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24/08/2009· The presence of andradite garnet suggests skarn mineralization in a relatively oxidizing environment (Kwak & Tan, 1981). Those processes may have generated the calcic‐exoskarn deposit surrounding the gold‐rich Batu Hijau porphyry copper deposit.
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Within the marble strata, there are three mineralized orebodies, of which the Panulcillo copper deposit is the most important (González, 1954). It is composed predominantly of garnet skarn impregnated with sulfide
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(Local) There is a general zonation of calc-silicate minerals around the intrusion that corresponds to the metal zonation in the skarn deposits. In the copper-gold-skarn zone near the contact, the skarn minerals consist of garnet plus chalcopyrite with relatively minor pyroxene, while farther away from the contact, in the gold-silver zone, skarn ore consists of pyroxene plus pyrrhotite with relatively minor garnet.
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Gold-bearing copper skarn deposits in the Orogrande and New Placers (San Pedro) districts are associated with the middle Tertiary intrusive systems that may also host Cu-Au porphyry deposits or alkaline Au-Te deposits. No examples are known that are related to calc-alkaline intrusions.
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Copper porphyry and skarn deposits have numerous alteration and rock forming minerals with absorption features in the long wave infrared (LWIR). Airborne visible-near infrared (VNIR) – short wave infrared (SWIR) imaging spectrometers can remotely map many of the minerals associated with propylitic, argillic, phyllic, and potassic alteration.
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01/09/2013· 1. Introduction. Skarn deposits are widely distributed around the world, and they contain ores of considerable industrial significance with deposits of iron, tungsten, copper, lead, zinc, molybdenum, silver, gold, uranium, rare-earth elements, fluorine, boron, and tin (Meinert et al., 2005).Skarn-type copper deposits are considered to be the most abundant skarn-deposit type in the
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Copper porphyry and skarn deposits have numerous alteration and rock forming minerals with absorption features in the long wave infrared (LWIR). Airborne visible-near infrared (VNIR) – short wave infrared (SWIR) imaging spectrometers can remotely map many of the minerals associated with propylitic, argillic, phyllic, and potassic alteration.
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The Tunaberg copper deposits, SE Bergslagen, Central Sweden, locally contain tellurium and selenium minerals not previously reported from this locality. Hessite, tellurobismutite, tellurium, tetradymite, kawazulite, clausthalite and selenian galena are found as inclusions in bornite and chalcopyrite in a skarn sulphide ore with Cd-rich sphalerite, cobaltite and cobalt pentlandite (assemblage A
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This deposit is atypical of skarns and may represent a distinct, but related type of disseminated gold deposit in contact metamorphosed rocks.Although many skarn minerals are typical rockforming minerals, some are less abundant and most have compositional variations which can yield significant information about the environment of formation Some
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and scheelite from the Naganobori copper skarn deposits, accompanying major chalcopyrite and pyrrhotite, and mi-nor bornite, sphalerite, galena, and magnetite. However, the occurrences of the Bi–,Ag–, and Co–minerals in the Naganobori copper skarn deposit have not been described in detail. Nagashima et al. (2016) studied ore and skarn
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The scarcity of pyroxene skarn is commonly observed also at the other skarn copper deposits in the Lambert-Panulcillo belt. On the other hand, such Mg-rich skarn minerals as phlogopite and clintonite, which are not observed in the other deposits, occur in the Panulcillo deposit.
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of deposits. Examples include some of the Malaysian tin skarns, calcic zinc skarns in New Mexico, copper skarns at OK Tedi, Papua, New Guinea and Craigmont, British Columbia (Ray and Webster, 1990). Potential environmental considerations Magnetite is the principal ore mineral in iron skarns.
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major skarn deposits are thought to be related to hydrothermal systems (Einaudi and others, 1981). Skarns can be barren or contain metals with economic value. Skarn deposits are important sources of base and precious metals as well as tin, tungsten, and iron. Skarns are relatively high-temperature mineral deposits related to magmatic-
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Keywords: Batu Hijau porphyry Cu-Au deposit, calc-silicate, Indonesia, skarn, Sumbawa. 1. Introduction The Batu Hijau porphyry Cu-Au deposit is situated in the south-western part of Sumbawa Island, Indone-sia (Fig. 1). 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
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23/11/2010· The skarn minerals are garnet, diopside, actinolite, epidote, quartz and calcite. The skarn rocks also occur along the ENE-striking faults. There are three main orebodies in the Dapingliang Cu deposit, which are L7, L2 and L6 (Fig. 2; Table 1), among which the L7 orebody is mined. The L7 orebody is in the skarn between plagiogranite and marble.
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Skarn in the Yongping deposits has a general spatial zonation-within the contact zone between skarn and marble. From the pluton to wall rock, the content of garnet decreases, and its color changes
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Keywords: Batu Hijau porphyry Cu-Au deposit, calc-silicate, Indonesia, skarn, Sumbawa. 1. Introduction The Batu Hijau porphyry Cu-Au deposit is situated in the south-western part of Sumbawa Island, Indone-sia (Fig. 1). 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
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Almost all skarn minerals in these deposits can be enriched in manganese including garnet, pyroxene, olivine, ilvaite, pyroxenoid, amphibole, chlorite, and serpentine.
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Gold-bearing copper skarn deposits in the Orogrande and New Placers (San Pedro) districts are associated with the middle Tertiary intrusive systems that may also host Cu-Au porphyry deposits or alkaline Au-Te deposits. No examples are known that are related to calc-alkaline intrusions.
Get Price
(Local) There is a general zonation of calc-silicate minerals around the intrusion that corresponds to the metal zonation in the skarn deposits. In the copper-gold-skarn zone near the contact, the skarn minerals consist of garnet plus chalcopyrite with relatively minor pyroxene, while farther away from the contact, in the gold-silver zone, skarn ore consists of pyroxene plus pyrrhotite with
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