Fractal thingy 606
Witwatersrand is a sedimentary rock set in South Africa that it quite special. It is a set of ancient rivers that eroded the nearby mountains. These mountains were full of gold and uranium. Normal sedimentary rocks don't often hold urainium though because urainium in the presence of oxygen becomes a water soluble form, so it doesn't get preserved. But because these rocks formed in the Archean (more than 2.5 billion years ago) when there was not much oxygen around.
Either way, the combination of a great sedimentary basin, during a time when it was possible to form and be preserved for billions of years has made it a world class gold and urainium mine producing 40% of the gold ever mined.
The shape of this fractal reminded me of a river delta with all it's branching arms. So another splits eliptical fractal, but I fell I am closer to learning how they work.