Annual report of the State Mineralogist for the year ending ... . ty-two thousand gal-lons of water are handled everytwenty-four hours by three pumps—one six-inch Cornish plunger andtwo jackhead pumps. The kind ofpowder used is Giant, and about onepound of it is used to the extraction of one ton of ore. The cost ofmining ore is $2 per ton. The character of ore is quartz, with pyritesof iron, and has averaged about $10 per ton in free gold. There is atwenty-stamp mill, of one thousand-pound stamps, on the mine, which,under a six-inch drop, are dropped eighty times per minute. The dis-charge is
Annual report of the State Mineralogist for the year ending ... . ty-two thousand gal-lons of water are handled everytwenty-four hours by three pumps—one six-inch Cornish plunger andtwo jackhead pumps. The kind ofpowder used is Giant, and about onepound of it is used to the extraction of one ton of ore. The cost ofmining ore is $2 per ton. The character of ore is quartz, with pyritesof iron, and has averaged about $10 per ton in free gold. There is atwenty-stamp mill, of one thousand-pound stamps, on the mine, which,under a six-inch drop, are dropped eighty times per minute. The dis-charge is six inches high, and two tons of ore are crushed per stampevery twenty-four hours. Chrome steel shoes and dies are used, andcost 8^ cents per pound. No. 9 slot-punched screens are the kindused, the screen frames being divided into three parts to each batteryof seven inches in width by seventeen inches in length. The apronsare four feet in width by four feet in length, and there are fourteenfeet of sluice to each battery, fourteen inches wide, all covered with. 204 REPORT OF THE STATE MINERALOGIST. silver-plated copper plate. They are given an inclination of one andthree quarters inches per foot. The mill is supplied with four Chal-lenge feeders. About 60 per cent of the gold recovered was saved inthe battery, and 40 per cent on the outside plates. Eight Frue concen-trators are in the mill. The sulphurets averaged $150 per ton in gold,and twenty ounces of silver per ton. The plant has a roasting furnace of three tons capacity. The minehas employed thirty-five men, and seven men in the mill, with two out-side. Wages averaged $3 per day in the mine, and $4 per day in themill; outside labor being paid $2 50 per day. A Hamilton Corlissengine, ten by thirty-inch cylinder, with a horizontal tubular boiler,fifty-two inches in diameter by sixteen feet in length, supplied the millwith power. Hoisting was done by means of a double vertical hoist,nine by ten-inch cylinder, steam supplied
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Keywords: ., bookcentury1800, booksubjectgeology, booksubjectminesandmineralr
