Benoni was established as a mining camp after the local discovery of gold in 1887. The local mining chairman, Sir George Farrar, landscaped the valley in the early 1900s, and Benoni was officially declared a town in 1907. It is now part of the industrial complex of the Witwatersrand and is particularly noted for its iron and steel works and brass foundry. O.R. Tambo International Airport is immediately northwest. Pop. (2001) 94,341.