EXTECH-IV is a multidisciplinary study designed to improve the geoscience framework and develop exploration technology for unconformity-type uranium deposits of the Athabasca Basin. This paper reports on the seismic reflection & auxiliary downhole seismic surveys conducted within the McArthur River mining camp, Saskatchewan, as part of the study. It describes the acquisition of the seismic data sets, the objectives of each of the surveys, and some preliminary results for the two-dimensional high-resolution survey and the high-frequency vertical seismic profile.