IROCK RDS-20 primary crushing plant has a 5x16-foot, double-deck screen. It can crush, screen and separate up to three different sizes of materials, two sized and one crusher run, at a rate of up to 500 tons per hour. The initial vibrating feed opening is 52x17 feet, and the crusher feed opening is 56x32 inches. Closed-circuit design allows both decks of oversized material to return to the feeder for another pass through the crusher after the initial round of screening. The crusher is powered by a 440-horsepower Cat C-13 ACERT engine.