lake using a Pinger SBP sub bottom profiler made by Knudsen Engineering Ltd., with dual 3.5 / 200 kHz transducers mounted to a small boat (see photo). This instrument transmits sound energy down through the water column that reflects off the lake bottom surface and underlying sediment layers. At the lake surface, the reflected sound energy is received by the profiler, recorded on a laptop computer, and integrated with GPS data. These data are processed to generate a two-dimensional image (or profile) showing the character of the lake bottom and underlying sediments along the route that the boat passed over. Our survey in 2022 recorded 98 profiles along Seton Lake. The red transect lines show the locations of the 20 profiles displayed on the poster. The types of sediments observed are mostly fine-grained glaciolacustrine sediments that are horizontally bedded with a subtle transition between glaciolacustrine to lacustrine (e.g., profiles A-A'; C-C'; F-F'; S-S'). Profile S-S' displays this transition zone. The glaciolacustrine sediments probably were deposited as the Cordilleran Ice Sheet retreated from the local area (~13,000-11,000 years ago; Clague, 2017) and the lacustrine sediments, after the ice receded to present-day conditions. Some of the parallel reflections are interrupted, suggesting abrupt sedimentation by deposits that are not horizontally bedded; these are interpreted as landslide deposits (see pink or blue deposits on profiles). The deposits that show disturbance in the sedimentation found within the horizontal beds are thought to be older landslides (e.g., blue arrows/deposits in profiles C-C'; E-E'; F-F'; G-G'; I-I'; J-J'; K-K'; N-N'; P-P'; Q-Q'; R-R'; T-T'; U-U'), but the ones that are found on top of the horizontally laminated sediments (red arrows/pink deposits), and close to the lake wall, are interpreted to be younger (e.g., profiles B-B'; C-C'; H-H'; K-K'; M-M'; O-O'; P-P'; Q-Q'). At the fan delta just west of Seton dam, where there was no acoustic signal penetration, it is interpreted that the delta failed and brought down coarser deposits at the bottom of the lake (e.g., profiles H-H'; M-M'; and perhaps K-K'). However, these could be glacial deposits, bedrock, or other coarser deposits. Some of the deposits that reflect poor penetration of the acoustic signal, below the glaciolacustrine sediments, could represent glacial deposits, old landslide deposits, or perhaps the presence of gas (orange arrows; e.g, B-B'; D-D'; J-J'; O-O', T-T'). The preliminary results from sub bottom profiling reveal that there are underwater landslides deposits of widely varying ages buried in the bottom of the lake. However, the exact timing of these is not known. Hence our preliminary survey gives an overview of the distribution of landslides where there seems to be a larger number of landslides recorded in the narrower eastern portion of the lake.
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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.
Testo completoAbstract (sommario):
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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Leybourne, M. I., J. M. Peter, M A Schmidt, D. Layton-Matthews, A. Voinot e L. Mathieu. Geochemical evidence for a magmatic contribution to the metal budget of the Windy Craggy Cu-Co(±Zn) volcanogenic massive-sulfide deposit, northwestern British Columbia. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328018.
Testo completoAbstract (sommario):
Volcanogenic massive-sulfide (VMS) deposits may have had metal contributions from magmatic degassing and leaching of footwall rocks. The Windy Craggy Cu-Co-Zn VMS deposit in northwestern British Columbia may include magmatic contributions, based on laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) of fluid inclusions (enriched in Sb, Sn, and Bi) and lithogeochemistry. Sulfide-mineral trace-element abundances in the massive-sulfide orebody, underlying stockwork zone, gold zone, and altered and unaltered mafic rock and argillite were analyzed by LA-ICP-MS. Elevated Au, W, As, Bi, Sb, Se, Te, Tl, Ag, Co, and Mo contents occur within the gold and/or stockwork zones. Increasing 'magmatic metals' with increasing Co/Ni values suggest direct magmatic contribution to the deposit. Covariation of Co with these so-called 'magmatic elements' indicates that it, too, may be of magmatic origin, sourced via fluids exsolved from a crystallizing magma; however, evidence from the composition of rocks and sulfide minerals from Windy Craggy and other VMS deposits suggests that there is probably no meaningful distinction between hydrothermal leaching and direct magmatic contributions and that most - if not all - fluids that form VMS deposits should be termed 'magmatic-hydrothermal'.
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Harrison, J. C., B. M. Saumur e D. R. Skipton. Mineral and carving-stone resources of Baffin Island. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/321858.
Testo completoAbstract (sommario):
Mineral resources of Baffin Island include iron (Mary River), diamonds, carbonate-hosted zinc and lead (Nanisivik), nickel, copper, platinum group elements, uranium, thorium, gemstones (sapphire, spinel, lapis lazuli), carving stone, and coal. Iron deposits include the Mary River No. 1 to 4 deposits of northern Baffin Island, which came into production in 2015 and contain 586 Mt grading 66% Fe. The Mesoproterozoic Borden Basin hosts the Nanisivik deposit, mined between 1976 and 2002; this is a Mississippi Valley-type deposit and contains 9.0% Zn, 0.7% Pb, and 41 ppm Ag. Diamond-rich kimberlite occurs as sheets and small pipes at Chidliak on Hall Peninsula; largest by area is the CH-1 (6 ha) pipe. At least 32 carving-stone localities are known; 7 communities on Baffin Island have good access to quarried material. Coal occurs in the Cretaceous-Paleogene Eclipse Trough of Bylot and northwestern Baffin islands. Exposures near Pond Inlet have been excavated for local use.
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Abad, Jorge, Galo Nuño e Carlos Thomas. CBDC and the operational framework of monetary policy. Madrid: Banco de España, febbraio 2024. http://dx.doi.org/10.53479/35997.
Testo completoAbstract (sommario):
We analyse the impact of introducing a central bank-issued digital currency (CBDC) on the operational framework of monetary policy and the macroeconomy as a whole. To this end, we develop a New Keynesian model with heterogeneous banks, a frictional interbank market, a central bank with deposit and lending facilities, and household preferences for different liquid assets. The model is calibrated to replicate the main monetary and financial aggregates in the euro area. Our analysis predicts that CBDC adoption implies a roughly equivalent reduction in banks’ deposit funding. However, this ‘deposit crunch’ has a rather small effect on bank lending to the real economy, and hence on aggregate investment and GDP. This result reflects the parallel impact of a CBDC on a central bank’s operational framework. For relatively moderate CBDC adoption levels, the reduction in deposits is absorbed by an almost one-to-one fall in reserves at the central bank, implying a transition from a ‘floor’ system – with ample reserves – to a ‘corridor’ system. For larger CBDC adoption, the loss of bank deposits is compensated by increased recourse to central bank credit, as the corridor system gives way to a ‘ceiling’ system with scarce reserves.