There are two concordant series of rocks within this NE Siberian intrusion. Each consists of a number of differentiates ranging from dunites to titanomagnetite gabbro. The ultrabasic differentiates contain dispersed sulphides and chromitites and the upper ones, dispersed titanomagnetite. The distribution of Ni, Co, Cr, Ti and V in the rocks and mafic minerals has been analysed. It is shown that the maximum concentrations of Ti and V are typical of the upper differentiates (titanomagnetite gabbro), while mafic minerals, mainly olivines, contain a considerable concentration of Ni. -C.N.