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Early Diamond Drill for Deep Holes
USES OF THE DIAMOND DRILL
Joy No 12 Core Drill with Gasoline Engine
195 other sections not shown
allow angle assay assembly average blast hole bortz bottom Canada Canadian carat carbon cause cement cent Chapter circulating Company core barrel Core Drill core recovery cost coupling depth diameter diamond drilling drill hole drill rods driving engineer equipment face feed feet field fittings foot formations give ground hard head heavy hole drilling important inch increase indicated industrial inner inside iron kerosene larger length less Limited lower machine material metal method mining necessary noted operation overburden pipe present pressure production pump reaming shell removed rock rotational sample shoe shown shows sizes sludge sometimes speed standard steel stones supply surface survey Table tests tool tube United usually various vein vertical volume wall wash wedge weight