At the Premier mill, British Columbia, the minerun ore is dumped on a grizzly of 80lb. rails, spaced at 12 in. A StephensAdamson apron feeder delivers the grizzly oversize to an 18 by 30in. jaw crusher set at 3 in. At the Ross shaft of the Homestake mine, the primary crushing is done by two AllisChalmers size 8 gyratories.