Related Clues:

• Comstock output
• Band of gold?
• See 38-Across
• Bauxite or hematite
• Mesabi Range yield
• Change from a krone
• It lacks refinement
• See 5-Down
• Some can dig it
• Monetary unit being replaced by the euro
• Valuable rocks
• It's found in the ground
• Profitable extraction
• Lucky strike
• Tramload