This paper describes a novel, high-resolution application of cross-borehole seismology at the Snap Lake diamond mine, Northwest Territories, to assess whether the relatively thin kimberlite dyke that hosts the diamonds could be mapped underground with sufficient resolution to accurately estimate its volume and to guide mining. Subsequent mining and mapping with the 50-by-70-metre test panel indicated whether the technique was able to map the top & bottom surfaces of the dyke and to identify ramps, pinch-outs, and cross-cutting fracture planes. The tests also compared the performance of that new technique with two other geophysical methods, high-frequency vibrating seismic surveying and ground penetrating radar.

This study uses newly acquired high-resolution seismic reflection data to present evidence of large-scale mass transport deposits throughout the Quaternary in southern Orphan Basin located off the northern slope of the Grand Banks. Mass transport deposits are those associated with slope failure and transport as slumps, slides, debris avalanches, or debris flows. The results reveal the types of mass transport deposits on the Basin slope & floor and their depositional pattern from the early Pleistocene to the present.