Related Clues:

• Vein contents, perhaps
• Bauxite or galena
• Iron, for one
• Galena or cinnabar, e.g.
• Refinery supply
• Something to slag
• Aluminum source
• Mineral source
• Copper, for one
• Prospector's goal
• Swedish coins
• Gold source
• Lode material
• Mined matter
• Mineral bearer