Mining and Engineering World, Volume 42

Alaska Anaconda Ariz assay average Bureau of Mines Butte capacity cars coal Cobalt Coeur d'Alene Colo concentrates copper cost Creek crosscut cyanide deposits depth district dividends Dredging drift drill electric engine equipment flotation furnace geology Gold Mining grade ground high-grade Hill hoist Idaho increase industry installed Iron July June Kerr Lake Lake leaching lead lease locomotives lode M. J. Jan ment metal metallurgical miles mill mineral Mineral Point MINING WORLD Mont months Nevada North operations output Pinos Altos placer mining plant Press Jan production pump rock Sept shaft shipments shipped short tons showing silver Silver King smelter Smelting steam steel stope tion tonnage Tonopah tons tunnel United Utah vein Webb City week World Jan York zinc