Related Clues:

• It may be found in a pocket
• Smelter fodder
• Smelting material
• Seamy matter?
• Tramcar fill
• Cuprite, e.g.
• Smithsonite, e.g.
• '–ite' compound, often
• It's of miner concern?
• Comstock load
• Load from a lode
• Matter you mine
• Mine matter
• It may have a silver lining?
• Pyromorphite, e.g.