In 2018, GCS Geotechnical undertook a dolomite stability investigation in Kathlehong near Vosloorus for the proposed Credi Reservoir. The site was underlain by soft weathered altered dolomite (WAD) and overlain by syenite residuum.
The investigation required the drilling of both percussion and rotary-cored boreholes as well as pressure-meter tests. The inherent hazard class of the dolomite was determined, and foundation recommendations provided. This included a compacted reinforced earth mattress and concrete raft foundations.