6 ft. by 16 in. ball mill. Capacity, 150 tons per 24 hr., average of nine months. Charge, 4 tons of balls. Speed, 28 rev. per minute. Horsepower, 36. Water, 1.5 tons KCN solution to 1 ton of dry ore. Elevation of feed end, 1.25 in. Consumption of balls, 0.5 lb. per ton of ore. Feed to mill through 2-in. mesh.