The cache is a micro, however the container is slightly larger than a 35mm film canister and can only take small trading items. WATCH OUT for the razor wire!! PLEASE use extreme STEALTH mode to ensure longevity of this cache.
A big thanks to Prof for this info ;-).
Prof. Carl Anhaeusser of the Geology Department at WITS says "Regarding the geology underlying the various water towers on the Jo’burg Dome, I can tell you that most of them are on the fault zone that extends from east of the Northcliff Ridge across the Dome in a NNE direction towards Pretoria. The Dome has many fault zones, examples being the prominent ridge that forms the Randpark Ridge area. These fault zones are crush zones in the granites that have allowed fluids carrying silica to move up through the broken rock, replacing various granite minerals and introducing quartz veins (the silica) into the broken and sheared granites.
The result is that the siliceous crush or fault zones are rendered more resistant to weathering and erosion than the surrounding granites. Hence the zones emerge as ridges protruding above the surrounding terrain.
The biggest of all the many fault zones is the one that passes NE from Northcliff through Randburg towards Bryanston and beyond to Kyalami and then on to Pretoria. The ridges being on higher ground are ideal spots to site water towers as they provide a ‘head’ allowing for gravity distribution of water to the suburbs in lower lying areas. Thus no pumping is required to get the water into people's homes. All they have to do is keep the towers filled and they are then drained off when people open their taps".