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Vol. 12 (2009 year), No. 4
Kozyrev А.А., Rybin V.V., Zhirov D.V., Bilin А.L., Vinogradov А.N., Kasparian E.V., Vinogradov Yu.A., Semyonova I.E., Zhirova A.M.
Methodological principles of effective and safe open-pit mining at deep horizons of mineral deposits
The paper presents the investigation results of grindibility of copper-nickel ore sample, differences in the behavior of narrow grain size categories using rod and ball mill grinding. The characteristic mechanisms of destruction of the categories have been identified; the energy input on grinding has been estimated. Basing on the obtained data the choice of a two-stage scheme of grinding with rod mill at the first stage, and the ball mill at the second one for efficient ore preparation for flotation has been substantiated.
(in Russian, стр.10, fig. 8, tables. 0, ref 13, Adobe PDF, Adobe PDF 0 Kb)
Vol. 12 (2009 year), No. 4
Kozyrev A.А., Kasparian E.V., Zhirov D.V., Smagina Yu.G.
The Saamsky fault (the Khibiny massif) – an abnormal nature of the recent deformations
The Laubscher’s MRMR rock mass classification system has been described in this paper. The ratings definition of ores and host rocks of diamond deposit located in the Russian Federation has been carried out. It has been shown that ores and host rocks, according to MRMR classification, belong to the 4th class and have poor stability (good cavability), except for the rocks of the Upper assise. The mining method selection and underground openings support recommendations have been given.
(in Russian, стр.6, fig. 8, tables. 0, ref 4, Adobe PDF, Adobe PDF 0 Kb)
Vol. 15 (2012 year), No. 2
Mitrofanov F.P., Malitch K.N., Bayanova T.B., Korchagin A.U., Zhirov D.V.
Comparison of East-Scandinavian and Norilsk large plume mafic igneous provinces of PGE ores
The paper is devoted to issues related to the formation of large low-sulfide PGE ore provinces – East-Scandinavian and Norilsk. Basing multidisciplinary data it has been inferred that East-Scandinavian province is being attributed to an intracratonic type without subduction and crust contamination (with Pt-Pd low-sulfide mineralization to predominate). Norilsk province belongs to pericratonic one with PGE – Ci-Ni rich sulfide mineralization to prevail. It has been shown that the main ore provinces PGE metals essentially formed at later stage of existence and initial break-up of supercontinents – predominantly 2.7-2.5 Ga and 1.8-1.7 Ga as a unique case in the Late Paleozoic (Norilsk). For the first time long duration (dozens of Ma) and multistage nature of ore-magmatic system evolution for the East-Scandinavian mafic Large Igneous Province have been demonstrated and this has made it possible to propose it for Norilsk. Comparison of low-sulfide PGE and sulfide Cu-Ni (with PGE) potential of the mafic intrusions is possible using a series of geological, geophysical and geochronological (U-Pb on zircon and baddeleyite, Sm-Nd on rock-forming and sulfides minerals) and isotope geochemical (?Nd(T), TDm, ISr, 3He/4He) indicators.
(in English, стр.15, fig. 8, tables. 1, ref 41, Adobe PDF, Adobe PDF 0 Kb)