In 2000 – 2001 BHP Billiton Minerals (WAMEX report A064098) explored the Mount Charles and completed two diamond drillholes targeting coincident gravity and magnetic anomalies.
BHP believed that the Musgrave Complex had potential for IOCG – type mineralisation based on exploratory work completed by Western Mining Corporation some years previously. BHP’s two drillholes intersected mafic intrusive rocks and interpreted metasediments. Most importantly, the drilling showed pervasive fine grained hematite alteration, a common feature of IOCG – type deposits.
The drilling appears to occur on the northern flank of more recent regional gravity survey data, which suggests the BHP drill holes were ~4km too far north.