Suitable for thick and extremely thick steep ore bodies with stable ore [References] 1 The stability of the surrounding rock stabilized ore body may be lower than that of the mining method, so as not to cause fragmentation and roofing. 2 The angle of inclination of the ore body shall not be less than the natural angle of repose of the ore, generally it shall be 50° or more. If necessary measures are taken, it can also be applied to inclined or gently inclined ore bodies (for example, a lower funnel can be set). ( 2 ) main advantages 1) Workers work in small section roadways, and mining work is safer. 2) The recovery intensity is relatively large. In a stope, there are more working faces. Therefore, when mining with this mining method, the stope can be relatively small. 3) The working cycle is relatively simple and the ventilation conditions are good. 4) The pit wood consumption is small and the mining cost is low.   ( 3 ) main disadvantages 1) Large amount of work is required: the ratio is 5 to 15 meters per kilometer (larger than the retention method). Under normal conditions, a stope should be used to dig 500 to 700 meters of cutting roadway. The construction often takes about half a year. time. 2) In the section roadway, it is not easy to realize the mechanization of roadway driving. Research-oriented, mechanized equipment for roadway excavation. (Gold Ridge iron ore solved this by, T4G direct access to the segment of roadway work). 3) The ore column accounts for a relatively large amount of ore, and the loss of the back to the mining column is relatively large. (The loss rate is 10-15%, even up to 20%, and the depletion rate is 10-15%) (the ore content is about 35-60%). 4) The use of medium-deep hole ore, high block rate, secondary damage, this workload is large. 5) Hand selection and mining are not possible. ( 4 ) Main technical and economic indicators 1) Production capacity of the mining block - 140 ~ 180 tons / day; 2) Rock drilling efficiency - medium to deep hole is 40 ~ 60 meters / Taiwan · class; 3) Transportation efficiency - 110-150 tons / Taiwan class; 4) Mining efficiency - 30 to 50 tons / work; 5) Depletion rate - 4 to 8%; 6) Loss rate - 10 to 15%; 7) Mining cutting capacity - 6 ~ 8 m / kg; 8) Main material consumption: 1 Explosive unit consumption - 0.1 ~ 0.3 Kg / piece 2 Detonator unit consumption - 0.2 ~ 0.3 / ton 3 fuse line consumption - 0.2 ~ 0.6 m / T 4 alloy sheet unit consumption - 0.02 ~ 0.05 g / ton 5 single cost of brazing steel - 0.02 Kg / T 6 pit wood consumption - 0.0009 ~ 0.03 m 3 / ton Electronic Red Dot Sights,Good Quality Red Dot Sights,Is Red Dot Sights Accurate,Laser Red Dot Sights Nantong Dinggo Optical Instrument Co.,Ltd , https://www.focuhunterequip.com
Evaluation of mining method in staged rock drilling stage
( 1 ) Applicable conditions: