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TYPOMORPHIC CHARACTERISTICS OF ARSENOPYRITE IN GOLD DEPOSIT AND OCCURRENCE OF GOLD:A case study of gold deposits in Hunan Province

Bao Jue-min

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Abstract

As-bearing gold deposits in Hunan Province are broadly distributed,with large reserves and multiple types. The main As mineral is arsenopyrite,which in most of gold deposits contains Au (generally 120×10-6 to 250×10-6). The Au content in arsenopyrite is two to five times higher than that in the coexisting pyrite or more. The Au distribution rate in arsenopyrite is up to 64.3%-94.05% . The arsenopyrite was formed in two stages. It is chemically enriched in S and depleted in As,with rich Sb(Se),Ni and Co,poor Mn,and increased of unit cell parameter(a0). Most of the Au-bearing arsenopyrite contains invisible gold,which cannot be found even by electron microprobe. The invisible Au in arsenopyrite mostly occurs as nanometer fine grains.

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As-bearing gold deposits in Hunan Province are broadly distributed,with large reserves and multiple types. The main As mineral is arsenopyrite,which in most of gold deposits contains Au (generally 120×10-6 to 250×10-6). The Au content in arsenopyrite is two to five times higher than that in the coexisting pyrite or more. The Au distribution rate in arsenopyrite is up to 64.3%-94.05% . The arsenopyrite was formed in two stages. It is chemically enriched in S and depleted in As,with rich Sb(Se),Ni and Co,poor Mn,and increased of unit cell parameter(a0). Most of the Au-bearing arsenopyrite contains invisible gold,which cannot be found even by electron microprobe. The invisible Au in arsenopyrite mostly occurs as nanometer fine grains.

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Available abstract

As-bearing gold deposits in Hunan Province are broadly distributed,with large reserves and multiple types. The main As mineral is arsenopyrite,which in most of gold deposits contains Au (generally 120×10-6 to 250×10-6). The Au content in arsenopyrite is two to five times higher than that in the coexisting pyrite or more. The Au distribution rate in arsenopyrite is up to 64.3%-94.05% . The arsenopyrite was formed in two stages. It is chemically enriched in S and depleted in As,with rich Sb(Se),Ni and Co,poor Mn,and increased of unit cell parameter(a0). Most of the Au-bearing arsenopyrite contains invisible gold,which cannot be found even by electron microprobe. The invisible Au in arsenopyrite mostly occurs as nanometer fine grains.

Key concepts: Arsenopyrite, Pyrite, Electron microprobe, Geology, Mineral, Geochemistry, Mineralogy, Electron probe microanalysis

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TYPOMORPHIC CHARACTERISTICS OF ARSENOPYRITE IN GOLD DEPOSIT AND OCCURRENCE OF GOLD:A case study of gold deposits in Hunan Province — Research Paper | ScholarLens