Kennecott Ridgeway Mining Company (KRMC) operated a 15,000 tons-per-day (TPD) open-pit gold / silver mine. The mine and mill complex operated 24 hours a day, 7 days a week, and employed over 100 people. The mine utilized an assortment of mining equipment, ranging from blasthole drills, 85 & 100 Ton Haul Trucks, Front End Loaders, and ancillary support equipment. Blasting was performed by a contractor. On-site assaying of drill cuttings allowed engineering control (ore control) to be done on a timely basis, keeping the mine running, which in turn, allowed the mill to keep on producing. The mill, ground the ore to minus 200 mesh, then utilized a modified Carbon-In-Leach (CIL) circuit, followed by an electrowinning process, to extract and recover the precious metals. On average, 33 tons of ore were processed to recover 1 ounce of gold. Processed materials from the mill, were piped to the tailings facility for dewatering and internment.