Engineering and Mining Journal, Volume 114McGraw-Hill, 1922 - Engineering |
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Alaska American amount andesite Arizona asbestos assay average Boston Curb British Columbia Bureau of Mines calcined cars cent copper chalcopyrite coal Coeur d'Alene Colorado concentrate Consol Consolidated cost Creek deposits district drill electric electrolytic engineer equipment flotation furnace Geological Gold Mining grade increase industry iron Journal-Press July 22 June June 22 labor leaching lead letter long ton machine magnesite manganese manufacture material ment metal metallurgical Mexico mill mineral months N. Y. Curb oil shale operations orebody output oxide patent petroleum pipe Pittman Act plant production profit prospector pump pyrite quotations railroad recently rock Salt Lake sample Sept shaft shale shipments shipped shovel silver smelter Smelting South steel strike sulphur tion tonnage Tonopah tons Toronto tunnel United Utah vanadium vein week York zinc