The geochemical features of ores and technosoils of tailing gold-molybdenum mine Davenda in East Transbaikalia

• Published in: Litosfera (Ekaterinburg. Online) no. 2; pp. 91 - 106
• Main Authors: G. A. Yurgenson, O. K. Smirnova, M. A. Solodukhina, R. A. Filenko
• Format: Journal Article
• Language: English
• Published: A.N. Zavaritsky Institute of Geology and Geochemistry 01.04.2016
• Subjects: a chemical element; deposit davenda; eastern transbaikalia; factor of biological absorption; gold-molybdenum ore; tailing; technosoil; the mobile form; восточное забайкалье; давендинское месторождение; золото-молибденовая руда; коэффициент биологического поглощения; подвижная форма; технозем; хвостохранилище; химический элемент
• ISSN: 1681-9004; 2500-302X

New data on the mineral and chemical composition of the ore, host rocks and technosoils of tailings gold-molybdenum deposit Davenda are outlined. The mineral composition of the ore (%): quartz (96), molybdenite (1, but on average 0.26), pyrite (7), chalcopyrite (2), sphalerite (0.07), galena (to.1), sulphosalts (0.02), bismuthinite (0.2), scheelite (up to 0.02), tungsten (up to 0.01), bornite (0.03), tetradymite (to 0.001) emplektite (rare occurrences) and gold (up to1817g/t). In the oxidation zone developed various sulfates, including large (up to10 cm) gypsum crystals, chalkanthite, malachite, azurite, brochantite, molybdenite, ferrimolybdite. The contents of the main chemical elements, which compose technosoils of tailing, exeed their clarks. Exceptions are zinc, tin, and yttrium. Especially high concentration factors for arsenic, bismuth and molybdenum, which indicates the imperfection of applied technologies of the ores enrichment. The distribution of chemical elements in the geotechnogenic system: productive mineral complex (ore + host rock)→soil→technosoils →plants. Revealed the share of Mo, Zn, Cu, Pb mobile form, in technosoils. Identified acid-base characteristics of technosoils. It was found that the most important of the mobile forms is a water-acid-ion exchange, to a much lesser extent - organic elements.