Stilfontein is a former mining town which is located on the N12 with 17,942 inhabitants, situated between Klerksdorp and Potchefstroom in Nort…Stilfontein is a former mining town which is located on the N12 with 17,942 inhabitants, situated between Klerksdorp and Potchefstroom in North West Province of South Africa. It was incorporated into the City of Matlosana and some municipality administration is located in Matlosana.