THE WAS ASKED TO REMOVE SCREWS FROM A METAL ROOF DECK ON THE EAVE OF A ROOF. FOR REASONS UNKNOWN, THE MINER REMOVED HIMSELF FROM THE ELEVATED WORK PLATFORM (JLG AND GOT ON THE ROOF. HE ALSO VI OLATED COMPANYPOLICY IN PROCEEDING TO WORK IN AREAS OF THE ROOF WHILE NOT TIED-OFF. WHILE WORKING ON THE ROOF DECK, NOT IN FRONT OF THE JLG AND WHILE NOT TIED-OFF, HE FELL TO THE GROUND.