Possible Clues:

• Rock from which a metal can be extracted
• Magnetite or taconite
• Magnetic mineral
• Furnace input
• Nero or I (anag) — from which a common metal comes
• Haematite, for example — Nero or I (anag)
• Good discovery for a miner
• Material for a smelter
• Raw material for a steel mill
• Substance from which the metal Fe is extracted