Related Clues:

• Source of iron or lead
• La Brea gunk
• Garage stain
• Crude resource
• Pit sight
• Mideast export
• Refinable rock
• Graphite, e.g.
• Car fluid
• Export of Indonesia and Venezuela
• It may be picked out
• Roof covering, perhaps
• Galena or hematite
• Highway sealer
• Refinery input