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Related Clues:
- Underground treasures
- Pitchblende and cassiterite, for two
- Metal-bearing minerals
- Underground sources of income
- Smeltery needs
- Mineral sources
- Tram loads, often
- Prospectors' prizes
- Tram contents
- Bauxite and galena
- Metal-filled rocks
- They're mined and refined
- Smeltery material
- Refinery rocks
- Metal deposits