THE INJURED WAS LOCATED AN OIL LEAK ON THE ROOF BOLTER. HE PLACED HIS LEFT HAND ON THE HOSE HE SUSPECTED AND INSTRUCTED THE OPERATOR TO PRESSURE IT. UNKNOWINGLY HE HAD HIS LEFT INDEX FINGER DI RECTLY OVER THE HOLE IN THE HOSE. WHEN IT WAS PRESSURIZED IT PIECED THE SKIN AND INFECTED HIS FINGER WITH HYDRAULIC OIL.