Related Clues:

• Tram car fillers
• Tennis match parts
• Graded materials
• Rich rocks
• Refinery needs
• Mined rocks
• Fixes the time on, as a clock
• Soundstages
• Metal containers?
• Detonates, with ''off''
• Gold and silver, e.g.
• Gold or silver sources
• Bauxite et al.
• Miner's discoveries
• Metal-in-the-rough