Mining American, Volume 501904 |
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acid amount Arizona assay average boiler British Columbia California camp cents City claims Clear Creek County coal Colorado company's concentrates copper cost country rock County Cripple Creek crosscut cyanide Denver deposits depth district dividend drill dump electric engine equipped erected erty feet in width furnace Gilpin County Gold Mining Company grade gulch Hill hoisting Idaho Idaho Springs inches increase interested iron last week lead Leadville lease ledge located machine machinery manager ment metal method Mexico miles mill mineral Mining Reporter molybdenite Montana month Mountain Nevada opened operating ounces output oxide pany plant pounds president production pump pyrites pyrrhotite quartz railroad recently rock rope Rossland Salt Lake sample screen shaft shipment shipped short tons silver slimes smelter smelting solution South stamp mill stamps steam steel sulphide surface tion Tonopah tons tunnel Utah vein York zinc