it was decided to test one possible depressant.Sodium cyanide (NaCN) had been shown previously to be a depressant for natural gersdorffite (Senior et al., 2009) and also for a combination of niccolite and gersdorffite in a nickel concentrate (Qun and Heiskanen, 1990).The effect of NaCN on niccolite flotation alone was tested in this work.