Mineralogical and Geochemical Features of Native Gold in Combustion Products of Coal from the Erkovetsky Deposit (Upper Amur Region)

Resumo

A bulk coal sample from the Erkovetsky deposit is studied at Amur experimental and engineering facility. Separate fractions of coal combustion products (slag, fly ash, and sludge) are obtained for the first time, in which the morphology, fineness of gold and composition of inclusions have been studied. A consistent decrease in gold size and content is determined after coal combustion, transportation in a gas-smoke stream, and subsequent condensation. A comparative analysis of gold in the combustion products of coal and in ore bodies of the mountain-folded framing of the Zeya-Bureya basin is carried out, the ways of gold migration to peat bogs are considered.