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Skarn gold mineralization at the Geodo Mine, South Korea

Citation

Kim, E-J and Park, M-E and White, NC, Skarn gold mineralization at the Geodo Mine, South Korea, Economic Geology, 107, (3) pp. 537-551. ISSN 0361-0128 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 Society of Economic Geologists, Inc

DOI: doi:10.2113/econgeo.107.3.537

Abstract

The Geodo Bi-Te-bearing skarn deposit is located in the Taebaeksan mining district, South Korea. Both endoskarn and exoskarn are associated with the Cretaceous Eopyeong granitoids, which consist of magnetitebearing oxidized (Fe2O3/FeO > 0.4) quartz monzodiorite to monzodiorite.

Gold in the Geodo Mine occurs in a retrograde alteration stage within a garnet-rich proximal zone. Skarn minerals associated with gold ore include Fe-rich garnet (Ad57-95Gr1-41) and a wide range of clinopyroxene (Hd 20-100Di 0-79) compositions, broadly similar to those of typical gold-bearing skarn deposits. The paragenetic stages of the Bi- and Te-bearing skarn in the Geodo Mine consist of early calc-silicate alteration followed by three mineralization stages: Fe oxide, Cu rich, and Au rich. The Fe oxide and Cu-rich stages were deposited at higher temperatures than the Au-rich stage, based on mineral assemblage stabilities. Gold in Au-rich ores from the Geodo Mine occurs as native gold, ranging from 5 to 400 m in diameter, and is closely related to the Bi- and Te-bearing minerals bismuthinite and tetradymite, which at Geodo tend to be strongly enriched in Bi and depleted in S compared to ideal compositions. This association of gold with bismuthinite and tetradymite suggests that gold was deposited at relatively low temperatures, consistent with fluid inclusion studies on calcite that indicate that the gold was deposited from fluids ranging from 181 to 281C and 8.0 to 10.9 wt % NaCl equiv, and with chlorite geothermometry indicating a range of 198 to 211C. The presence of significant amounts of Bi- and Te-bearing minerals associated with Au suggests that liquid bismuth may have acted as a collector, increasing the concentration of gold.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Precious (Noble) Metal Ore Exploration
Author:White, NC (Dr Noel White)
ID Code:85152
Year Published:2012
Web of Science® Times Cited:3
Deposited By:Research Division
Deposited On:2013-06-17
Last Modified:2013-08-07
Downloads:0

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