Petro Matad has relinquished 20.7% of the original area of Block XX, as required by Mongolian law. Block XX is now 10,343.15 km² in area. Surface geology, 2D seismic, gravity, and magnetic surveys confirm that the relinquished areas are un-prospective for hydrocarbons, and are underlain by “basement” rocks and areas of shallow sedimentary fill above basement rocks.