Baley deposit of gold

The scheme of the part of the Baley ore field

BALEY DEPOSIT OF GOLD (RU: Балейское месторождение) is situated within the Eastern Transbaikalia. It has been discovered during the 1927, and is being developed since the 1929.

The mineralization is confined to the intersection of the north-eastern and north-western faults: it is localized within the graben, which is formed by the slightly-dislocated stratum of conglomerates and sandstones of the Cretaceous age, and its lesser part is localized within the Paleozoic granitoids, which are forming the sides and foundation of the graben (Figure). The deposit consists of the two parts: the stockwork of the short steeply dipping veins and venules (with the thickness of 1-20 centimetres) within granitoids (the northern part); the individual veins and veinous zones (the thickness is up to 4 metres) within the sedimentary rocks along the dip-slip faults with the halos of the venulous mineralization, which are having the industrial significance (the southern part).

The ore veins are formed by the fine-grained and crest quartz with the impurity of the phyllosilicates, adularia, carbonates. The textures of the ores are finely-striped, crusted, tabular, and brecciated within the certain places. The quantity of the ore minerals within the veins is 0.5-1.0%; there prevail the pyrite, marcasite, sulfosalts of antimony and silver. There are developed the late isolates of the stibnite, and arsenopyrite within the certain places. The gold is native (the millesimal fineness is 650-750), prevalently finely dispersed, less often in the form of the spongy clusters and dendrites with the length of up to 10 millimetres. The deposit is being developed by the open pit and underground methods (the chamber system of development with the stowing of the goaf space). The mine workings are heavily watered (more than 5000 cubic metres per hour) within the certain places. The ore is beneficiated by the method of flotation, with subsequent cyanidation of concentrates.