Tianjn is rich in natural resources. Over 30 kinds of metallic, nonmetallic ores and fuel minerals have been found. The main ores include chambersite, manganese, gold, tungsten, molybdenum, copper, lead, zinc etc, among which chambersite was discovered for the first time in China. The major non-metallic ores are: cement limestone, barite, stromatolite, marble, natural oil tone, pottery clay, maifanshi porous stone etc. The principal fuel deposits are petroleum, natural gas, coal and coal gas. Both the Dagang and Bohai oilfields in the southeast of Tianjin are well-known oil gas field in China. Tianjn is also rich in geothermal resources covering an area of 2968 square kilometers. Tianjin produces a large quantity of salt. With a sodium chloride content as high as 96-98%. It is an important raw material for the marine chemical industry. There are over 270 square kilometers of barren and silt land awaiting exploitation and will serve as ideal ground for developing petrochemical and marine chemical industries.