mineralogy of a copper sulphide ore indicated chalcopyrite (CuFeS₂) to be the only copper-bearing mineral that is associated with pyrite (FeS₂) as the sulphide gangue mineral. For simplicity, assume that the rest is quartz/silica (SiO₂) as non-sulphide gangue portion.

1. If this ore has 1.14% Cu, 7.67% Fe, what is the amount of chalcopyrite, pyrite and quartz/silica gangue in % (by weight) assuming that gangue does not have copper or iron.
2. What are the total sulphur content and overall density of this ore based on the individual properties of mineral components?
3. Suppose that this ore is crushed/ground and processed to produce a copper concentrate. The slurry leaving the grinding circuit for mineral separation has a pulp density of 38% (by weight). How much water needs to be added per dry tonne of ore?