Stoping at Noranda

CIM Bulletin1939
This paper was presented simultaneously at a meeting of the Institution of Mining and Metallurgy, London, and at the 1939 Annual General Meeting of the Institute. Following is a summary of the discussion on the paper at the two meetings.
Keywords: Bits, Cost, Costs, Diamond, Diamond Drilling Practice, Mount Isa, rhyolite, rock, Diamonds, Drill, Drilling, Drills, Noranda, Rock drills
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