Related Clues:

• Pay dirt
• Miner's quest
• OPEC concern
• Lead ___
• Cruet filler
• Drilling target
• Loosen, in a way
• Bauxite, e.g.
• Painter's medium
• Subject of testing
• See 71-Across
• Zoomed
• Hematite, for one
• Bauxite or magnetite
• It might be picked apart