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both high-grade and bulk tonnage Copper-Gold mineralisation. All holes intersected widespread, zoned skarn mineralisation, with hole VB 20-06 intersecting a weakly to moderately pyrite-pyrrhotite-magnetite impregnated intrusion of tonalitic composition with trace chalcopyrite.
Aug 07, 2020· Moreover, due to the typical high abundances of pyrite, chalcopyrite, and magnetite, copper skarns may be pinpointed by a magnetic high. On a deposit scale, instrumental methods, e.g. infrared spectroscopy and X-ray diffraction, can be used to identify the main mineralogy of skarn .
Gold ores in copper skarn . There is one style of high-grade gold mineralization in the skarn environment at Bingham: "Silica-pyrite Au-Ag ores". In contrast with the first categories, this ore type is relatively well-known (Cameron and Garmoe, 1987).
In copper skarns containing monticellite (e.g. Ertsberg, Irian Jaya, Indonesia, Kyle et al., 1991; Maid of Erin, British Columbia, Meinert unpub. data) bornite-chalcocite are the dominant Cu-Fe sulfides rather than pyrite-chalcopyrite. The largest copper skarns are associated with mineralized porphyry copper .
Skarn deposits are economically valuable as sources of metals such as tin, tungsten, manganese, copper, gold, zinc, lead, nickel, molybdenum and iron. [4] A skarn is formed by a variety of metasomatic processes during metamorphism between two adjacent .
Oct 01, 2002· 1. Introduction. Porphyry copper deposits contain up to 100 t of gold and are among the largest reservoirs of gold in the upper crust (Kerrich et al., 2000).They are commonly surrounded by deposits and country rock containing gold that is thought to have been derived from them (Jones, 1992).Gold can be removed from porphyry copper systems by vapors that separate at high .
The Mabilo copper-gold-magnetite skarn deposit is located in southern Luzon in the Paracale mineral district, where iron has been produced historically from several skarn deposits. Mabilo occurs in the south-west of the district and is distinct and significant because of its high grades of copper and gold compared to historical mines.
Gold property: 1) unweathered skarn, lo-cally rich in primary Fe-Cu sulfides and gold; 2) secondary chalcocite with subordi-nate native copper; and 3) Au-bearing, Fe-rich jasperoid. Most of the copper produc-tion to date has come from the chalcocite bodies, whereas most of the gold produc-tion has come from the primary sulfide and jasperoid zones.
overprinted by sericitic alteration. Minor gold along with molybdenite, some copper, and base-metal skarn mineralization occurred during this early event. A second mineralization event, which accounts for the bulk of the gold in the deposit is characterized by advanced argillic alteration, free gold, and abundant pyrite in the
Iron oxide copper gold ore deposits (IOCG) are important and highly valuable concentrations of copper, gold and uranium ores hosted within iron oxide dominant gangue assemblages which share a common genetic origin. These ore bodies range from around 10 million tonnes of contained ore, to 4,000 million tonnes or more, and have a grade of between 0.2% and 5% copper, with gold contents ranging ...
Nov 02, 2007· Copper is highest in garnet-rich skarn near the intrusive contact, whereas gold is concentrated in pyroxene-dominant skarn, particularly where the pyroxene is iron-rich (>Hd 50). Silver has elevated concentrations proximal to the stock and at the distal skarn front, beyond the main Fortitude gold zone (Kotlyar et al. 1998).
Zn:Au (<100) and Ag/Au (<1) ratios. Gold is commonly present as micron-sized inclusions in sulphides, or at sulphide grain boundaries. It is often associated with tellurides. To the naked eye, Au skarn ore is generally indistinguishable from waste rock. Magnesian Au skarns: Native gold ± pyrrhotite ± chalcopyrite ± pyrite
Jan 10, 2019· Moreover, due to the typical high abundances of pyrite, chalcopyrite, and magnetite, copper skarns may be pinpointed by a magnetic high. On a deposit scale, instrumental methods, e.g. infrared spectroscopy and X-ray diffraction, can be used to identify the main mineralogy of skarn .
Calcic iron skarn: iron, copper, cobalt, gold, and nickel. Magnesian iron skarn: iron, copper, zinc. Scapolite-(albite) iron skarn: iron, copper, zinc, lead, and arsenic, as well as trace amounts of cadmium. See tables 1-3 for geochemical analyses of magnetite skarn ore and associated rocks. Table 1 presents
to treat a high pyrite copper-gold skarn ore with signifi cant clay content, as described by Meka and Lane (2010). The plant was commissioned in 2008 for a capital cost of approximately $150 M, placing it in the lowest quartile for capital intensity for copper mineral processing projects.
The East and West copper-gold skarn orebodies were mined in the 1970s and the world-class Fortitude gold-silver skarn deposit was discovered north of the West orebody in late 1980. After three years of stripping and mining of the lower grade Upper Fortitude ore zone, production from the larger and richer lower Fortitude ore zone began in late ...
The Big Gossan Cu-Au skarn deposit is the highest grade copper deposit in the world-class Ertsberg district, Irian Jaya. Current reserves are 37.4 million metric tons (Mt), grading 2.69 percent Cu ...
Skarn deposits are economically important valuable sources, which metals such as tungsten, manganese, gold, copper, zinc, nickel, lead, molybdenum and iron. A skarn is formed by consists of various metasomatic processes during the metamorphism between two adjacent lithological units.
The East and West copper-gold skarn orebodies were mined in the 1970s and the world-class Fortitude gold-silver skarn deposit was discovered north of the West orebody in late 1980. After three years of stripping and mining of the lower grade Upper Fortitude ore zone, production from the larger and richer lower Fortitude ore zone began in late ...
Geographic coordinates: -117.26682, 40.70288 (WGS84) Elevation: 1520: Relative position: The Redline Skarn is part of the Converse Gold Property, which is located 180 km northeast of Reno, 18 miles (29 km) northwest of Battle Mountain, Nevada.
Aug 19, 2020· The high-grade copper-silver veins in skarn (chalcopyrite-bornite) suggests proximity to a porphyry copper system within the Erin zone. A 2.4 km long, structurally controlled Quartz vein system is located in the Lynx target, with gold values up to 37.6 g/t (1.2 oz/t).
Oct 17, 2019· This repeated hydrothermal activity stripped and transported copper and gold from the surrounding rocks and concentrated these elements within the top of the magma chambers where they were focused into the volcanic vents and along regional structures that formed the porphyry and skarn deposits. This was hot water, between 550-700 degrees ...
In contrast to the oxidised ore feed blend described above, when less than 20% pyrite skarn was contained in the ore blend, high copper and gold recoveries were achieved in the cleaner bank. Laboratory tests suggested that increasing cleaner feed pH from 10.5 to 11.5, and 1 or collector addition to the cleaner feed, would result in improved ...
4.0% Copper, 4.0 g/t Gold, 5.0% Zinc, 35 g/t Silver and 2.0% Lead. 4). The team has been very busy out in the field over the last three months and we are very excited about what we have managed to uncover. New, drill ready Copper-Gold skarn targets have been identified within 10km of the original discovery of skarn mineralisation
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