TWO EMPLOYEES WERE PUTTING AWAY AN OXYGEN CYLINDER, TRANSPORTING THE BOTTLE TO THE STARAGE AREA. AS ONE EMPLOYEE PICKED UP THE CYLINDER IT SLIPPED OUT OF HIS HAND & STRUCK THE TRAM PEDAL. THE VEHICLE MOVED & STRUCK THE OTHER'S LEG. CAUSE OFINJURY WAS NOT SHUTTING OVER POWER TO EQUIPMENT & SETTING BRAKE. COMPLIANCE WITH RULES/REGS WAS A FACTOR. MINER PROFICIENCY A FACTOR.