EE WAS PUTTING A B.O. JACKLEG DRILL INTO A MINE TENDER & STRAINED HIS BACK AS HE LIFTED/TWISTED.HE THOUGHT IT WAS REALLY NOTHING AT THE TIME. NO MEDICAL TREATMENT WAS GIVEN UNTIL 03/07/02 WHEN HE COMPLAINED THAT HIS BACK WAS BOTHERING HIM FROM THE INCIDENT ON 10/09/01. HE WAS TAKEN TO THE DOCTOR & RECEIVED RESTRICTED DUTY.