Consider the average chemical compositions of the following two PGM concentrates: Compare the two expected slag liquidus temperatures of these concentrates by normalising the slag compositions to the SiO2MgOFeO x system. Estimate the amount of FeO in the slag by assuming the following sulphide phases are present in the concentrates: [Ni,Fe9S8 (pentlandite), with Co substituting for Ni, and with a Ni:Fe molar ratio of 1:1. CuFeS2 (chalcopyrite) FeS (pyrrhotite)