Related Clues:

• They're not refined
• See 9-Down
• Metal containers
• They may be picked out
• Miner's quarry
• Assayers' stuff
• Malachite and others
• They come out at the seams
• Bonanza
• Vein materials
• Pay dirt
• They may be refined
• Miner's quest
• Raw materials
• They could use some refinement