Shanxi possesses 260 billion metric tons of known coal deposits, about a third of China's total. As a result, Shanxi is a leading producer of coal in China and has more coal companies than any other province, with an annual production exceeding 300 million metric tonnes. The Datong (), Ningwu (), Xishan (), Hedong (), Qinshui (), and Huoxi () coalfields are some of the most important in Shanxi. Shanxi also contains about 500 million tonnes of bauxite deposits, about a third of total Chinese bauxite reserves. Industry in Shanxi is centered around heavy industries such as coal and chemical production, power generation, and metal refining. There are countless military-related industries in Shanxi due to its geographic location and history as the former base of the Chinese Communist Party and the People's Liberation Army. Taiyuan Satellite Launch Centre, one of China's three satellite launch centers, is located in the middle of Shanxi with China's largest stockpile of nuclear missiles.