Mineral Technology and Output Per Man Studies, Issue 6Works Progress Administration, 1937 - Mineral industries |
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1940 SHORT TONS annual volumes AVERAGE YIELD bonanzas Bureau of Mines Coeur d'Alene Comstock lode CORRY AND KIESSLING CURRENT PRICES VALUE Data decline of grade declining grade deposits district DOLLARS IN MILLIONS downward early economic figure flotation froth flotation geologic gold and silver improvement increased Joplin KIESSLING U.S. BUREAU Lake Superior lead and zinc Leadville low-grade lower-grade metal content milling Mineral Resources Minerals Yearbook MINES MINERAL TECHNOLOGY Missouri National Research Project Nevada OUNCES percent period porphyry porphyry coppers POUNDS OF COPPER Progress Administration recovery reserves Resources and Minerals selective mining small tonnages smelting STUDIES WPA-NATIONAL RESEARCH Survey Professional Paper TECHNOLOGY AND OUTPUT TELLER COUNTY tenor TONNAGE AND VALUE TONS IN MILLIONS TONS IN THOUSANDS TOTAL PRODUCTION trend of grade trend of yield U. S. Bureau U. S. Dept Utah VALUE AT CONSTANT VALUE AT CURRENT volumes of Mineral western WPA-NATIONAL RESEARCH PROJECT YIELD OF METALS YIELD PER TON