Related Clues:

• Magnetite, e.g.
• Taconite, e.g.
• You can dig it
• Smeltery input
• Mesabi Range yield
• Smelter input
• Hematite, for one
• Metal-bearing mineral
• Smelter stuff
• Taconite or siderite
• Miner's discovery
• Mined find
• Miner's find
• Mined-over matter?
• Blast furnace input