Abstract
Brief information about the history of the discovery of the large Pioner gold deposit in the Amur province is given. The main features of the geological structure of the deposit, located at the contact of the multiphase granitoid intrusion of the Early Cretaceous age and terrigenous rocks of the Middle-Late Jurassic, are shown. Ore bodies are linear stockworks of silicified and carbonated rocks with gold sulfide mineralization. Gold is both free in the form of large, small and micron-sized particles, and in bound form in pyrite. In common ores, its fineness ranges from 650 to 880 units, in rich ores it rises to 870 - 915‰.
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