The magnificent copper mine at Dolcoath in Cornwall, employs underground 750 persons, consumes monthly 3000 pounds of gunpowder, and 5000 lbs of candles. It is 1400 feet deep, and contains in it 7,000,000 of cubic feet of excavated space. The pumps bring up daily from this mine 120,000 cubic feet of water.
(The Saturday Magazine vol. 1 July-December 1821, Philadelphia)
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