Results 181 to 190 of about 9,688 (230)

The Myszków Porphyry Copper-Molybdenum Deposit, Poland

International Geology Review, 1994
The porphyry copper-molybdenum deposit at Myszkow, south-central Poland, lies in the Cracow-Silesian orogenic belt, in the vicinity of a Paleozoic boundary between two tectonic plates.
M. A. Chaffee, R. G. Eppinger, Krzysztof Lason, Jadwiga Slosarz, Maciej Podemski   +4 more
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Origin of phenocrysts in mineralized porphyries of porphyry copper deposits

2005
The genetic mechanism of phenocrysts in mineralized porphyries of the Yulong porphyry copper deposit, Tibet, China, has been studied in the context of fluid inclusions in quartz and K-feldspar phenocrysts, phenocryst textures and mineral crystal textures.
Wenming Chen, Jifu Sheng
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Chapter 5 Porphyry Copper Deposits in China

2019
Abstract Porphyry Cu deposits in China contain a total resource of ~47 million tonnes (Mt) Cu at average grades ranging mostly from 0.2 to 0.7% Cu (most <0.5% Cu), accounting for 42% of China’s Cu reserves. In terms of contained Cu, 14 Cu-rich porphyry deposits are classified as giant (≥2.0 Mt Cu), and 38 are classified as ...
Zhiming Yang, David R. Cooke
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Metasomatic Zoning of Copper Porphyry Deposits in Kyrgyzstan

Proceedings, 2012
Крупнейшие в Кыргызстане месторождения золото-медно-порфирового типа находятся в Киргизском хребте в Северном Тянь-Шане (рис.1). На западе развиты медно-порфировые с золотом месторождения, формирование которых связано с ордовикскими островодужными обстановками (Андаш, Талды-Булак, Узунбулак, Каракол, Булакаши и др.).
N. Pak, E. Ivleva
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Hydrothermal alteration in the "porphyry copper" deposits

Economic Geology, 1947
The hydrothermal alteration, which was accompanied by the introduction of copper sulphides in the disseminated copper deposits, is considerably more complex than is generally recognized.Detailed microscopic study of selected porphyry specimens from the important deposits in the United States, together with a review of published data, leads to the ...
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Malanjkhand: Proterozoic Porphyry Copper Deposit, M.P. India

Journal Geological Society of India, 1989
Abstract The Malanjkhand porphyry copper deposit is estimated to contain 789 million tonnes averaging 0.83% Cu @ cut-off-grade of 0.20% Cu, 0.004wt% Mo, 0.2 gm/T Au, 6 gm/T Ag. 448 million tonnes 0.84% Cu (millhead grade) are available for open pit mining to a depth of 100 MRL.
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Optimal magmatic oxidation conditions for giant porphyry copper deposits

Science Bulletin
It is widely accepted that moderately to highly oxidized magmas are needed to form porphyry copper deposits (PCDs). However, only a few studies have attempted to investigate the effects of variable magmatic fO2 values on the formation of PCDs. Based on previously published studies, the magma oxygen fugacity of giant PCDs is mainly concentrated between ...
Dian-Zhong, Wang, Jing-Jing, Zhu, Ruizhong, Hu, Massimo, Chiaradia, Xianwu, Bi, Ming-Liang, Huang   +5 more
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Bubbling Magma Chambers, Cupolas, and Porphyry Copper Deposits

International Geology Review, 2001
Porphyry copper deposits are the major source of copper and significant sources of molybdenum, gold, and other metals. They are associated with the near-surface intrusion of small stocks of intermediate composition. They can form when H2O-unsaturated magma is emplaced into wall rock that is cool enough that steep lateral thermal gradients create a ...
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The porphyry copper deposit at La Granja, Peru

Economic Geology, 1982
Likhachev, A. P., 1975, Redeposition of ore-producing and petrogenetic components by aqueous solutions: Geochemistry Internat., v. 12, p. 101-115. Lindgren, W., 1955, Mineral deposits 4th ed.: New York, McgrawHill Co., p. 119-122. Park, C. F., Jr., 1955, The zonal theory of ore deposits: Eco•. GEOL., FIFTIETH ANNIV. VOL., p. 226-248. Spurr, J. E., 1907,
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Computerized grade control in complex porphyry copper deposits

Geological Society, London, Special Publications, 1992
Abstract Grade distribution within porphyry copper deposits can sometimes be erratic in nature. Conventional, manual grade control techniques for open pit mining have proved to be inadequate for accurately predicting mining head grades and for delineating ore and waste contacts. This paper describes a highly interactive computerized
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