Seven years. Sima Coal Industry Co., Ltd. is a holding subsidiary of Shanxi Lu 'an Group Company. According to February 20 19 and February 20 14, the development of Sima coal industry has also entered a new stage of development, and the existing recoverable coal reserves can only maintain the output of about 10 years. As of June 6, 2022 10, there are still seven years left. Lu Shanxi An Group issued an order to optimize and upgrade the energy industrial structure.