of 16 mg/L which is more than 220 times safe levels. This has resulted in Robinson Lake being declared a radioactive area and it is closed off to the public. The general consensus is that this has been caused by acid mine drainage, or AMD. It is also however now a dangerous area and nothing is being done about the number of people accessing it. Climate Randfontein lies at 1,709 m above mean sea level. (By comparison, Johannesburg is at 1,733 m AMSL at the entrance to the Carlton Centre in the CBD, and Pretoria is 1,320 m AMSL in the middle of Church Square in the CBD). The climate here is mild in winter (sunny clear days and cold nights), and generally warm and wet in summer, dominated by thunderstorms. When compared with winter, the summers have much more rainfall. This location is classified as Cwb by Köppen and Geiger (dry winter, subtropical highland climate). The average annual temperature is 16.1 °C (60.9 °F). The rainfall average is 742 mm (29.2 inches) per year. Demographics As of 2011, Randfontein has a population of 149,286, which incorporates Mohlakeng and Toekomsrus. (In 2001, the population was 128,731.) The average elevation of the town is 1709m above sea level. The total municipal area, after recent restructuring, is 475km2 (183 sq mi). According to the Randfontein Socio-Economic Survey of 2006, Randfontein's population is divided into Black (79.2%), White (10.6%), Coloured (10.1%), and Asian/Indian (0.1%). The local immigrant population is made up mainly of Mozambiquans (Portuguese), Angolans (Portuguese), Malawians (Chichewa), Ethiopians (Amharic), and Chinese (Chinese). A fair portion of shops in the CBD are run by Ethiopians and Chinese. Randfontein differs slightly from other parts of the West Rand, in that it is slightly female dominant (50.6%). This trend is throughout the gender structure with the exception of the age group younger than 14 which is slightly male dominant. The working age-group (15 to 64) is the largest and makes up 65.5% of the local population. The elderly group (above 65 of age) constitutes only 6.1% of the population. During apartheid, Randfontein was mostly Afrikaner. The racial makeup and language distribution changed dramatically from the 2001 census to the 2011 census. The Black population grew from around 16% of the total population to around 41% of the population. Dominant languages now are Tswana, Sesotho, English, and Afrikaans, with many other languages being spoken, both