EE WAS CARRYING A CRIB BLOCK AND TRIPPED OVER ANOTHER CRIB BLOCK LAYING ON THE MINE FLOOR. CAUSE OF INJURY WAS AWARENESS AND KEEPING WALKWAYS CLEAR. COMPLIANCE WITH RULES/REGS WAS NOT A FACTOR . PERSONNAL EQUIP/ITEMS NOT A FACTOR, MINER PROFICIENCY A FACTOR, MINING EQUP/SYSTEMS NOT A FACTOR.