The Electric FurnaceElectric furnace at BHP’s Olympic DamOlympic Dam Copper SmelterCopper smelter treats slagSlag from the Direct-to-BlisterBlister Flash FurnaceFlash furnace (DBF), reducingReducing copperCopper content from 25 to 4% on average. Temperature profilesTemperature profile in slagSlag and blisterBlister were measured at different power factorPower Factor (PF) values. The results show that the temperature profileTemperature profile in slagSlag is more uniform during the period of tappingTapping DBF slagSlag into the EF but tends to vary with bath level during other periods of the process. The difference between slagSlag temperature and blisterBlister temperature tends to decrease at lower power factorPower Factor (PF). These results have been applied to improve process controlProcess control.