Berezovskoe deposit

The scheme of the layout of the quartz-ore veins within the Berezovskoe deposit

BEREZOVSKOE DEPOSIT of gold (RU: Березовское месторождение) is situated at the Urals mountains, within the Sverdlovsk province of the Russian Federation. It has been discovered during the start of the 18th century, and is being developed since the 1745.

They associate with the start of the mastering of the Berezovskoe deposit the birth of the gold ore industry within Russia. The ore field is situated within the limits of the Ural-Tobolsk anticlinorium within the lowered block, which is bounded by the sub-meridional faults and large bodies of the ancient gabbro and hyperbasites (at the north and south), and by the the Hercynian granitoids (at the east and west). The block is formed by the Lower Paleozoic layered strata (the siliceous-carbonaceous schists, the phyllites with the interlayers of the tuffites, the metamorphosed diabases and porphyrites within the lower part of the cross section), which are enclosing the sills and the laccolite-like bodies of the serpentinized peridotites and pyroxenites. The rocks have been breached by the numerous dikes of the plagio-porphyries, granite-porphyries, lamprophyres of the varying age. The length of the dikes is up to 20 kilometres, the thickness is 2-40 metres, the strike is near-meridional, the dip is steep. There are confined to the transverse cracks of the rupture within the dikes the short steeply dipping quartzous ore "ladder" veins (Figure), there are less developed the slightly inclined latitudinal and diagonal ones.

There exist within the sedimentary-volcanogenic and intrusive rocks the "krasichnye" veins, which are of the same type according to their composition with the "ladder" ones, and which are their continuation at the certain places within the country rocks. The veins within the limits of the ore field are distributed unevenly. There are widely developed the near-veinous changes, namely, the listvenitization of the hyperbasites and sedimentary-volcanogenic rocks, the beresitization of the veinous granitoids. The ore veins are formed by the large-grained quartz, carbonate, sulfides. The major ore minerals are the pyrite, and, within the individual places, the galena, tetrahedrite, aikinite, chalcopyrite, native gold, and others. Gold (the millesimal fineness is 800-900) is distributed unevenly in the form of the fine dispersed interspersion (the gold-bearing property of the early isolations of sulfides), and in the form of the larger clusters (the late generations of sulfides), and, at the upper levels, sometimes in the form of the small nuggets. There are being worked the clusters of the veins within the dikes and within the country rocks. The deposit is being developed by the underground mining method, mainly with the shrinkage of the ore, less often with the sublevel breaking and excavation of the horizontal layers with the hydraulic filling of the excavated space (at the lower horizons). The inflows of water within the mine working are up to 1600 cubic metres per hour. The beneficiation is performed according to the flotation method. They use the tailings and waste rocks as the goaf filling and building material.