Angara-Katskaya group of the iron ore deposits

ANGARA-KATSKAYA GROUP OF THE IRON ORE DEPOSITS (RU: Ангаро-Катская группа железорудных месторождений) is situated within the Krasnoyarsk region of the RSFSR, at 100-150 kilometres from the Ust-Ilim hydroelectric power station. There are within the region 13 deposits and ore manifestations; the largest of them are the Neryundinskoe, Kapaevskoe, Atavinskoe, Polivskoe, Moldavanskoe, Ponomarevskoe, and Katskoe. All deposits are of the hydrothermal origin. The deposits have been discovered in 1960-65 during the aeromagnetic works. The Neryundinskoe deposit has been discovered in 1960 according to the claim of hunter F.M.Voloshin. The Angara-Katskaya group is geologically associated with the Angara-Vilyuy zone of the faults, which is formed of the weakly dislocated sedimentary rocks (argillites, aleurolites, sandstones, marls, limestones, tuffs) of the Tunguska series (from Upper Paleozoic to Lower Mesozoic).

The ore bodies are represented by the stocks, lenses, pillars, and veins of the massive ores, among which there are developed the brecciated ores and mineralized skarns. The ratio of the massive and brecciated ores is 1:3. The main ore mineral is magnetite, the ore minerals of the secondary significance are hematite, martite, limonite, muschketowite. The content of Fe within the ores is from 15% to 60% (33% on average). The reserves of the Angara-Katskaya group down to the depth of 1200 metres within the A+B+C1 categories are 546 million tonnes. There is necessary for the usage of the ores the magnetic scheme of the benefication.