Hersov is the son of Basil Hersov, who ran AngloVaal Mining Ltd., the company founded by his father and once one of South Africa’s biggest mining companies. Chris Chadwick, a former director of Sibanye Stillwater Ltd., is chief executive officer.

The offer for about $300 million of stock has been “heavily oversubscribed,” Rob Hersov said.

“There are a lot of interesting mining companies and assets looking for capital to expand,” he said.