In order to investigate sequences of mine tailings that have settled in the bed of the Coeur<br>d’Alene River, we improvised ways to make geophysical measurements on the river floor. To<br>make ground penetrating radar (GPR) profiles, we mounted borehole antennas on a skid that was<br>towed along the river bottom. To make induced polarization (IP) profiles, we devised a bottom<br>streamer from a garden hose, Pb strips, and insulated wire. Both expedients worked well. GPR<br>showed shallow stratigraphy, but did not directly detect the presence of contaminating metals. IP<br>showed a zone of high chargeability that is probably due to pockets of relatively higher metal<br>content. Neither method was able to define the base of the fluvial tailings section.


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