Related Clues:

• Heavy metal?
• Refined find
• It's north of Calif.
• Bonanza find, perhaps
• Seamy matter
• Smelter's need
• 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