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Jinling Iron open pit to underground mining experience

Started (building 3 to 5 years, to cover production capacity of 2 to 3 years), and even further ahead of that. This time interspersed among the open-air service life. At the same time to wait for the end of open pit mining. To try to make mine to reach production capacity. For Jinling Iron Mountain Iron Mine Underground Project start earlier. Rock because of moisture rich deposits on the plate, digging underground roadway projects ahead of schedule, was not only solve the problem of open-pit mining of the Rose thousand. But also the need for underground mining and later combined. Sixth, open flood water drainage Iron Mountain underground mine open a larger amount of water underground barrel. When the mining cut to the 35m level (underground water table elevation). Shot hole because the water, seriously affecting the blast effect, after the open pit water blasting, the equipment efficiency and greatly reduced loading shovel. However, due to open pit mining destroy transport routes. New level expansion and a variety of blasting operations. Fork can not be open pit drainage. Therefore, in order to improve the outdoor working conditions. Ensure that the open pit production capacity, proposed and implemented using the open approach to flood mine dewatering. In the open-pit mining at the same time, has opened up a 47m 7m and a large Lane, water storage, pumping stations and so on. Use of underground roadway design and layout of the open end of sulfur thousand works. Of which: the level of the construction of a 23 7m sulfur dry slightly Kui, 96 {ten escape hole 26 for a 47m construction of a dry little wife, Wei, 120 drainage holes. Underground snapped distance 40 ~ 60m, wife of personal gain every ten Bo escape hole 4 to 5. Into a plexiform arrangement. Fed up the ramp one by one wall of the two box design and beetles small-minded r l992 Mountain No. 3 where the elevation l8. -20, The two nearly horizontal holes elevation 2. , 3. Five holes in the middle of ten four-hole elevation ll. Upward holes. Drainage holes in the Ordovician limestone and generally vertical direction. Reveal the depth of limestone ● 0 ~ 80m. In addition. Mine LII also built a good time over the open flood control ditch closed circle, so that surface runoff does not flow into the open pit. Mine to reduce the seasonal displacement. Platform in the open pit cleaning gutters drain well, will be directed to determine the channel the water into the water compartment. At the same time interlinked with the open pit water gate roadway li ¨ home production that: a 47 \Meet the stripping and excavation works on reducing water table requirements, a better solution to the open pit sulfur dry and endorse for groundwater problems. Conclusion Jinling Iron Iron Mountain open pit to underground mining exploration and practical experience, similar to mine for reference. Inadequate, please peer correction. ... ... ●''・ '● ・ - ●' ... ... a ... ● ... - ● ... together a 15m open pit mining mountain stage research through the identification of 1990-1991. Qidashan Iron with East-it-T-College, Qingdao University of metallurgical and mining, mining design institute in the saddle thing fI r Qidashan medium-sized mining operation using existing equipment. Mining step will be increased to 12m 16m. Industrial test of the question with 'ISR teeth dry drill hole, {m | l loading electric bamboo mat, tons of electric wheel dump truck mounted equipment such as towel-type mining ore mining firm. I wear persons harvesting the total amount of r-Rock] 520 000 t of ore which {80000 t, rocks 10,1 million t. After two years of field and laboratory testing to determine child exploitation 15m sound level manager who I participate in casual wear t-rock 8 × 6m, r stone 7 × 6m; concept through the use of high speed photography {gifts, experimental child model who broke and now I vehicles, industrial blasting confirmed that hole filling a high degree of super pay attention and do not increase with the step height ratio fell from increasing too. That if the amount of hole and filling the ultrasonic height remains the same, delete the corresponding increase in height of the effective charge, and thus obtain a good education Tiao blasting. Improve the utilization of r hole. At the same time. Step by I5m mining. May eventually help increase the slope angle. Within the realm of rock to reduce the amount of stripping. And improve the level Slope Angle. Stripping peak of the delay, balanced production stripping ratio of great significance. As in the test study. Blasting with slag, the bottom of the interval of charge, blasting the control number of rows each time, I adjust the row of holes Taiwan reasonable charge volume, bulk mining f 『a comprehensive bench blasting Yan Basking measures to make mining the rock pile 15m height of the steps keep] Sm below the base character sets complete the Ministry of Metallurgy of the security barrier requirements. Blasting costs above measures only annual savings of 7.166 million yuan. Explosives expert from the Ministry of Metallurgy, professors of the identification of homes that the research is successful, the level reached triple into the country level - proposed mine in the application of appropriate conditions. On the key study results prove pocket Qi installed equipment in the mines under the existing mining Ll5 an R rotary drill, m 'shovel - the original design of 12m height of the step up to 15m, in Zhu technically feasible and economically beneficial significantly scattered. ~ ... ~ ... ... '((Qidashan Iron Sun Xiuhua Mao Guorui)
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