Related Clues:

• Underground find
• Mineral quest
• Tram locale
• Valuable find in the ground
• Useful mineral
• Good source of iron?
• Lorry lode, perhaps
• Blast furnace stuff
• Valuable stuff from down under
• It's S of Wash.
• Mineral-bearing rock
• Mispickel or zinc
• Argentite, e.g.
• A miner matter?
• Diamond source