What are the requirements for handling the qualification of mine engineering construction?

General contracting qualification standard for mine engineering construction The general contracting qualification for mine engineering construction is divided into three levels: super-grade, first-grade, second-grade and third-grade qualification standard. The net assets of the enterprise are more than 8 million yuan. The main personnel of the enterprise (1) shall be no less than 4 registered construction engineers in mining engineering and no less than 1 person in electromechanical engineering. (2) the technical director has served for more than 5 years.