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Transitions between porphyry copper deposits and highsulfidation epithermal gold deposits also have been proposed (Sillitoe, 1973, 1983, 1988, 1989; Wallace, 1979; Heald et al., 1987; Rye, 1993), and recent studies of the Lepanto highsulfidation goldcopper and adjacent Far Southeast porphyry coppergold deposits (Arribas et al., 1995 ...
Howell and Molloy (1960) described El Teniente as "a model porphyry copper deposit" with "a circular configuration of alteration" and mineralization "arrayed concentrically around a common center." They suggested that mineralization in El Teniente was emplaced around the barren core of the Teniente Dacite Porphyry intrusion
The Rosia Poieni deposit is a porphyry copper system with a highsulfidation epithermal overprint. The system is about 3 Ma younger than the neighboring Rosia Montana epithermal deposit. Hydrothermal alteration and mineralization of this porphyry CuAu(Mo) deposit are genetically related to the Middle Miocene shallowlevel emplacement of a ...
Classified as porphyry copper with gold mineralization described by Torrey and White (1998). Central zone of elevated Cu, Mo, peripheral gold halo, and outer zincrich zone. Concentric, porphstyle potassic, phyllic, propylitic alteration; NWzone of sheeted quartz veins stockwork of barren qtz veinlets. Late radial qtzcarbonateAu veins.
This result suggests that in composite intrusives the more aluminous ones are better targets for porphyry mineralization and that early formed ferromagnesian minerals from mineralized intrusives should be copper deficient compared to barren systems (Kesler et al., 1975a).
Sep 08, 2018· Chalcophile element fertility, the chalcophile metal abundance in the source magma, is likely to be a critical factor for the formation of porphyry Cu ± Au deposits. In this study, we provide evidence to support this hypothesis by comparing the platinum group element (PGE) geochemistry of barren and orebearing Cu ± Au granitic suites. We report the PGE contents of three barren volcanic .
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 ...
Porphyry deposits are usually thought to form from subductionrelated calcalkaline magmas in magmatic arc settings, although some porphyry deposits also occur in postcollisional extensional settings. The postcollisional deposits remain poorly understood. Here we describe the igneous geology, alteration mineralogy and mineralization history of Qulong, a newlydiscovered porphyry Cu–Mo ...
Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name. In later stages, circulating meteoric fluids may interact with the magmatic ...
Pebble Mine is the common name of a very large porphyry copper, gold, and molybdenum mineral deposit in the Bristol Bay region of Southwest Alaska, near Lake Iliamna and Lake Clark. As of August 2020, mine developers are seeking federal permits from the Army Corps of Engineers, the Coast Guard and the Bureau of Safety and Environmental Engineering.
Porphyry Copper Systems* ... alterationmineralization in the porphyry Cu deposits is zoned upward from barren, early sodiccalcic through potentially oregrade potassic, chloritesericite, and sericitic, to advanced argillic, the last of these constituting
Apr 30, 2020· Porphyry Cu deposits in China contain a total resource of ~47 million tonnes (Mt) Cu at average grades ranging mostly from to % Cu (most <% Cu), accounting for 42% of .
45 km). Porphyry copper deposits (PCDs) represent shallow level intrusions (2–5 km) in the crust. Mineralization of Cu ores tend to occur at the tops of porphyry systems in cupolas. Possible regimes where Cu may be mobilized include hydrothermal circulation at .
Nov 01, 2014· The closure of the Neotethyan ocean and prevailing collisional tectonics during Tertiary times generated a highly fertile metallogenic environment with abundant porphyry copper deposits in the Urumieh–Dokhtar magmatic belt clustering in narrow arc segments, typically a few tens of kilometers wide (, Agard et al., 2005, McInnes et al., 2005, Shafiei et al., 2009, Dargahi et al., 2010 ...
styles including lithocaps or barren shoulders, steam heated, magmatic solfatara and acid sulphate alteration. INTRODUCTION This paper is a work in progress based upon my experiences in the exploration for, and evaluation of, magmatic arc epithermal gold and porphyry copper gold deposi ts (Figure 1). It therefore draws upon,
The Escondida porphyry copper deposit, located in northern Chile, was one of the two largest copper producers of the world in the 1990s. The hydrothermal evolution of this deposit is associated ...
phyry Cu mineralization at the Mamut deposit are compared to those from the barren intrusives in the Mount Kinabalu area in order to discuss the genesis of the Mamut deposit. These rocks studied exhibit broadly similar petrologic features,, rich in K, and thus presumably have Genesis of the Mamut Porphyry Copper Deposit, Sabah, East Malaysia
Many porphyry copper deposits in the central Andes were formed during uplift resulting from the crustal shortening and thickening that accompanied compressive tectonism (, Maksaev and Zentilli, 1999; Perelló et al., 2003b; Sillitoe and Perelló, 2005; Maksaev et al., 2009) and, as a consequence, are likely to have been rapidly exhumed ...
ASXlisted Hot Chili cant put a foot wrong, with its ongoing drill program continuing to deliver blistering numbers from the Perth based company''s Cortadera porphyry coppergold project in Chile. Latest results include 542 metres grading % copper and grams per tonne gold from 422m at the Cupero 3 deposit. The most recent drill hits have extended the deposit''s high grade core to well ...
Comparison of the trace element concentrations of white micas from the early phyllic style from the barren system of Grasshopper and the mineralized system of Copper Cliff indicates significant differences in Zn, Cr, B, Tl, Sn, and Cs.
Mar 01, 2020· When it comes to porphyry deposits, size counts. These multigenerational monsters are responsible for ~60 per cent of the world''s copper, most of its molybdenum, and significant amounts of gold and silver. Their easymining large volumes make up for the low grades, typically between per cent to 1 per cent copper equivalent. But these [.]
Zircons are a useful tool for distinguishing metalfertile from barren plutons when exploring for porphyry copper deposits, particularly in British Columbia where many porphyry systems occur within or proximal to the edges of large batholiths.
alkaline magmas are relatively common, large porphyry copper deposits are extremely rare and increasingly difficult to discover. Here, we compile existing geochemical data for magmatic plagioclase, a dominant mineral in calcalkaline rocks, from fertile and barren magmatic systems worldwide, barren examples having no associated porphyry deposit.
potentially related to porphyry copper mineralization at depth. Conceptually (Sillitoe, 2010), there is a possibility of porphyry copper deposits existing beneath the lithocaphosted Nansatsutype gold deposits. This spatial and temporal connection between porphyry .
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