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This paper compares the methods of mechanical mining of rock in terms of their efficiency, energy consumption, and the durability of the tools they involve. It presents the advantages of mechanical headingdriving methods. In the first part, we described the methods used to assess rock workability, and the influence of rock types and parameters on mining efficiency.
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CRITERIA OF DESIGNING OF CUTTING HEADS FOR ROADHEADERS ... The performance of mining effected by me ans of a roadheader i ... The benefit of having an ore pass with a big storage capacity .
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CRITERIA OF DESIGNING OF CUTTING HEADS FOR ROADHEADERS ... The performance of mining effected by me ans of a roadheader i ... The benefit of having an ore pass with a big storage capacity .
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That is not to infer, of course, that no shafts have been sunk in the past 50 or 60 years—far from it—but the dominance of the big open pit in supplying major proportions of the world''s iron ore, copper, gold, coal and bauxite has pushed underground mining aside in many situations.
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