Show 0 built on low grade ores V 0 R VA gm N T av 3 1 A 11 an 0 za NT 4 9 A U tay V Z I 1 WIN wa i looks look like country rocko rock but it Is less than I 1 percent copper ore going in into t 0 huge crusher crosher or coffee grinder at magna all mines contain a varying y amount ol of low grade ore a term i given to that grade erada which la Is too low in mineral values to sh phlp I 1 p small mineral valued ara are in the ore but the cost of brodu producing cing it 1 la too heavy to meet the mining milling and smelting smelling sm elting charges i the amount of ore in a mine la Is therefore largely determined by tha over operating allne costs encountered in handling it labor costs coal supply costs costa sometimes pumping costs coats shipment costs treatment costs and taxes all enter into the situation low grado grade ore Is a problem in sorria some In instances it Is necessary to mine the product and it on tho the lump dump but more often itts loft left in the mine when it la Is viled piled on the tha dump it Is generally general lr stored separate from the mine waste in tho the hope that lamay bo be ot value at soma some future time There toro othe the hig herthe cost 0 at operating a i mine the smaller sai aller the tha fineable mine able oro ore body becomes beco iusa and tho smaller the tha ore reserves and them the smaller the mining industry in utah mines have adopted a policy ot at raining as aa much low frade as aa possible thereby lengthening the ho life ot of tho the enterprise enter prIm rather than buiting guiting gui ting the high grade ore tor for a temporary showing it becomes a tragedy whon when low grada ores oreb ire re left in the ground because miners can ami seldom faino came back and take this ore out unless the law grade la Is mined with the high arade tho the great majority will underground forever r thus much potential wealth la lost to humanity hum human arity aly forever |