Metso and Freeport-McMoRan celebrated an impressive milestone in Q2, 2017 as the new HRC3000, the world's largest operating high-pressure grinding roll, at the Metcalf Concentrator crushed its 100,000,000th short ton of ore. The HRC 3000 started operating in May 2014 at the Metcalf Concentrator at Freeport-McMoRan's copper mine in Morenci, Arizona, USA, an open-pit copper mining complex that has been in continuous operation since 1939.