Contractor maintenance work (installing a sheet metal patch) was being performed on a bin under a vibrating screen at the facility wash plant. Welding slag blew through exterior wall of bin, igniting combustible rubber liners inside bin, causing a fire which impacted the bin, a vibrating screen, four conveyor belts, and adjacent infrastructure.
Employee was climbing stairs to the sand and gravel plant when his foot slipped. He was holding onto the railings, so he did not fall, but reported that he twisted his right knee.
Employee mechanic was at our mine site doing PM to our excavator #18. He was underneath the machine, on the ground in a squatting position, installing the belly pan twisting from side to side and in the process twisted his left knee.
Grates used for guarding were stacked against a wall. He was trying to lift one that fell on the ground. It was partially under the others. As he lifted, the other started to fall forward. He caught them with his hands and thigh. They came to rest on his thighs and knee cap. No cuts, there was bruising and soreness to knee.
HURT LOWER BACK STEPPING OFF MACHINE. TRACKS OF THE EXCAVATOR WERE WET AND MUDDY.