Abstract
The research for examination of elemental composition of typical metasomatic rocks and ores have been carried out According to the data of mineral and petrographic analysis of twenty transparent sections in parallel and crossed Nicols, specific associations of minerals in ore of current production at “Vostochnyi” mine have been determined. Flotation testing on beneficiation of tailings of core geological samples has been conducted. Substantial redistribution of valuable mineral from easy ores to diluting rocks has been noted. The percent of greisen ore, with coarse scheelite grains, has become extremely rare and on the average is 2 - 2.5% of gross mass of scheelite-quartz ore. The appearance of skarn minerals relicts and, at times, areas of skarn minerals in scheelite-sulphide ores leads to formation, in the near-vein spaces, of scheelite-biotite, scheeliteamphibole, scheelite-piroxene, scheelite-chlorite and scheelite-mica complex associations. Impregnations of scheelite have been found in quartzous rocks, the composition of mother rocks may be diverse (skarn, skarnified or biotite hornfels, quartzites). The number of dispersed single scheelite grains in rock and anhedral grains in near-vein spaces adjacent to veins with high scheelite concentration has grown. The content of СаСО3 which is conditioned by the presence of Ca-containing minerals in the composition of skarn in the shape of thin (fine) grain crystalline impregnation along the crevices and cleavage faces with formation of thin microveinlets, often together with quartz has increased. The calculation of expected extraction has evaluated the drop of scheelite extraction from feed of Primorskaia ore-processing plant in saleable concentrate of down to 3 %.
Highlights
Scheelite skarn deposit — “Vostok-2” — refers to the main genetic type of tungsten deposits widely mined in Russia
In the global preparation practice, the expansion of resource base of tungsten takes place towards the searches and mining of deposits which are large by reserves, but with low content of WO3 0.15 - 0.20% [King Island (Australia), Ferbertal (Austria), Salo (France), Kti-Teberd (North Caucasus), Kayrakty, Koktenkol (Central Kazakhstan), Skrytoe (Russia, Primorskii krai)], the involvement of dradge rock dumps and residue formations [3-9]
Ore feed supplied to Primorskaia ore-processing plant for preparation has its valuable mineral percent redistributed by types as follows: from rich easy scheelite-quartz-sulphide ore with 80% to 60 %, into rocks from 1% to 25%
Summary
Scheelite skarn deposit — “Vostok-2” — refers to the main genetic type of tungsten deposits widely mined in Russia. In global balance, these deposits account for about 65% of ore production, whilst reserves amount to not more than 30% (S.G. Solovev, 1997) [1]. In the global preparation practice, the expansion of resource base of tungsten takes place towards the searches and mining of deposits which are large by reserves, but with low content of WO3 0.15 - 0.20% [King Island (Australia), Ferbertal (Austria), Salo (France), Kti-Teberd (North Caucasus), Kayrakty, Koktenkol (Central Kazakhstan), Skrytoe (Russia, Primorskii krai)], the involvement of dradge rock dumps and residue formations [3-9]. Feasible mining of new low-grade deposits and residue formations may be reached by way of combined processing flow sheets with preliminary concentration of valuable components in the head ore with the use of radiometric methods of separation [1013]. In order to define perspective directions with the increase in efficiency of main processes of flotation flow sheet for preparation, detailed study of elemental composition of ores, rocks and preparability evaluation are required
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