EMPLOYEE WAS REMOVING OVERLY TIGHT LUG NUTS FROMA ROOF BOLTER TIRE USING A 3/4 RATCHET, A 4' CHEATER BAR & A 4' SLATE BAR. AFTER SEVERAL ATTEMPTTO LOOSEN THE BOLT, IT SLIPPED SUDDENLY AND MCNE ELY FELL TO THE MINE FLOOR LANDING ON HIS RIGHT WRIST & TAILBONE. MCNEELY WAS ATTENDED BY AN ORTHOPEDIC SURGEON AND ADVISED TO STAY OFF WORK.