MSs, CUs of miner preparing to blast, filling holes with powdered explosive. MLS, MS of single miner prying loose chunks of ore with steel rod. Various shots of miners examining tunnel wall, being joined by others, discussing same. Shots of miners' lamps shining out of darkness of tunnel as they come nearer. Shots of men talking. Short sequence on man operating powered blade used for bringing broken ore to hole. CU of "Danger" sign. Head on shot of group of miners walking toward the camera from interior of tunnel, head lamps flashing into the lens. Shots of men climbing a ladder.