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The last three decades have seen significant mining development in the northern regions of Canada, where the freeze and thaw cycleof permafrost and corresponding surface subsidence and heave represent a significant challenge at all mining stages, from the designof infrastructures to the monitoring of restored areas. Over the past ten years, SAR interferometry has been widely used to monitorground surface deformation. With this technique, changes in phase between two SAR acquisitions are used to detect centimetre tomillimetre surface displacements over a large area with high spatial resolution. This paper presents the results of a project that aimsto develop a SAR solution to provide useful information for environmental monitoring and assessing the stability of mining sites.RADARSAT-2 and TerraSAR-X images acquired during the summer of 2014 were used to measure the displacements of groundsurface, infrastructures and stockpiles caused by seasonal changes in permafrost extent. The study area is an open-pit mine located inNunavut, northern Canada, in the continuous permafrost zone. Results shown that surface displacements calculated fromRADARSAT-2 and TerraSAR-X are very similar and in agreement with scientific and terrain knowledge. Significant displacementswere observed in loose soil areas while none was detected in bedrock and rock outcrop areas. The areas most affected by active layerchanges showed surface subsidence during the thaw settlement period. Thus, InSAR can be used as a tool to guide the siting anddesign of new infrastructure as well as highlighting risks in areas of unstable terrain

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

INTEGRATED SAR TECHNOLOGIES FOR MONITORING THE STABILITY OF MINE SITES: APPLICATION USING TERRASAR-X AND RADARSAT-2 IMAGES