Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . FiG. 21. hand holes in overhand stopes, — as in rill-stoping, — are usedentirely in some
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Principles of mining : valuation, organization and administration; copper, gold, lead, silver, tin and zinc . other easy supply, materials from crosscuts driven into thestope-walls are sometimes resorted to. In working the
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