Abstract: At approximately 2:10 p.m. on August 22, 1990, Employee #1 was directed to move a mine drill vehicle that had a defective service brake system. Employee #1 had no training on this equipment and was unaware of the brake failure. As he first moved the equipment away from the edge of the ridge, he released the parking brake, and the unit moved forward up onto a rock outcrop. The machine began to roll, and Employee #1 attempted to reverse it, but could not because his foot was on the brake. The equipment rolled over the low rock outcrop and careened out of control down the 30 percent slope. After traveling approximately 192 ft, Employee #1 attempted to jump clear of the vehicle. He was run over by the left rear wheel of the vehicle and was killed.