Mining and Engineering World, Volume 24Mining and Engineering World, 1906 - Mineral industries |
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Alaska amount Arizona assays average body borax Bullfrog Butte Calumet camp capital cent Chicago Chromite City claims coal Colo Colorado copper Copper company corundum creek Cripple Creek crosscut cyanide deposits depth district dividends drift drill east electric engine feet furnaces Gold Mining gulch high grade Hill Idaho Springs important increase installed iron Lake Superior lead lease ledge located lode long ton Magnetite manager manganese ment metal Mexico miles mill mineral Mining company Mont Montana months mountain opened operations ounces output pany past Pittsburg plant pounds production profit prospecting pyrite quartz railroad rich river rock shaft shipments shipped short tons showing silver smelter smelting stamp stamp mill steel tion Tonopah tons tunnel United Utah Valley vein Webb City week York zinc Zircon