Related Clues:

• Source of scandium
• Result of a vein search?
• Mine car cargo
• Seamy stuff?
• Uranium source, e.g.
• For miners it's major
• Coal vein
• It's totally unrefined
• Metal on its way to a refinery
• Metal in the raw
• Mine treasure
• Refiner's supply
• Gold container, perhaps
• Stuff to refine
• Subject of an assay test