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Grasberg is the world's largest gold-rich porphyry copper deposit and its mineral district also contains a number of large mineralized copper-gold skarns ... comprising the Grasberg copper-gold porphyry and Kucing Liar skarn deposits, contains 7.5 billion tons of in situ mineralization with a grade of 0.7% Cu and 0.64 ppm Au (Leys …
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The Yao'an gold deposit is located in the middle of the Jinshajiang-Ailaoshan alkali-rich metallogenic belt, and this belt hosts many porphyry-type Cu-Au-Mo deposits formed at 46–33 Ma. Yao'an porphyry gold-mineralization is intimately associated with biotite syenite porphyry, whereas the contemporaneous quartz syenite porphyry is …
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The porphyry-related, gold skarn district of Nambija has been one of the main gold producers of Ecuador with an estimated 62 t of gold extracted mostly by artisanal methods since the 1980s. Previous K–Ar dating (Prodeminca 2000) has yielded Late Jurassic to Early Cretaceous dates for skarn formation and Cu–Mo porphyry mineralization and
DetailsThe Ok Tedi copper-gold mine in Western Province, Papua New Guinea, is situated in the western part of the Ok Tedi Complex where monzodiorite to quartz monzonite intrusions are associated with porphyry- and skarn-style copper-gold mineralization. The Pleistocene age of the intrusive rocks and mineralization provides an opportunity to study the …
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The Tomboy—Minnie gold deposits are related to the middle Tertiary porphyry copper system centered at Copper Canyon. Gold-silver ores in the deposits occur mostly in a pyrrhotite- and pyrite-rich basal 30-m-thick sequence of altered calcareous conglomerate belonging to the Middle Pennsylvanian Battle Formation.
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Abstract. A broad spectrum of gold mineralization styles is found in the epizonal intrusive environment, and a number of these give rise to world-class gold deposits (Figure 6.1). Here the spectrum is subdivided into: (a) intrusion-hosted stockwork/disseminated deposits of both porphyry and non-porphyry types, the former possessing all the ...
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typical of porphyry copper environments (Burnham and Ohmoto, 1980). Therefore, any exsolved magmatic fluid associated with the Phu Lon plutons would have been oxidised potentially rich in sulphur, copper and even gold. These fluids would have been critical in forming the mineralised skarn at Phu h. Based on crosscutting
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The Beiya porphyry-skarn gold–polymetallic deposit at the northwestern part of the fragment may provide an important paleomagnetic result for understanding the deformation behavior of the CDF.
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The Beiya skarn gold deposit is located in the eastern Tethyan orogenic belt in western Yunnan province, China. It is one of the largest gold deposits in China, with significant amounts of silver and base metals. To the end of 2014, the estimated resources are 125 million tonnes (Mt) of ore, grading 2.42 g/t Au, 0.48 wt % Cu, 25.5 wt % Fe, …
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The Phu Kham copper-gold deposit is in the Lao People's Democratic Republic. The name translates literally as "Mountain of Gold". The deposit includes distal sulphide skarn, proximal silicate-oxide skarn and stockwork mineralisation styles that are spatially related to a series of intermediate porphyry dykes.
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Alkalic epithermal and porphyry gold deposits are dealt with as a separate gold deposit class owing to their specific host-rock association and element enrichment (e.g., Mo, F, Be, Hg, W, and Sn). ... This proximal skarn zone typically is zoned from garnet dominant close to the pluton or fluid pathway to pyroxene dominant away from the pluton ...
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West Africa, with presently an approximate 10,000-metric ton (t) gold endowment, is one of the world's great gold provinces and the largest Paleoproterozoic gold-producing region. The gold resources are concentrated within the 2250 to 2000 Ma greenstone belts of the Man-Leo shield, forming the southern part of the West Africa craton.
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The Beiya gold–polymetallic orefield, with gold reserves of 305 t, is one of the most representative porphyry-skarn orefields in the Jinshajiang–Ailaoshan Cu–Au ore belt within the Sanjiang region of southwest China.The orefield contains seven deposits: the Wandongshan, Hongnitang, Dashadi, Bijiashan, Weiganpo, Matouwan, and Bailiancun …
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The eastern segment of the orogeny ranks as the most important molybdenum repository in the world, with > 90% of the Mo metal was resourced from porphyry and porphyry-skarn deposits aged 160?105 ...
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† Note that skarn gold deposits are here considered to be a sub-type of the porphyry and RIRGS deposit groups because their formation is intimately associated with fluids derived from the intrusions interacting with …
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Common ore minerals of the porphyry gold – copper relate to skarn deposit at Phukham area are Chalcopyrite (CuFeS 2 ), Pyrite (Fe S 2 ), Galena (PbS), Sphalerite (ZnS), Bornite, Covellite ...
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1. Introduction. The Batu Hijau porphyry Cu-Au deposit is situated in the south-western part of Sumbawa Island, Indonesia ().The deposit contains 914 Mt of ore at an average grade of 0.53% Cu (10.58 billion pounds copper) and 0.40 g t −1 Au (11.8 million ounces gold). The Batu Hijau mine, since its discovery in 1990, has been investigated by many researchers …
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Astarghan deposit includes skarn, porphyry and epithermal mineralizations (Cu–Au).. Epithermal mineralization of Au in Astarghan shows low-sulfidation characteristics. • Tetrahedrite and stibnite are the main hosts for gold in the Astarghan deposit.. Native gold also occurs in epithermal quartz veins as tiny particles of 50–200 …
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The Tinga Valley Property is characterised by a drill ready, well-defined high-grade copper-gold porphyry and associated skarn exploration targets. Historical work has indicated the existence of ...
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Skarn deposits are not common in the Southwest Pacific Rim [2], but in Indonesia several significant copper gold deposits associated with porphyry systems such as Gunung Bijih, Ertsberg [3], and ...
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The Hewan granite porphyry, located north of the Trans-North China Orogen (TNCO), is a recently discovered large porphyry gold deposit. One of its unique features is that it is a strongly differentiated, high-silica granite (SiO 2 > 70%) ( Lee and Morton, 2015 ) in which biotite and amphibole are absent.
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Although usually treated as separate to the adjacent porphyry copper-gold (Cu-Au) deposit, skarns near porphyry deposits are commonly inextricably part of the larger Cu-Au system(s).
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Although formerly regarded as a porphyry copper belt, a typical porphyry–skarn copper–gold belt, or porphyry copper skarn system as classified by Meinert (1989), the Tibet–Sangjiang region may be an important skarn gold belt. The Central China Orogen, contains the Baxi, Deerni, Saishitang, Yemaquan, Kendekeke …
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The porphyry-type gold (copper) and skarn iron-gold ore bodies are delineated at the southern side of the Long Vi intrusion. The porphyry gold ore body is controlled by a joint-fissure zone with a length of 200–300 m and a thickness of 10–50 m. Its distribution is closely related to finely fragmented granular quartz veins and branching …
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The former mainly includes magmatic Cu–Ni (Kalatongke), porphyry Cu (Mo–Au), skarn Cu–Mo and Fe, iron oxide–copper–gold (IOCG), intrusion-related Au–Cu–Co, epithermal Au, greisen–quartz vein Sn, and graphite deposits, while the latter largely includes orogenic Au deposits.
DetailsThis is seen in data for the main ore types in the Bingham district: ( 1 ) copper-molybdenum-gold stockwork ore, (2) copper-gold skarn, and ( 3 ) zinc-lead-silver-gold manto ore. The in situ grade of porphyry ore mined at Bingham has been in the range of 0.7 to 0.8% Cu and 0.5 ppm Au (James, 1978; J. Black, pers. commun., 1990), …
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Volcanics and limestones exposed at surface, suggesting the porphyry intrusion lies at depth. High-grade skarns grading up to 21% copper, 4.5 g/t gold and 1,085 g/t silver (skarn occurs when ...
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The McCoy gold skarn is only 45 km southwest of the reduced Fortitude gold skarn in northcentral Nevada, but differs dramatically in regards to the style of mineralization and wallrock alteration. The McCoy deposit contains 15.6 Mt of ore averaging 1.44 g/t Au and an additional 30,430 tonnes averaging 14.6 g/t Au that was mined …
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The Beiya skarn gold deposit is located in the eastern Tethyan orogenic belt in western Yunnan province, China. It is one of the largest gold deposits in China, with significant amounts of silver and base metals. To the end of 2014, the estimated resources are 125 million tonnes (Mt) of ore, grading 2.42 g/t Au, 0.48 wt % Cu, 25.5 wt % Fe, 38. ...
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