Early Access Shaft area characterization has been done by multi-line 2D and VSP surveys. The focus was on structural features that influence the position selection of the shaft. Ten 2D Lines ranging from 1.2 to 2.5 km, 13 km in total were acquired. 8 levels, 3-components VSP acquisition of all 2D lines was done. 3D VSP acquisition by 80 receivers, from 20 shot points.
3D reflection and 3D VSP structural mapping was progressively achieved, with finer and finer detail characterization over more than two decades of surveying and multi-disciplinary data interpretation and integration.