THE MINER WAS TAKING AN OXYGEN/ACETYKENE CUTTI NG TORCH CART OFF THE MAN CAGE AT 2380 LEVEL OF THE MINE. AS HE PULLED BACKWARDS ON THE CART HIS FEET SLIPPED CAUSING HIM TO FALL BACKWARDS BUMP ING THE CENTER OF HIS BACK INTO THE LATCH ON THEGATE. FOUR DAYS LATER HE WENT TO THE DR. FOR EXAM.