tokens: It was learned that , China has planned to take advantage of the rich oil gas resources in this area during the " ninth five - year plan " -LRB- 1996 to 2000 -RRB- , through methods such as introducing foreign investment , jointly raising funds with the locality , etc. to build a large - scale combination project of the natural gas industry and the salt industry , which will be capable of producing 120,000 tons of PVC , 100,000 tons of caustic soda , 200,000 tons of synthetic ammonia , and 300,000 tons of carbamide .