Thirty-five samples were selected from diamond drill-hole cores that intersected the contact between the Virginia Formation and Partridge River Intrusion at the NorthMet, Mesaba, and Wetlegs deposits (Fig. 1 and Appendix A). Bedded Pyrrhotite Unit samples from the contact aureole come from boreholes AA-18 and A4-15. Xenoliths of the Bedded Pyrrhotite Unit, plus norites and gabbronorites, were collected from the NorthMet and Mesaba deposits (Fig. 1 and Appendix A). Data were combined with results from previous studies for a total database of 126