USING ERT TO LOCATE A HISTORICAL MINE TUNNEL
2012
Existing tunnels in historical mine sites often serve as conduits for acid mine
drainage thus, delineating them can be important in remediating these sites. In a
recent field study, electrical resistivity tomography was successfully used to locate a
tunnel in a former mining district in the Rocky Mountains of Colorado. Prior to the
ERT survey, a combination of historical mine data and surface geophysical surveys
were used to find the approximate location of the tunnel. This culminated in
drilling of boreholes on both sides of the location of the tunnel. Cross-borehole ERT
was then used to provide a final estimate of the tunnel location. Surface-to-hole
ERT surveys were conducted near a second, known portion of the tunnel to
determine the feasibility of finding the tunnel using only a single borehole. In
addition to the ERT surveys, an electrode was placed inside the entrance to the
tunnel and used to perform mise-a-la-masse (MALM) surveys with receiving
electrodes at the surface and in the borehole.
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