### Montana Department of Environmental Quality (DEQ) - 125tech

The mill contained three stamps weighing around 600 or 700 pounds that dropped ... The mill had 12-stamps of 500 pounds each and could work 12 tons per day. ... loaded into trucks, crushed with a ball mill and concentrate shipped to East .... The mill could work 12 to 15 tons of oxidized ore per hour with a return of 83%.