EE was unplugging transfer hopper when rocks broke free hitting the bar that EE was using to free up material. The bar pushed back and caused EE's left hand to impact the conveyer frame still holding the bar. EE had MRC predator Safety gloves ANSI IMPACT 1, PUN 2, ABR 3. EE was sent to ER for X-ray. EE got 8 stiches w/ antibiotics. No ligament or bone damage.