The content of the trace ferrides - Ti, V, Cr, Co, and Ni - in the magnetite ores of the Mount Hope mine in northern New Jersey has been spectrographically determined. Chemical consanguinity of 2 ore shoots in different wall rocks, vein fillings, and tenuous ore webs is demonstrated. This similarity extends over 17 Fe mines sampled in the New Jersey highlands. Possible vertical zoning within the Mount Hope mine and distinct zoning in the district with a focus at Split Rock Pond is recognized. The marked differences in trace ferride content between walls and ore in contrast to the strong similarities of trace ferride content among massive ore shoots, small veins, and webs, are evidence for a hydrothermal origin of these deposits.