TYPOMORPHIC FEATURES OF NATIVE GOLD FROM GOLD-ARSENIC-SULFIDE OCCURRENCES OF THE MANITANYRD REGION (POLAR URALS): COMPARISON WITH SIMILAR TYPES OF GOLD MINERALIZATION IN THE NORTH-EAST OF RUSSIA

In the ore occurrences of the Manitanyrd region, gold is associated with sulfides and is present in the ores in two forms - finely dispersed, submicroscopic in arsenopyrite and pyrite and native gold in the chalcopyrite-galena-sphalerite association. A comparative analysis of the composition of gold shows that the composition of gold (fineness, impurity elements) of a small deposit differs from the gold of ore occurrences in its lower fineness, its large dispersion, the presence, in addition to Ag, of Hg impurities, and the difference in the composition of fine and native gold. The identified typomorphic features of gold and their comparison with known gold ore objects in the North-East of Russia indicate some features of the genesis of ore occurrences in the region. Gold mineralization combines the features of orogenic deposits and gold-arsenic-sulfide deposits in black shale strata, differing from the latter by localization in Precambrian volcanic rocks.