Related Clues:
- Valuable diggings
- Tram's cargo
- Valuable unrefined rock
- Substance from which the metal Fe is extracted
- Valuable resource — gold — hoarded by Irish individual
- It's targeted for extraction
- Stuff in many 57-Across
- One of those heavy metal Deep Purple types with No 1 ran off initially with one of the sisters
- Rocks for a refinery
- Buried treasure?
- Rock worth unearthing
- Celestite, e.g
- Nickel source, e.g
- Resource in the board game The Settlers of Catan
- Many a substance ending in '-ite'