- Lead smelting and refining (primary) (1)
- Precious metals (14)
- Gold refining (primary) (2)
- Silver refining (primary) (2)
- Silicon refining (primary, over 99% pure) (1)
- Silicon, pure (2)
- Babbitt metal (primary) (2)
- Cadmium refining (primary) (1)
- Cobalt refining (primary) (1)
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