UKL Bearing Manufacturing Co., Ltd., , https://www.uklautoparts.com1 When the underground mining recoverable reserves and scale are small, the service period is short, and the open pit slope is stable, the development system should be arranged in the open pit;
2 When the underground mining has large recoverable reserves, long service time, and the stability of the open pit slope is poor, the development system should be arranged outside the open space;
3 When the underground mining recoverable reserves and scale are large, and the open pit slope is stable, the main and auxiliary lifting wells should be arranged outside the open-air boundary, and the auxiliary shafts such as slopes or wind shafts can be arranged in the open pit.