includes fish, amphibians, reptiles, birds and mammals was recovered. Mammals ranged in size from rodents to mammoths, including an array of proboscideans, perissodactyls and artiodactyls, alongside rare carnivores. In total, 29 taxa, including the oldest Ancylotherium and Megalotragus fossils in southern Africa were recovered. Some of the taxa from Matjhabeng are shared with Langebaanweg, and others with Makapansgat, confirming the intermediate status of this locality. Isotopic analysis revealed the earliest indication of extensive grasslands in South Africa, though these grasslands were part of an environmental mosaic that included significant woodland, and probable wetland, components. Demographics According to the 2011 census, Welkom proper had a population of 64,130 people in an area of , a population density of . 60.7% of the inhabitants described themselves as "Black African", 26.9% as "White", 11.1% as "Coloured" and 0.9% as "Indian or Asian". Economy Mining Gold and uranium Welkom's economy centres on the mining of gold and uranium and is the hub of the Free State Goldfields. Welkom has contributed 21% to the free world's gold sales. The city and immediate surroundings are dominated by the headgears and reduction plants of several gold and uranium mining companies, including St Helena, Unisel, Welkom, Western Holdings, Free State Geduld, President Brand, President Steyn, Erfdeel Dankbaarheid, Phakisa, and Tshepong. Recent discoveries In Sept 2016 Harmony Gold and its partner White Rivers Exploration declared a as to then unknown gold ore body near the current Target shaft. This resource is estimated to have a mine life of about 30 years. Coal Welkom also has significant coal reserves. The Theunissen coal field is located in the districts of Theunissen and Bultfontein, only some 12 km to the south of Welkom. The section of the reserve able to be mined covers an area of more than 23,500 hectares. Diamonds Located about 7.5 km from Welkom, a kimberlite pipe, was discovered in 1890 and mined from a single shaft until the start of the Boer War in 1899. Mining continued after the war until a major aquifer, which was encountered at a depth of 259m, forced the mine to close. It was eventually re-opened by Samada Diamonds Pty Ltd and closed again in the early 1990s. Petra Diamonds operated the Star mine, a fissure 40 km south of Welkom. The Star mine was renowned for its consistent production of high value diamonds. In 2013, Petra commenced a disposal process of its