Related Clues:

• Pitchblende and bauxite
• Subjects of assays
• Miners dig it
• Unrefined metals
• Rockhound's find
• Nickel in a pocket, perhaps?
• Quarry product
• Mining take
• Ones in need of refinement
• They may be driven to extraction
• Miner's load
• Refinement targets
• Iron and copper, e.g.
• Miner samples
• Vein filler