The copper mineral grade of particles in flotation products(Con-1, Con-2 and Con-3) collected when flotation pulp was conditioned at different SIBX dosages is given in Fig. 5. It should be noted
that in Fig. 5, combined Cu mineral grade was shown instead of grade of bornite and chalcopyrite, because these two minerals are equally floatable in the presence of collector (Ackerman et al.,
1989).