The miner was adjusting a conveyor belt. Miner was injured when the pipe wrench miner was using slipped & mashed finger. Miner was wearing ppe. Miner was taken for a medical exam & diagnosed w/ a contusion but only received 1st aid treatment. Miner was restricted from lifting weight with hand. On follow-up appt. miner was told to only work in a splint & would be reevaluated.