Related Clues:

• Seam material
• Bucket conveyor's load
• Calif.'s northern neighbor
• Pyrite, e.g.
• Tramcar cargo
• Pac. NW state
• Dig this
• Alcoa purchase
• Mine rocks
• Ida. neighbor
• Assayer's concern
• Iron or gold source
• Underground wealth
• See 75-Across
• Assay specimen