Related Clues:

• Discovery of mine?
• Stuff in a vein
• Iron or lead source
• Smelter's material
• What miners seek
• Extractable resource
• Claim discovery, perhaps
• Unprocessed rock
• Geological vein content
• Bornite or bauxite
• Picked out rock?
• Deposit makeup
• It could be carried in a cart
• Strike yield
• Pickax-wielder's resource