Mining of chemical and fertilizer minerals

This class includes: - Mining of natural nitrogen salts, natural potassium salts, or natural phosphates; - Mining of native sulphur; - Extraction and preparation of pyrites and pyrrhotite, except roasting; - Mining of natural barium sulphate and carbonate (barytes and witherite), natural borates, natural magnesium sulphates (kieserite); - Mining of earth colours, fluorspar and other minerals valued chiefly as a source of chemicals. This class also includes: Guano mining.

This class excludes: - Extraction of salt, see 08930 (Extraction of salt); - Roasting of iron pyrites, see 20119 (Manufacture of other basic chemicals); - Manufacture of synthetic fertilizers and nitrogen compounds, see 20120 (Manufacture of fertilizers and nitrogen compounds).