ELECTRICAL GEOPHYSICS FOR DEEP TUNNEL DETECTION AT A GOLD MINE REMEDIATION SITE

Surface and crosshole geophysical investigations, including time-domain dipoledipole resistivity and frequency domain Mise-a-la-Masse (MALM) surveys, were conducted on the Captain Jack Project, an EPA Superfund remediation site which includes the Big Five tunnel. The Mise-a-la-Masse survey used the main access tunnel as a transmitting electrode and recorded data on the surface above the tunnel using a pole-dipole configuration. The objectives of the surface geophysical investigation are two-fold: 1) Geologically characterize the host-rock and region in which the mineralized fault zone and associated mine tunnel system lies; and, 2) Determine the location of the mineralized zone and the associated tunnels, if possible.