Gypsum Mining Method & Cost
Compressed air for all quarry operations is supplied by a Chicago Pneumatic, 1,000-c.f.m. air compressor, driven by a 175-hp., 440-volt, synchronous motor. National Gypsum Co. General. The National Gypsum Co. plant and quarry are about 3 miles south of Fort Dodge, Iowa, and embrace about 650 acres.Web
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