Related Clues:

• Shell game?
• Rich deposit
• Benzene source
• Valdez cargo
• It gets checked with a stick
• Mesabi range find
• Metallic rock
• A load off one's mine?
• Mining target
• Veteran sailor
• Klondike find
• Smokers amass it
• See 123-Across
• Galena, e.g.
• Driveway surface