Related Clues:
- Galena and hematite, e.g.
- Metal-bearers
- Geological formations
- Blast furnace input
- Miner profits?
- They're found in pockets and seams
- Pitchblende and bauxite
- Subjects of assays
- Unrefined metals
- Mining take
- Ones in need of refinement
- They may be driven to extraction
- Refinement targets
- Iron and copper, e.g.
- Miner samples