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Ch. 10: The Essential Combination

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SYSTEMATIC MINING
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The method of laying out the workings is also here shown. Main tunnels are driven across the crater upon its longer axis,
and, at right angles from these, small tunnels are driven out every 30 feet until they reach the hard rock on the south side of the mine. These tunnels are widened, first along the rock until they connect one with another, and, at the same time, the roofs, or " backs," are stoped up until they are within a few feet of the
SKETCH SHOWING METHOD OF STOP1NG
Ch. 10: The Essential Combination Page of 449 Ch. 10: The Essential Combination
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