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The depth, blasting area and blasting amount of the medium-deep hole are relatively large. It is necessary to ensure the safety and reliability of the operation from both drilling and blasting, ensuring a large amount of collapse per metre of blastholes, small chunks, ore loss and depletion rate. low. Therefore, it must be scientifically designed before excavation, and the drawings should accurately explain the rock drilling center of each row of holes, the serial number, depth, azimuth or inclination of each hole and construction requirements, as shown in Figure 1. The inspection is then approved by the surveyor. If the hole depth error is less than 1 m, the inclination error is less than 2 ° ~ 3 ° is basically qualified. In addition, during the drilling process, the rock driller should be based on experience and relevant knowledge.
Figure 1 Fan hole design legend