How deep is the Daqiang Mine of Tiefa Energy Company?

673 meters. Tiefa Energy Co., Ltd. was registered in 2009, and the former Tiemei Group became its holding subsidiary. The company is headquartered in Diaobingshan City, northern Liaoning Province. Daqiang mine of Tiefa Energy Company is 673 meters deep, and the mine is the general name of underground production system of coal mine, such as shaft, chamber, equipment, ground buildings and structures.