Dr. Elara Vance stared at the raw tonnage report from the new crushing circuit. The number was good—really good. Throughput was up 12% from last quarter. Her phone buzzed with a congratulatory text from the mine manager.
Her first stop was the primary crusher. The operator, a veteran named Gus who chewed tobacco and hated change, saw her coming. Statistical Methods For Mineral Engineers
There, the problem was different. The mill power wasn't erratic—it was stubbornly stable. And that was worse. Because the cyclone overflow particle size (the % passing 75 microns) was drifting downward, slowly but surely. The shift supervisor kept increasing the mill feed rate to compensate, chasing the tonnage target. saw her coming. There