Now, this is interesting. The Ngwenya Mine in Swaziland is the oldest artificial human mine currently known, at 41,000 to 43,000 years old. Various iron ores were mined from here.
In modern times, however, efforts to revive commercial mining have not been so successful. After the flood, foreign mining companies left. A few years later, mining operations native to the local country started, but not without a lot of corruption and eventual cancellation once again.
20200720/DuckDuckGo Ngwenya swaziland mine
20200720/https://en.wikipedia.org/wiki/Ngwenya_Mine