bodies are very large, generally containing from 100 million to several billion tons of copper ore with a copper content of 0.2% to 2.0%. The majority of porphyry copper deposits occur adjacent to subduction zones (i.e. Ring of Fire around the Pacific Ocean), which form along continental margins (i.e. Andes Mountains) and island
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Oct 17, 2019· Most of the world’s copper is extracted from a type of mineral deposit called a “porphyry copper”. If you’ve seen a picture of a great big open-pit mining operation odds are that it was a porphyry copper deposit. Some of the biggest man-made holes in the ground are porphyry copper mines: Bingham Copper Mine, Utah, and Chuquicamata in Chile, and two of the largest.
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Ore-grade hypogene mineralization is restricted to the porphyry and to a narrow andesitic wall-rock contact zone. These copper centers occur within a broad zone (5X15 km) of pyritic mineralization, which is best developed in the Tertiary rhyolitic rocks.
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So how do we explore for Porphyry Copper Deposits which are completely covered by barren younger rocks? Well let’s back up a bit, we know that porphyries form under large subduction related volcanoes and that most of these are located under the ring of fire around the subducting pacific plate another fertile subduction zone occurs in Balkans, Turkey, Iran and Pakistan. So this gives us a ...
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Porphyry copper deposits and their relationship to felsic intrusions are of considerable economic as well as academic interest. They generally occur near continental margins and in island arcs. Although some conjecture exists as to the ultimate source of transition metals associated with the deposits, a growing body of evidence suggests the metals are principally derived from a magmatic source ...
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Porphyry deposits have several characteristics that make them attractive investments for major mining companies – companies which focus on profitability and mine life, not on grade. They can be gigantic – for example, as at 31 December 2011 Escondida had sulphide reserves of 4.9 billion tonnes at 0.71% copper and a staggering sulphide ...
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These are copper ore deposits associated with intrusive igneous rocks similar to granite. Porphyry describes the typical texture of these rocks, in which individual mineral grains about a tenth to a half inch in size are surrounded by smaller grains that are barely visible to the naked eye.
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alteration-mineralization in the porphyry Cu deposits is zoned upward from barren, early sodic-calcic through potentially ore-grade potassic, chlorite-sericite, and sericitic, to advanced argillic, the last of these constituting the lithocaps, which may attain >1 km in thickness if …
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Porphyry copper deposits (and their close relatives, porphyry molybdenum deposits) contain disseminated mineralization, meaning that a large volume of shattered rock contains a ramifying network of tiny quartz veins, spaced only a few centimetres apart, in which grains of the copper ore minerals chalcopyrite and bornite (or the molybdenum ore ...
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Although Mo is not recovered (or reported) from porphyry Cu-Au deposits of the Macquarie arc, the Spinifex Ridge deposit contains a JORC-compliant ore reserve totalling 0.295 Mt Mo (and 0.520 Mt Cu: Table 2.2.1), the largest Mo resource in Australia.
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Porphyry ore deposits typically form in convergent plate margin or postsubduction settings at depths of 1-6. km. Oxidized hydrous melts derived from the metasomatized mantle wedge transport Cu, Au ...
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Nov 25, 2020· Deposit sizes range from 100 million to 5 billion tonnes of ore with grades that are typically in the 0.2% to 1% copper range. Virtually all significant copper mines in the Quesnel Trough consist of multiple porphyry centres and Kodiak has defined three copper porphyry zones but believe there are more to discover.
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Nov 29, 2020· Large copper–gold porphyry systems have often been referred to as ‘elephants’. This is based on the massive size of these ore bodies, and also takes into account that the Papuan Mobile Belt, where Gold Mountain is exploring, is no stranger to elephants – including world-class mines such as Grassberg, Ok Tedi and Panguna.
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Oct 21, 2020· The ore in copper porphyry deposits is usually located between the potassic and phyllic alternations. There is a pyrite halo surrounding the ore. Chlorite, calcide, epidote, and adularia are ...
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The general attributes of porphyry copper deposits are summarized below. Brief Description In hypogene parts of porphyry copper deposits, the copper occurs predominantly in chalcopyrite; other important copper ore minerals may include bornite and enargite. Ore minerals occur as disseminations and in stockworks of veins in hydrother-
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Oct 17, 2019· Ore Minerals. Copper in these deposits generally occurs in copper-iron sulfide minerals such as chalcopyrite (CuFeS 2) and bornite (Cu 5 FeS 4). Brassy-yellow Chalcopyrite is the primary copper-bearing mineral in Porphyry deposits. It can be …
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Understanding Geology of Porphyry Copper Deposits and formations using models around the World. Porphyry Copper Deposits are the largest source of Cu/Mo/Au.
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Aug 01, 2020· Monecke et al. (2018) for example, suggest that ore formation occurred in porphyry copper deposits at <400 °C based on the incorrect presumption of the upper temperature for brittle failure of rocks (Fournier, 1999). This is a false assumption that is not sustained by fluid inclusion data as discussed above.
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Mar 11, 2015· Large Size, Low Grade – Porphyries typically have 100 million to 5 billion tonnes of ore with a lower grade (0.2% to >1% copper). It is the size of these deposits that allow for bulk mining and economies of scale. Long Mine Life – The size of porphyry systems usually mean that the life of the mine can be multi-decades long. This means that ...
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Q. Theory of Ore Deposit Formation. R. Porphyry Copper Exploration and Resource Assessment Guides. S. Geoenvironmental Features. T. Knowledge Gaps and Future Research Directions. U. Broader Implications and Societal Relevance of Porphyry Copper Systems. References Cited. Appendix 1. Grade and tonnage models. Appendix 2.
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Comments: In ore: 0.002 g/t Pt, 0.007 g/t Pd. 30% covered. Surface disturbance about 5 square kilometers. Associated with Late Cretaceous subvolcanic bodies and porphyry dikes intruded into Cambrian metamorphic rocks and Carboniferous granodiorites.
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Porphyry copper mineral deposits are usually massive, with extraction taking place by open-pit mining. ... (VMS) ore deposits, a source of copper sulfide formed through hydrothermal events in ...
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Nov 01, 2020· Magmas with a high oxidation state (FMQ + 1 to + 2), a high-water content (≥4 wt% H 2 O) and a high degree of fractionation are necessary to form porphyry copper deposits (PCDs). Different proxies, such as Fe 3+ /Fe 2+ ratio of whole-rock, minerals indicative of high oxygen fugacity (fO 2) and water content as well as geochemical signatures of whole-rock (e.g. high Sr/Y and V/Sc ratios) are ...
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Porphyry copper, skarn and epithermal ore deposits are the most common type of hydrothermal ore deposits. They are genetically linked to convergent tectonic margins characterized by calcalkaline magmatism. Porphyry copper deposits originate in or nearby porphyritic intrusives which were saturated by water as they intruded in shallow areas of ...
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Porphyry deposits are one of the most important sources of copper and molybdenum, and are also major sources of silver, gold, and tin.In addition, porphyry deposits may host valuable by-products ...
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![[Pdf] Porphyry Copper Deposit Model: Chapter B In Mineral ...](/picture/mining/90.jpg)
DOI: 10.3133/SIR20105070B Corpus ID: 129115356. Porphyry copper deposit model: Chapter B in Mineral deposit models for resource assessment @article{Ayuso2010PorphyryCD, title={Porphyry copper deposit model: Chapter B in Mineral deposit models for resource assessment}, author={R. A. Ayuso and M. Barton and R. Blakely and R. Bodnar and J. Dilles and F. Gray and Fred T. Graybeal …
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Porphyry deposits typically contain hundreds of millions of tonnes of ore. In porphyry Cu deposits, for example, Cu grades range from 0.2% to more than 1% Cu while in porphyry Au and Cu-Au deposits, Au grades range from 0.2 to 2 g/t Au.
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