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costs of mining methods

Mining Methods, by W. R. Crane, gives the cost of operating a 3in. drill in granite. At the North Star mines machine men cost 3 a shift or 43c. a ton machine power, 40c. a shift or 6c. a ton repairs and lubrication, 42c. a shift or 6c. a ton drill steel and sharpening, 75c. a shift or 10c. a ton total for drilling, 4.57 a shift or 65c. a

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