Features of the Formation of Gold Manifestations in the Black Shale Deposits of the Kumakskoye Ore Field

Abstract

In this paper the perspective gold ore district of the Southern Urals is considered—Kumakskoe ore field. In structural terms, it represents the articulation of the East Ural uplift and Tobolsk anticlinorium. Within the Kumakskoe ore field, a number of gold deposits and occurrences are extended (Kumak, Kommercheskoye, Vasin, Caesar, Baikal, Lun, Amur). The main structure elements of the field are two large tectonic faults, limiting it from the East and West—Аnikhovsky and Staro-Karabutak grabens, which are confined to one large tectonic seam, having commonality in the mechanism and time of formation. The paper shows their geological structure. Both grabens, which are made of Lower and Middle Paleozoic volcanogenic-sedimentary formations, which are represented by three structural floors separated by regional stratigraphic disagreements. A feature of the internal structure of grabens is noted—presence of faults in several directions and of different nature. Gold-bearing black slate deposits are studied. They show the presence of packs of contrasting interlayering of clay and terrigenous rocks with significant development carbonaceous mica-carbonate-quartz shales, the presence of sulfides and native gold in them, the wide development of crush zones, the proximity of Upper Paleozoic granitoid massifs.