Related Clues:

• Vein contents
• Tram loads
• Mined-over matter?
• Rock group
• Bauxite and others
• Lode deposits
• Vein stuff
• Galena and hematite, e.g.
• Metal-bearers
• Blast furnace input
• Miner profits?
• They're found in pockets and seams
• Pitchblende and bauxite
• Subjects of assays
• Unrefined metals