This report summarises the results of all material testing covering the period from the initial investigations to date. Areas of material investigation mainly include petrographic description of rock, analyses of clays, concrete aggregate testing and rock strength testing of quartzite and dolomite. Results of material testing can be stated as: • Only two rock types occur over the dam site and quarry area, namely quartzite and shaly dolomite. The quartzite is felspathic and the shaly dolomite shows a variable carbonate content. Beneath quartzite outcrops the dolomite may become siliceous. • Only the quartzite is suitable for concrete aggregate. • Quartzite will be suitable for rock fill in Zones 1 and 4. Siliceous dolomite when available should also be suitable for these zones. • A slightly fresh to weathered shaly dolomite is suitable for Zone 3. • Breakdown of the shaly dolomite due to weathering problems a montmorillonite rich clay. • Quartzite shows an unconfined compressive strength within the range 85.5-296 M Pa. • Axial and diametral point load tests on the shaly dolomite give values 1.7-13.8 M Pa.