Proven efficiency with HRC™ Promising results Gyratory crusher Cone Crusher Energy Efficient Mill Circuit provides an innovative energy efficient solution with the world's largest HPGRHRC™ 3000 at FreeportMcMoRan's copper mine in Morenci HRC™ 3000 has been fully operational since May 2014 at FreeportMcMoRan's Morenci copper mine in Arizona.