Mining of chemical and fertilizer minerals
(a) extraction of salt, see 0893; (b) roasting of iron pyrites, see 20119; (c) manufacture of synthetic fertilizers and nitrogen compounds, see 2012
Perlombongan mineral kimia dan baja
(a) pengekstrakan garam, lihat 0893; (b) penyalaian besi pirit, lihat 20119; (c) pembuatan baja sintetik dan sebatian nitrogen, lihat 2012