Hey there little one, do you know what a basin is? It's like a big bowl or a hole in the ground where things collect. The Witwatersrand Basin is a really big basin in South Africa where a lot of gold was formed over millions of years.
Okay, so let me explain it more. Millions of years ago, the area that is now the Witwatersrand Basin was covered by a big sea. Over time, as things changed, some of the mountains in the basin eroded away and the rocks that were left behind had gold in them.
Now, you might be wondering how those rocks with gold in them got formed in the first place. Well, it's a bit complicated but basically it has to do with underground pressure and heat. The gold particles were formed in veins in the rocks and when the rocks eroded away, the gold particles were left behind.
So, people started mining the gold in the Witwatersrand Basin in the late 1800s and it became one of the richest gold mining areas in the world. Today, the basin has many different types of minerals and rocks that are still being extracted for different uses.
So, that's a basic explanation of the Witwatersrand Basin. It's a big hole in the ground in South Africa where lots of gold was formed a long time ago and people still mine for it today.