Related Clues:
- Tram cargo, perhaps
- They're mined, I tell ya!
- Extraction candidate
- Underground-railroad cargo
- Mine content
- Eugene's state: Abbr.
- Smelters' raw materials
- It may have a lead part
- Magnesium source
- Iron sources
- Miner's discovery, perhaps
- Miner matters?
- It needs refining
- Klondike find, perhaps
- Mineral bearing rock