Related Clues:

• It lacks refinement
• See 5-Down
• Neighbor of 27-Down
• Some can dig it
• Valuable rocks
• 'Reflections on Ice-Breaking' poet
• It's found in the ground
• Wharton grad, maybe
• X
• Profitable extraction
• Business bigwig
• One of the Four Corners states
• Lucky strike
• Tramload
• See 51-Down