- Lead and zinc (2)
- Lead smelting and refining (primary) (1)
- Zinc refining (primary), including slabs & dust (2)
- Zinc smelting (primary), including zinc residue (1)
- Precious metals (7)
- Platinum group metal refining (primary) (3)
- Silicon and chromium (2)
- Silicon, pure (3)
- Beryllium metal (1)
- Titanium metal, sponge and granules (1)
- Zirconium metal, sponge and granules (1)
