Related Clues:

• Specimen for an assayer
• Find for 8-Across
• Silver or iron, e.g.
• Deposit in some banks
• Miners dig it
• Rockhound's find
• Nickel in a pocket, perhaps?
• Quarry product
• Miner's load
• Get the gold?
• Vein filler
• Raw rock
• Miner's strike
• Mine output
• Slag source