Related Clues:

• Prospector's prize
• Blast furnace input
• Levi's line
• Assayer's subject
• Sourdough's strike
• Specimen for an assayer
• Find for 8-Across
• Silver or iron, e.g.
• Deposit in some banks
• Coal or skirt line
• Stratum of coal
• Miners dig it
• Rockhound's find
• Nickel in a pocket, perhaps?
• Quarry product