Abstract
Selective mining of complex structured ore bodies will enable increased iron content in the mined ore mass in underground mining at Kryvyi Rih iron ore basin applying the existing mining systems. The article determines the way the grade changes in a mine block of a complex structured ore body when applying bulk and selective mining as well as factors influencing indices of extracting ore mass from the block. The investigation results prove that it is reasonable to mine complex structured ore deposits with barren inclusions applying selective mining if the iron content in the block varies from 64 to 67% and horizontal thickness of the barren inclusion makes 4 – 12 m. At that, the thickness ratio should not exceed 0.3. Stoping methods should be applied to receive high indices of ore mass extraction. There is determined an ore/barren inclusion-to-ore body thickness ratio considering the dilution factor that confirms practicability of selective mining of complex structured ore bodies. Selective mining of complex structured ore deposits of Kryvyi Rih iron ore basin applying open stoping enables increasing the mined ore mass quality without considerable capital and operating costs and, consequently, staying on the market and enhancing the environmental situation in the region.
Highlights
Ore deposits of Kryvyi Rih iron ore basin are represented by single and parallel-contiguous bodies consisted of complex structured ore bodies
When mining deposits represented by complex structured ore bodies (CSOB) by traditional underground methods, the iron content in the mined ore mass decreases by 3 – 6% in relation to the main grade with ore losses being 1.5 – 2.0 times larger as compared with the standard
Selective mining of the mineral from blocks enables mining it with the iron content in the ore mass of over 62% and holding market positions
Summary
Ore deposits of Kryvyi Rih iron ore basin are represented by single and parallel-contiguous bodies consisted of complex structured ore bodies. The number of the areas within the deposits makes about 8% on average, i.e. over 100 mln t of the balance rich iron ore reserves of Kryvyi Rih iron ore basin. When mining deposits represented by complex structured ore bodies (CSOB) by traditional underground methods, the iron content in the mined ore mass decreases by 3 – 6% in relation to the main grade with ore losses being 1.5 – 2.0 times larger as compared with the standard. Selective mining of the mineral from blocks enables mining it with the iron content in the ore mass of over 62% and holding market positions
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