Related Clues:

• Discovery in a seam
• Metal-filled rocks
• They're mined and refined
• Smeltery material
• Nickel source
• Mineral bearing rock
• Smelting need
• See 112-Down
• It's refined
• Mineral deposit
• Refinery rocks
• Prospector's discovery
• Forty-niner's find
• Metal deposits
• I-5 state