EE WAS ATTEMPTING TO LOAD A BRIDGE PLANK ONTO THE SCOOP. THE PLANK SLIPPED FROM HIS GRIP. HE STRAINED HIS LEFT SHOULDER. CAUSE OF THE INJURY WAS OVEREXERTION WHILE HANDLING MATERIAL. RULES/REG S NOT A FACTOR, MINER PROFICIENCY A FACTOR, EQUIPMENT NO INVOLVED, SAFETY EQUIPMENT OK.