Related Clues:

• Raw materials
• They could use some refinement
• Bauxite, e.g.
• Subject of testing
• They're in vein
• Groundbreaking discoveries?
• Zoomed
• Hematite, for one
• Rock groups?
• Bauxite or magnetite
• It might be picked apart
• Smeltery supply
• They're in veins
• Valuable find
• Miner concerns