Related Clues:

• Unrefined metal
• It passes through adits
• Rocky riches
• It's mined and refined
• Limonite, e.g.
• Raw rock
• Seam material
• Bucket conveyor's load
• Calif.'s northern neighbor
• Pyrite, e.g.
• Tramcar cargo
• Mesabi Range wealth
• Pac. NW state
• Dig this
• Alcoa purchase