The 'Silver Mine' above Pniel in the Cape was driven into the Simonsberg in the 1740's. At that time the Dutch East India Company was running short of gold and silver, the only thing the traders of the Spice Islands or India would accept. After all, apart from wool, maybe, they produced better quality materials and goods, silks and pottery, for example, than the west could provide. That way of doing business predated even the Portuguese. Initially, the Arab traders had set up a triangle of trade which included gold from Greater Zimbabwe, in itself a trading post for gold and, reportedly, tin and copper, from sub Saharan Africa. Following the details of that trade led me to East Africa and a place called Kilwa in Tanganyika.
The picture is of the Simonsberg with its Cape finebos cover and the views of the Dwarse River Valley from there are magnificent.