Related Clues:

• They're the reason we search in vein?
• Power shovel excavations
• Prospectors' finds
• Metal-yielding rocks
• Sedimentary rock layers
• Rock groups
• Stuff to smelt
• They may hold the lead
• Buried treasures
• Refinery inputs
• Mines' output
• They're taken out of ranges
• They're removed from ranges
• Mineralogist's sample set
• Magnetite et al.