Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy最新文献_第6页

Luzonite and associated Cu-excess tennantite from the Levant Sn–Cu deposit, Cornwall, England: Evidence for a high sulphidation hydrothermal event 英国康沃尔郡Levant Sn–Cu矿床中的绿泥石和伴生的Cu过量tennante：高硫化热液事件的证据

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-02-28 DOI: 10.1080/25726838.2021.1888614

B. Grguric, M. Roberts, M. Raven, Kendal Martyn

{"title":"Luzonite and associated Cu-excess tennantite from the Levant Sn–Cu deposit, Cornwall, England: Evidence for a high sulphidation hydrothermal event","authors":"B. Grguric, M. Roberts, M. Raven, Kendal Martyn","doi":"10.1080/25726838.2021.1888614","DOIUrl":"https://doi.org/10.1080/25726838.2021.1888614","url":null,"abstract":"ABSTRACT Luzonite, partially replaced by tennantite, was identified in dump specimens from the historic Levant Mine, west Cornwall, in a paragenetic sequence comprising early cassiterite–quartz–pyrite–arsenopyrite overprinted by Cu–Fe sulphides and followed by luzonite and tennantite. Mineral chemical data indicates the luzonite is near-end member and the tennantite is so-called Cu-excess tennantite, the implication being its Fe content (2.01–4.04 at.-%) is present entirely as Fe3+ in the sulphide lattice. Both the luzonite and its replacement product, Cu-excess tennantite, indicate that at least one hydrothermal episode in the long-lived Levant mineralising system involved influx of oxidised, high-intermediate sulphidation fluids. The presence of fine bornite and covellite lamellae in Cu-excess tennantite are interpreted to be post-depositional exsolution products. The luzonite has a sulphur isotope δ 34S of 0 ± 0.3 ‰ and it is tentatively proposed that the luzonite–tennantite depositing event represented a pulse of essentially pure magmatic-hydrothermal fluid.","PeriodicalId":43298,"journal":{"name":"Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy","volume":"130 1","pages":"107 - 113"},"PeriodicalIF":1.0,"publicationDate":"2021-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/25726838.2021.1888614","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49427683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boundary simulation – a hierarchical approach for multiple categories 边界模拟——适用于多个类别的分层方法

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-02-19 DOI: 10.1080/25726838.2021.1889295

Flavio Azevedo Neves Amarante, Roberto Mentzingen Rolo, J. F. Coimbra Leite Costa

{"title":"Boundary simulation – a hierarchical approach for multiple categories","authors":"Flavio Azevedo Neves Amarante, Roberto Mentzingen Rolo, J. F. Coimbra Leite Costa","doi":"10.1080/25726838.2021.1889295","DOIUrl":"https://doi.org/10.1080/25726838.2021.1889295","url":null,"abstract":"ABSTRACT Geological modelling is a crucial step in mineral resource evaluation. The traditional approach to modelling the volumetric limits, explicit modelling, presents a series of limitations and disadvantages which makes it costly to assess the uncertainty in relation to the location of the limits between different domains in the mineral deposit. In many cases, the geological model can be a source of crucial uncertainty, for this reason, the uncertainty associated with the geological model must be assessed. This paper proposes a method for assessing geological model uncertainty by simulating the contacts between different domains in a mineral deposit in a hierarchical manner using signed distances. The proposed method was demonstrated in a case study conducted on a porphyry copper deposit. Models generated by the proposed method do not show much noise, as this method leads to continuous contacts between domains while the volume variation and contacts characteristics can be controlled by the parameters. Results are compared to sequential indicator simulation, a traditionally used technique to model geobodies and assess its uncertainty.","PeriodicalId":43298,"journal":{"name":"Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy","volume":"130 1","pages":"114 - 130"},"PeriodicalIF":1.0,"publicationDate":"2021-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/25726838.2021.1889295","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49581613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Editorial 社论

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Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-01-02 DOI: 10.1080/25726838.2021.1891653

S. Jowitt

引用次数: 0

Geometallurgical characterisation of Mn ores 锰矿的地质冶金特征

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-01-02 DOI: 10.1080/25726838.2020.1863013

M. Peterson, J. Manuel, S. Hapugoda

引用次数: 1

Mineralogical and geochemical characterisation of kaolin deposit from Debre Tabor area northwestern, Ethiopia 埃塞俄比亚西北部Debre Tabor地区高岭土矿床的矿物学和地球化学特征

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-01-02 DOI: 10.1080/25726838.2021.1872820

Alemu Mesele, Teklay Gidey, Tilahun Weldemaryam, Wuletaw Mulualem, T. Mekuria, Y. Ali, Gizachew Mulugeta, Betelhem Tesfaye, Mulgeta Brihan

{"title":"Mineralogical and geochemical characterisation of kaolin deposit from Debre Tabor area northwestern, Ethiopia","authors":"Alemu Mesele, Teklay Gidey, Tilahun Weldemaryam, Wuletaw Mulualem, T. Mekuria, Y. Ali, Gizachew Mulugeta, Betelhem Tesfaye, Mulgeta Brihan","doi":"10.1080/25726838.2021.1872820","DOIUrl":"https://doi.org/10.1080/25726838.2021.1872820","url":null,"abstract":"ABSTRACT Debre Tabor kaolin deposit is located around Debre Tabor town in Amhara region of northwestern Ethiopia. The kaolin deposit in the study area needs a detailed study to evaluate the geological, mineralogical, physical, and geochemical conditions. For this purpose, detailed geological, physical, mineralogical, and geochemical laboratory tests were performed. XRD and petrographic analysis were used to study the mineralogical composition. Geochemical analysis was determined using ICP-MS and ICP-AES. The Debre Tabor kaolin deposit is exposed along riverbanks, road cuts, hillside, and quarry sites. The laboratory results reveal that the deposit is formed from the weathering of felsic rocks mainly trachyte and tuff units. From the laboratory analysis, we found that quartz is the dominant impurities. The geological, mineralogical, and geochemical studies indicate that in situ weathering followed by leaching played a major role in the formation of the Debre Tabor kaolin deposit. The average Chemical Index of Alteration (77.98%) shows that the host rock has experienced moderate weathering and alteration under the hot and humid climatic conditions of the subtropical zone. The low bulk density (1.54 g cm−3) and Ce + Y + La vs. Ba + Sr plot correspond to the supergene type of formation. Based on the mineralogical, geochemical, and physical properties, Debre Tabor kaolin deposit can be used for refractory, ceramics, paper coating, and filler (paint) industries, but treatment is important to remove the existing impurities such as iron, quartz, and feldspars.","PeriodicalId":43298,"journal":{"name":"Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy","volume":"130 1","pages":"42 - 56"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/25726838.2021.1872820","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41656429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Grade estimation by a machine learning model using coordinate rotations 使用坐标旋转的机器学习模型进行等级估计

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-01-02 DOI: 10.1080/25726838.2021.1872822

Gamze Erdogan Erten, M. Yavuz, C. Deutsch

引用次数: 2

Geochemical, mineralogical and macroscopic facies of the Fongo-Tongo bauxite deposit western Cameroon 喀麦隆西部Fongo-Tongo铝土矿床的地球化学、矿物学和宏观相

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2021-01-02 DOI: 10.1080/25726838.2020.1861916

Franck Wilfried Nguimatsia Dongmo, R. Yongue Fouateu, Roger Firmin Donald Ntouala, Y. B. Lemdjou, Dongmo Chirstophe Ledoux, A. Bolarinwa

{"title":"Geochemical, mineralogical and macroscopic facies of the Fongo-Tongo bauxite deposit western Cameroon","authors":"Franck Wilfried Nguimatsia Dongmo, R. Yongue Fouateu, Roger Firmin Donald Ntouala, Y. B. Lemdjou, Dongmo Chirstophe Ledoux, A. Bolarinwa","doi":"10.1080/25726838.2020.1861916","DOIUrl":"https://doi.org/10.1080/25726838.2020.1861916","url":null,"abstract":"ABSTRACT The Fongo-Tongo’s bauxites were investigated to characterise them. Their texture varies from massive, vesicular, alveolar, conglomeratic to nodular with dominantly red colour, reddish-brown and yellow. The main minerals identified by X-ray diffraction are gibbsite and goethite with subordinate quartz, anatase, hematite, magnetite, and traces of kaolinite. The abundance of gibbsite and goethite suggested intense weathering during the formation of the bauxite deposits. Chemical data of the bauxite showed high Al2O3 (37.4–57.5 wt-%) with varied Fe2O3 (3.97–29.5 wt-%), TiO2 (0.57–7.5 wt-%) and SiO2 (0.48–3.21 wt-%) contents, while other oxides are generally less than 0.6 wt-% indicating high bauxite quality with low impurities. The wide range of trace and REE concentrations of Zr, Nb, Sr, V, Ce, La, Nd and the presence of both positive and negative Eu anomalies suggested and acid igneous source with mafic input. These bauxites could serve as raw material for the aluminium industry.","PeriodicalId":43298,"journal":{"name":"Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy","volume":"130 1","pages":"23 - 41"},"PeriodicalIF":1.0,"publicationDate":"2021-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/25726838.2020.1861916","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44678510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Correction 修正

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2020-10-01 DOI: 10.1080/25726838.2020.1852999

引用次数: 0

BIF-hosted deposit unit differentiation using multivariate Gaussian processes on measure while drilling data 在随钻测量数据上使用多元高斯过程的BIF托管矿床单元微分

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2020-10-01 DOI: 10.1080/25726838.2020.1829253

Katherine L. Silversides, A. Ball, A. Melkumyan

{"title":"BIF-hosted deposit unit differentiation using multivariate Gaussian processes on measure while drilling data","authors":"Katherine L. Silversides, A. Ball, A. Melkumyan","doi":"10.1080/25726838.2020.1829253","DOIUrl":"https://doi.org/10.1080/25726838.2020.1829253","url":null,"abstract":"ABSTRACT Measure while drilling (MWD) data collected from production holes can provide information on the location of stratigraphic units in banded iron formation-hosted iron ore deposits. Stratigraphic modelling in these deposits is typically based on data from exploration holes, and adding more densely spaced production data can potentially increase model detail at the bench scale. Previous MWD classification methods struggle to differentiate between neighbouring ore units. In this paper, multivariate Gaussian Processes (GPs) were applied to locate the contact between two iron ore units in the Dales Gorge Member in the Brockman Iron Ore Formation. Production MWD points were then labelled based on the GP output. By altering parameters of the labelling process, 24.4–49.4% of the test data were labelled, with accuracies from 81.4 to 86.8%. Classifications from the same hole were compared to ensure MWD label consistency. The results demonstrate that the proposed method can improve geological unit classification from MWD data.","PeriodicalId":43298,"journal":{"name":"Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy","volume":"129 1","pages":"164 - 175"},"PeriodicalIF":1.0,"publicationDate":"2020-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/25726838.2020.1829253","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47575259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Editorial 编辑

IF 1

Applied Earth Science-Transactions of the Institutions of Mining and Metallurgy Pub Date : 2020-10-01 DOI: 10.1080/25726838.2020.1847985

S. Jowitt

引用次数: 0