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While operating a Komatsu HD785 haul truck during loading operations, a large rock fell from the Komatsu PC3000 backhoe that was loading the truck. The rock struck the tail end of the truck bed causing the front of the truck to bounce on the ground. The miner jammed leg causing discomfort to back and leg.

Contractor employee stated he brought the John Deere backhoe to the bag hours and was waiting form co-worker to return. He noticed water droplets coming from the discharge end of the rotary air valve. He went to investigate. He reached up into the discharge opening of the rotary air lock valve that was running and injured two fingers on his right hand.