Shandong Hengda Coal Industry Co., Ltd. (Maozhuang Coal Mine) is located in Maozhuang, Gangcheng Town, Ningyang County, Shandong Province, and belongs to Heze Coal Management Bureau. The nature of the enterprise is local state-owned, and it was transformed into joint-stock system on April 28th, 1997. The well was built by the army in February 1970, and officially put into production on March 6 1972, with an annual design capacity of 90,000 tons. 1976 was handed over to Heze area for operation. 1977 Shandong Coal Design Institute compiled the capacity expansion and transformation scheme design of Maozhuang Coal Mine, with a designed production capacity of 200,000 tons/year. 1April, 1997, the design room of Shandong Coal Industry Bureau and Hengda Coal Industry Co., Ltd. carried out the preliminary design of the expansion project. 1On May 28th, 1997, Shandong Coal Industry Bureau approved "Lu Mei Shengzi (1997)No. 160" and "Reply on the design of Maozhuang coal mine expansion project in Heze area", and determined the production capacity as150,000 tons/year.
/kloc-0 was restructured into Heze hengda coal industry co., ltd in ningyang county, Shandong province in April, 1997, and changed its name to Shandong hengda coal industry co., ltd in February, 2006.