GOLD FROM ORE-BEARING ROCKS OF THE HAICHURSKA AREA (WESTERN PRE-AZOV REGION)

Abstract

Data on the gold content of the Haichurska area in the Western Pre-Azov region are given. Haichurskyi ore occurrence is located in the near-fault monocline, which is composed of actino-litites, amphibolites, biotite and garnet-biotite gneisses, and high-aluminous schists of the Ternu-vatska series, which are rhythmically alternate. Significant content of gold has been determined in gneisses at intervals where they are bordered with gneiss-like melanocratic biotite granites. The ore body is composed of quartz-biotite-garnet gneiss with sulphides content up to 15–20 % (pyrite, marcasite, pyrrhotite, chalcopyrite, less often molybdenite, arsenopyrite, chalcocite). Gold is a later mineral; its content is 0.3–10.3 g/t. Gold associates with silver, the content of which reaches 30.0 g/t, and molybdenum. We investigated the typomorphic features of native gold using electron microscopic and mi-croprobe analysis. Gold is of medium- and high grade and is represented mainly by xenomorphic and hemiidiomorphic grains with the size of 0.01–0.20 mm.