Related Clues:
- Seam sample
- It runs in veins
- Copper container, perhaps
- Vein pursuit?
- It's picked out of a mine
- Something to be assayed
- 45D homonym
- Mined rocks
- Zincite, e.g.
- "Buried" treasure found in 17-, 27-, 44- and 59-Across
- Bauxite, for example
- Metal-in-the-rough
- It forms igneous rock
- Nickel in a pocket?
- Mined stuff