A CONTRACTOR PARKED HIS TRUCK IN A TURN AROUND AREA APPROX. 75 YARDS FROM STOCKPILE OF UNDERGROUND MINE. HE PLACED AN IMPROVISED STAND UNDERNEATH THE REAR OF THE TRUCK TO LEVER THE TRUCK OFF T HE GROUND AS BED RAISED. UNDERNEATH, HE BEGAN WORKING, ADJUSTING BRAKES. TRUCK EITHER ROLLED OR SLIPPED OF STAND PINCHING HIM BETWEEN THE REAR AXLE & STAND. FOUND SITTING ON GROUND UNDER TRUC