Title

V.A. STEPANOV (NIGTC FEB RAS), A.V. MELNIKOV (IGIP FEB RAS)

Deposits of gold­sulphide­quartz formation of the Amur province

The description of the deposits Pioneer, Bamskoe and Kirovskoe gold­-sulphide-­quartz formation in the Amur gold­bearing province. It is shown that the deposits tend to the granite massifs of the Mesozoic most of Early Cretaceous age, lying in their endo­ and exocontacts. The isotopic age of gold mineralization of the Early Cretaceous. Gold­-sulphide­-quartz deposits are characterized by powerful and extensive ore bodies are represented by zones of vein-vein and metasomatic quartz, less sulphide-­quartz veining with ordinary and poor content of gold. Ore bodies are accompanied by zones of beresitization, less of argillization. Ores contain moderate amounts of sulphides (5–20%) represented mainly by pyrite and arsenopyrite. Gold is found both in free form and bound in sulphides. The relationship between free and bound gold fluctuate in considerable limits, determining the technology of enrichment of ores. An important industrial significance of the oxidation zone with a predominantly free gold.
Keywords: gold­-sulphide­-quartz deposits, province, native gold, sulphides, beresitization, the oxidation zone.