JSE-listed diversified mining company Sibanye-Stillwater has built various innovative water treatment plants and is researching and developing new technologies to treat water, as well as extract valuable materials from the water it treats, Sibanye-Stillwater South Africa mine water treatment specialist Quinton Paulse said this week. During a seminar hosted by industry organisation the Southern African Institute of Mining and Metallurgy, he gave an overview of some of the plants the company operates, including zero-liquid discharge plants that are producing, as by-products, various chemicals that the company is using internally, such as calcium carbonate, besides others.