Show they mine the hagh grade and low grade ores os 2 aa all N S i 7 0 g T Y ax a D 1 1 jj IN f ax wa 4 miners in one of mines where low grade ore is a problem all in mines I 1 a e s contain various amounts 0 of low grade ore a term given to the grade which Is too low grade to ship or mill the values are there but bat the operating cost la is too heavy to warrant mining the amount of ore in a mine is therefore largely determined by operating costs encountered in handling it labor costs supply costs sometimes pumping costs shipment costs treatment costs and taxes all are a determining factor la in the situation low grade ore is a problem in some instances it Is necessary to mine the product and store it on the dump but most often it Is loft left in the mine when it is piled on the dump it Is generally stored separate from the mine waste la in the hope tha it way may be of value at some future time therefore the higher the cost ot of operating pe rating a mine the smaller the fineable mine able ore body bec becomes onles and the smaller the ore reserves and the smaller the mining industry in utah mines have adopted a policy ot of mining as much low grade as possible with the view ot of lengthening the life of theetter the enterprise prise rather than gutting the high grade ore for or a temporary showing it becomes a tragedy when low grade ores are left in the ground because miners can seldom come back and take this ore out unless the low grade la is rained mined with the higher grade the great majority will remain underground forever thus much potential wealth is lost |