Related Clues:

• Smelted stuff
• Gold digger's aim
• Metals in the rough
• Metallurgist's study
• It passes through adits
• Hidden treasures
• Metal sources
• Rocky riches
• It's mined and refined
• Bauxite and chromite
• Raw rock
• Seam material
• Bucket conveyor's load
• Calif.'s northern neighbor
• Pyrite, e.g.