Related Clues:

• Galena and hematite, e.g.
• Rich vein
• Road cover
• Metal-bearers
• Blast furnace input
• Miner profits?
• Sourdough's strike
• They're found in pockets and seams
• Mother follower?
• Pitchblende and bauxite
• Place to withdraw a deposit
• Subjects of assays
• Unrefined metals
• Mining take
• Ones in need of refinement