In 1992, Placer Dome identified IP and magnetic anomalies with coincident Au-Ag-Cu geochemical highs at the Cas area, including rock samples up to 2.3% Cu, 695 ppb Au, and 106 g/t Ag, indicating a sulphide-bearing system with porphyry potential at depth. The resistivity response was strong over the mapped intrusion (up to 8000 Ohm-m) revealing a high-potential target, with IP chargeability highs (up to 73 msec). This high chargeability and low resistivity response is typical of disseminated sulphide mineralization which occurs in porphyry copper systems.