ИСТИНА

Influence of micromorphological features of gold on the technological processes was studied using SEM and MRS analyses on the example of the epithermal Marzhanbulak and Zarmitan deposits. The dependence between micromorphology, mineral associations of native gold and its behaviour during enrichment was revealed as a result of conducted researches and technological tests: - Au-quartz association, advanced on the bottom horizons of Marzhanbulak deposits and in ores' bodies of Zarmitan deposit are characterized by the high fineness gold (840-860). It has round form and smooth surface, sculptures of layered growth and steps of joint growth with quartz crystals are seen on it. Such gold is better extracted by gravitation (64,6-70,6 %); - Au-guartz-sulfide associations of the Zarmitan deposit are characterized by the existence of early gold with low fineness (580), which forms isometric inclusions and later cement gold (690) with interstitial form. It has porous surface with traces of leaching and cube-octahedral embryos on its surface. Gold has zonation with a monolithic central part and complex multi-grain rims with clear corrosion relief of oxidation. Such kind of gold is better extracted by cyanizing after flotation (89,8 %); - Au-sulphosalt-polysulfide association from ore bodies of the Zarmitan deposit is characterized by high fineness gold (800). It has the complicated form with a cellular sculpture of surface, microblock structure and inclusions of other mineral phases. Plates and scales of gold prevail in association with sulphosalts. They are better extracted by flotation (63,4 %). - Gold from the zones of oxidation of the Marzhanbulak deposit is characterized by interstitial form. It has friable cellular structure and cavities on the external zone. It is better extracted by cyanizing after gravitation (95,9%).