Dzheltulak system of the Oktyabrsky ore-placer node of the Amur gold-bearing province

Abstract

Background. Information on the Dzheltulak large placer system of the Amur gold-bearing province, which has produced 80 tons of gold, is presented. Aim. To determine the geological and structural position of the Dzheltulak placer system, one of the most productive in the Amur province. To characterize placers and sources of their formation. Materials and methods. Published data and stock materials on the geological structure, gold potential, and gold production of the Oktyabrsky ore-placer node were used. Results. The Dzheltulak placer system developed from to an intrusive dome uplift and the gold mineralization of the Oktyabrsky ore placer node. The largest placers are concentrated near the top of the uplift, becoming poorer when moving away from the top. This indicates the centrifugal development of the placer system. The main source of placers is gold mineralization concentrated near the top of the uplift, being represented by gold-bearing areas of skarns and sulfidized limestones (Karlin type of gold mineralization). Conclusion. In order to maintain the level of gold extraction in the Oktyabrsky ore-placer node, identification and exploitation of new gold deposits are required. Among the latter, the most promising area, represented by gold-bearing skarns and deposits of the Karlinsky type, are predicted in the area of Mayachnaya Hill.