Yumen (, literally, "Jade Gate,") is a city in western Gansu province, China. It is a county-level city with a population of 106,812 (2002 est.), and is part of Jiuquan "prefecture-level city" (a multi-county administrative unit). It is located on the Silk Road and is best known for its oil production. The city's name is often confused with the Yumen Guan or Jade Gate which is the frontier-pass of ancient times, the entrance to the old Silk Roads, which was situated not far to the west of Dunhuang. Although both Yumen City and Yumen Gate are within Jiuquan, the latter is some to the west from the former. In 2014, areas of the city were sealed off after a resident died of the bubonic plague. Districts of the city which house up to 100,000 were turned into quarantine zones. The city allocated 1 million yuan to be used for emergency vaccinations. History The site of Yumen was brought under Chinese control around the end of the 2nd century BCE. Yumen was known as 'Huiji' in the 5th century when the area was reclaimed by the Northern Wei Dynasty (386–534/535) and was soon after renamed back to Yumen in 581. Under the Tang Dynasty (618–907), Yumen's county seat was located at Chijinzhen which is east of the present Yumen City. The city was then under Tibetan control around 770 CE for some 70 years. After the Tang dynasty, Yumen became a part of the Western Xia (1038–1227). During the Ming dynasty (1368–1644), the area came under Tibetan control again and was only reestablished later on in the early Qing dynasty (1644–1912). In 1939, the first oilfield in China was established at Yumen. Administrative divisions Yumen City is divided to 1 subdistrict, 10 towns, 2 ethnic townships and 5 others. Subdistricts Xinshiqu Subdistrict () Towns Ethnic townships Xiaojinwan Dongxiang Township () Dushanzi Dongxiang Township ( Others State-owned Horse Drinking Farm() State-owned Yellow Flower Farm Dongxiangzu Township() Gansu Nongken Yusheng Agricultural Company() Gansu Provincial Agricultural Reclamation Construction Engineering Company() Gansu mining area() Economy The overland route to Western Asia from China flourished until the end of the Tang dynasty. Furthermore, due to increased use of sea transportation, Yumen became a backwater. There were two catalysts for Yumen's rapid revival in the 1930s and 40s. The construction of a modern highway over the old caravan route from Yumen to Ürümqi (capital of the Uygur