Related Clues:

• They're mined, I tell ya!
• Smelters' raw materials
• Iron sources
• Miner matters?
• Miners' quests
• Sources of metal
• Bauxite and borax, e.g.
• Metallurgists' supplies
• Lodes
• Mispickel and bauxite, e.g.
• Tram fillers
• Tram car fillers
• Graded materials
• Rich rocks
• Refinery needs