China Minmetals and China MCC are enterprise groups with "three specialties and three majors" in type and "four specialties and four majors" in quantity. MCC Tiangong Group Co., Ltd. is an important subsidiary of China Minmetals and China MCC. It has the special qualification of general contracting of construction, municipal and metallurgical projects approved by the Ministry of Housing and Urban-Rural Development and the corresponding Grade A qualification of engineering design industry.