1 The mining work organizes production with stopes as a unit, implements enhanced mining, promotes advanced experience, adopts applicable new technologies, and earnestly implements relevant safety regulations and technical operating regulations.

2 Stope design and construction must meet the mining recovery rate and mining dilution rate requirements of the mine design.

3 Each pit opening shall formulate detailed rules for the implementation of stope technical management in accordance with the prescribed basic principles and in combination with actual conditions.

4 Stope monomer design

4.1 The unit design of the stope shall be carried out based on the geological data provided by the geological survey department (including textual descriptions and drawings of ore body geology, hydrogeology, engineering geology, etc.). The geological reserves of the stope’s monomer design are required to reach level B. For complex 2V exploration type ore bodies and remote and scattered small ore bodies, the level can be lowered according to specific conditions.

The provision of geological data for design needs to be reviewed by the competent technical personnel of geological surveying. If the design requirements cannot be met, the designer can request additional production prospecting, or combined with the ore body design, supplement production prospecting projects.

4.2 The single stope design is carried out on the basis of the overall design of the stope in the middle section of Daben, taking care of the relationship between the upper, lower left and right adjacent stopes and the stoping sequence.