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Abstract The Shuangjianzishan Ag-Pb-Zn deposit with a reserve of 145 Mt @128.5 g/t Ag (c. = 18,600 t or 600 Moz Ag) and 2.2 wt% @ Pb + Zn (=3.2 Mt) in the Great Hinggan Range (GHR)… Click to show full abstract
Abstract The Shuangjianzishan Ag-Pb-Zn deposit with a reserve of 145 Mt @128.5 g/t Ag (c. = 18,600 t or 600 Moz Ag) and 2.2 wt% @ Pb + Zn (=3.2 Mt) in the Great Hinggan Range (GHR) ore district in NE China is the largest known silver deposit in Asia. The Ag-Pb-Zn mineralized veins are primarily hosted by a Permian slate unit. Three primary paragenetic stages of early pyrite + quartz ± K-feldspar (I), main ore sulfide + sulfosalt + quartz + calcite + sericite + chlorite ± epidote (II), and post-ore quartz (III) have been identified. The ore stage II was the dominant period for silver mineralization with canfieldite (Ag8SnS6), argentite (Ag2S) and freibergite [(Ag, Cu)12Sb4S13] the prevailing silver-bearing minerals. Fluid inclusion microthermometric studies revealed that the Ag-Pb-Zn vein formation occurred within a temperature range of 250° to 210 °C and at a salinity of
Journal Title: Ore Geology Reviews
Year Published: 2019
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