Employee was operating a D-9L Dozer at the raw coal pile when the dozer slid into the feeder causing the employee to strike head against the window of the dozer. EE suffered a laceration to the head that required 5 staples and to the ear that required 7 stitches. Compliance with rules/regs, PPE, mining equip/systems not a factor. Miner proficiency may be a factor.