Izinto zensimbi zihlukaniswe izigaba eziyisithupha:

(1) Insimbi ye-P

(2) M- insimbi engagqwali

(3) Insimbi ye-K-cast

(4) Izinsimbi ezingenayo i-N-non-ferrous

(5) S- ingxubevange ukumelana nokushisa

(6) H-insimbi eqinile