China University of Mining Xuzhou
Beisu Coal Mine of Yanzhou Mining Group Companies
Honghe Aged Science and Technology Association Mining Group
Huainan Mining Group Corporation Limited
Huainan Mining Group Department of Resources and Environmental Management
Huating Coal Mining Group Corporation Ltd
Xiezhuang Coal Mine under Xinwen Mining Group of Shandong Province
Yanzhou Coal Mining Group
Luan Mining Group Company
Zijin Mining Group Co.
紫金矿业集团股份有限公司紫金矿冶设计研究院
紫金矿业集团股份有限公司
Yunnan Gold Mining Group Co
Heilongjiang Longmay Mining Group Co.Ltd.
Lu’ an Mining Group Ltd.
Pingzhuang Coal Mining Group Company
change of mining technique from open pit mining to underground mining