Mining of chemical and fertilizer minerals

This class includes: - mining of natural phosphates and natural potassium salts - 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 excludes: - extraction of salt, see 08.93 - roasting of iron pyrites, see 20.13 - manufacture of synthetic fertilisers and nitrogen compounds, see 20.15