The foreman and crew were preparing to make a conveyor belt set up. The feeder would require crib blocks under it to elevate the dump end onto the conveyor belt tailpiece. The battery powered personnel carrier which had the crib blocks loaded on top of it became stuck while tramming in reverse. When the personnel carrier switch was turned to the forward position, it trammed forward out of control in high tram. Crib blocks had fallen onto the foot controller and blocked the brake from being depressed. The personnel carrier moved forward approximately 8 feet pinning the foreman against themine rib resulting in fatal injuries to the victim.