Related Clues:

• See 38-Across
• Aperture
• Bauxite or hematite
• Mesabi Range yield
• Change from a krone
• Leave high and dry
• It lacks refinement
• See 5-Down
• Ace place?
• Some can dig it
• Valuable rocks
• It's found in the ground
• Profitable extraction
• Flag location
• Lucky strike