Russia, Irkutsk region, watershed of the rivers Homolkho and Imnyakh, gold deposit "Golets Vysochayshy", north wall of the pit. Carbon quartz-mica schists. The first photo shows quartz veins in the pit wall. Schists contain veins, lenses, and impregnations of pyrite and pyrrhotite.Khomolkhinskaya series. Thickness 650 meters. Paleoproterozoic.
Russia, Irkutsk region, the upper reaches of the creek of Alexander Nevsky, gold deposit - "Nevskoe". Gold ore.Quartz sulfide mineralization in paleoproterozoic quartz sandstones.Mineralization includes: pyrite, arsenopyrite, pyrrhotite, their oxides, gold, quartz and carbonate-quartz veins.
Russia, Irkutsk region, the upper reaches of the creek of Alexander Nevsky, gold deposit - "Nevskoe". Quartz sandstones with quartz and quartz-arbonatic veins. Fine grained. Cement - quartz-sericite, with carbonaceous matter. Aunakitskaya series. Host rocks for gold ore mineralization of the Nevskoye deposit. Paleoproterozoic.
Russia, Republic of Buryatia, Taksimo. Brownish-lilac and greenish large-pebble conglomerates with interbeds of sandstones. Pebbles and boulders in conglomerates up to 80 centimeters in size. Formed by sandstones, shales, granites and various effusive rocks. Sandy cement is metamorphosed to a saussurite-sericite aggregate, with feldspars, quartz, epidote and iron hydroxides. The interlayers of sandstones are green, greenish-gray, polymictic and quartz. Polymictic sandstones are formed by quartz, plagioclase and potassium feldspar. Mukhtunnaya series. Thickness 1300 meters.