Multilayer limestone ore body mining method

Abstract

The invention relates to a multilayer limestone ore body mining method. The method comprises the following steps: (1) according to physical properties of to-be-mined limestone ore, using blasting lumpiness analysis software to select the needed drilling aperture and blasting mesh parameters; (2) adopting a bottom sandwich layer one-step blasting method, controlling the inclination of the ore bodyin different areas, controlling a perforation depth, ensuring that the bottom rock layer is perforated, wherein after the blasting, the sandwich layer is small in deformation, and no splashing is produced; (3) determining a mining and stripping method: (1) according to the drilling data and an exposed ore body, if the ore body is arched in a certain direction, combining the topographical featuresof the orientation, advancing steps towards the direction; according to the topography of one mined region, selecting the southern part of the region as a furrowed position of each step section; and (2) successively transversely arranging blasting areas which are longitudinally limited for 25 meters until reaching the edge of the step. By adopting the multilayer limestone ore body mining method, the waste stone mixing rate can be decreased, the ore mining is facilitated, and the ore recovery rate is increased.

Description

technical field [0001] The invention belongs to the field of ore mining, and in particular relates to a mining method for a multi-layered limestone ore body. Background technique [0002] In the initial stage of limestone mining, the perforation and blasting parameters were selected entirely based on experience and could not be optimized according to the actual conditions on site, resulting in poor blasting effect, with an average large block rate (greater than 80cm) of 7%; the unit consumption of explosives was relatively high, generally at 1630 kg / Tons of fluctuations. The advance of each level is controlled according to the design elevation. Since the gentle inclination angle of the ore body is not considered, the problems of ore loss and waste rock mixing will be caused during the stripping process. Contents of the invention [0003] The object of the present invention is to provide a kind of multilayer limestone ore body mining method. The invention can reduce the...

AI Technical Summary

Problems solved by technology

[0002] In the initial stage of limestone mining, the perforation and blasting parameters were selected entirely based on experience and could not be optimized according to the actual conditions on site, resulting in poor blasting effect, with an average large block rate (greater than 80cm) of 7%; the unit consumption of explosives is relatively high, generally at 1630 kg / 10,000 tons fluctuation

Each level is controlled according to the design elevation. Since the gentle inclination angle of the ore body is not considered, the problem of ore loss and waste rock mixing will be caused during the stripping process.