Office of Wastewater Management Hardrock Mining Wastes
Spent Ore ; Mill Tailings Total waste (rock waste and mill tailings) produced during extraction and beneficiation of minerals can range from 10% of the total raw material removed from the earth for potash to more than 99.9% for gold. Table 1 illustrates the amount of amount of waste various mining industries produced in 1992 (Bureau of Mines 1992)..Fote Mining Machinery Co