Related Clues:

• It's pursued in vein
• Neighbor of Mont.
• See 63-Across
• It may be picked
• One on the move
• Miner's quarry
• Source of iron
• It may have a silver lining
• Tram filler
• Muckraker Tarbell
• It's fine for a refinery
• Pay dirt
• Neighbor of Calif.
• Miner's quest
• Lead ___