Related Clues:

• They're not refined
• Nev. neighbor
• See 9-Down
• It's pursued in vein
• See 63-Across
• It may be picked
• Metal containers
• They may be picked out
• Miner's quarry
• Source of iron
• It may have a silver lining
• Assayers' stuff
• Tram filler
• Malachite and others
• It's fine for a refinery