Related Clues:

• Natural resource
• Metal-bearers
• Kind of deposit
• Cinnabar, for one
• Prospector's prize
• Blast furnace input
• Miner profits?
• Assayer's subject
• Sourdough's strike
• Specimen for an assayer
• Find for 8-Across
• They're found in pockets and seams
• Silver or iron, e.g.
• Deposit in some banks
• Pitchblende and bauxite