Related Clues:

• Rich rock
• Metal in rocks
• Source of iron or lead
• Refinable rock
• Graphite, e.g.
• It may be picked out
• Galena or hematite
• Refinery input
• Bonanza stuff
• King Solomon had one
• Heavy metal band?
• Miner matter
• Piece of mine?
• It may get panned
• Prospector's interest