Solution & Results
3vG analyzed 57 images taken over 16 months by the TerraSAR-X satellite. Of these images, 29 were taken when the satellite was looking east and 28 when the satellite was looking west. While a particular look direction may have limited sensitivity to certain slopes, due to motion along the slope being perpendicular to the satellite line of sight or the slope not being visible to the satellite, the other look direction almost always has good sensitivity to displacement along that slope. By combining the data from two different look directions, 3vG was able to obtain complete coverage over the mine site. With this dual-look processing, 3vG was also able to derive the direction of displacement for all points measured with both look directions.
Significant displacement approaching 25 cm/year was detected in the main pit and multiple slopes in the immediate vicinity of the main pit were also found to be moving at rates greater than 5 cm/year. While parts of the tailings facilities were found to be sinking at 20 cm/year, the tailing’s dam wall was found to be stable, with no significant displacement detected along the dam wall.