The pit mining hills are generally developed by vertical shafts, while the shallow surface minerals are jointly developed by Pingshuo-inclined wells. The method adopted is mainly for the mining and mining method, accounting for 60%, followed by the filling method, the caving method, the segmentation empty field method and the comprehensive method mining. Due to the shallow hole retention method in China, the ore loss rate and the depletion rate are as high as 16% to 35%, while the foreign high-grade vein-like or thin-layered silver ore is mainly filled by filling method, and the ore loss The rate and the rate of depletion are much lower. At present, Shandong Shilibao Silver Mine has changed the shallow hole retention method to dry filling method, and at the same time adopts mining technology such as belt bottoming, so that the loss rate and depletion rate of silver mine are from 19.65% and 31.3. %, reduced to 6.09% and 16.44%.
In terms of tunneling technology, although mechanization is basically achieved, the level is low. At present, the vertical shaft excavation is still based on the traditional hand-held rock drill, the grabbing of the rock grab, and the lifting of the slag by ordinary or lifting buckets. In terms of technical support, wood and concrete support current share is still large, bolt support only in some mines using new technology, widely used abroad anchor sprayed metal net plus China has not yet adopted.
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