South Africa is the nation where people rushed to South African city to dig out gold.
It's not the only phenomenon in one country, but also happened in other countries where someone struck a gold vein.
To earn money and live there temporarily, it will be the best place. But, what we need on a daily basis is water and electricity. Especially, gold veins tend to be located in barren land. So, it would be difficult to get pure water. In the long run, it's inconvenient to live there under unstable water supply.
Though I don't know whether or not Cape Town is in its case, you had better consider availability of everything you need on a daily basis when planning to move overseas.