New process for mining gently inclined thin ore body in Fankou Mine

0 preface

Fankou lead zinc mine expansion since the 180 000 t, stope stope quickly reduced, especially Heavy's main ore mining has been almost completed, the current stope is generally small, and mostly between columns, roof-pillar mining In the field and corner ore body, the mining safety of the stope has become more and more difficult, and the 209a, 210a ore body is the main main mining body of the mine. The main shape is the gently inclined thin ore body, which has been adopted in the past. Artificial and large trolleys are harvested. During the mining process, the surrounding rock delamination occurs frequently. When mining, the surrounding rock support requirements are high, the recovery efficiency is low, and the mining risk is high. Exploring and practicing, and with the advantages of the introduction of foreign advanced equipment small trolleys and visual remote-controlled scrapers, it has successfully used small-vehicle fan-shaped side collapse and VCR large-blast oblique hole lateral collapse, and cooperated with the use of visual remote control The mining of the aircraft has completely changed the original inefficient and backward mining technology. The new mining technology can not only ensure the safety of mining, but also improve the recovery efficiency. At present, the new mining technology has been extracted in the inclined ore body of Fankou Mine. Wide range use.
1 mining technical conditions
The Fankou lead-zinc deposit belongs to the sedimentary-hydrothermal reformed layer-controlled lead-zinc deposit. The ore body is present in the Devonian system of the Middle, Upper and Lithose limestone series. The ore body is complex in shape and the average thickness of the ore body is 20 ~ 50m, the last up to 100m, the inclination is generally 60 ° ~ 70 °, the local is 14 ° ~ 20 °. The main useful minerals galena, pyrite and sphalerite. The ore has good stability, f=8～13; the upper and lower plates of the ore body are limestone, which is moderately stable, a small part is limestone and sandy rock, f=4～6, it is easy to fall and encounter cement, and the stability is poor. . The ore has a high sulfur content and is prone to agglomeration and fever.
Sh209a, Sh210a ore bodies are widely distributed in the upper and lower parts. The upper ore body mainly exists in the D2db stratum. The ore body is layered and strip-like, mainly composed of massive yellow iron lead-zinc ore. The ore body has a length of about 620m and a thickness of 0.50~17m. The main mining area. The deep ore body is distributed in the D2db stratum, which is a gentle to moderately inclined layered output. The ore body has a length of 1350m, a dip angle of 25° to 53°, generally 45°, a thickness of 4 to 38 m, and a maximum thickness of 46 m, with an average of 13.14 m. . The stratum is clear, the interbed structure and fissures develop, and the inclination is 35°～60°, the inclination angle is 30°～73°, and the delamination is easy to fall off.
2 mining process
According to the thickness and inclination of the ore body, different mining methods can be selected, which are generally divided into two types: mining along the ore body and vertical ore body mining. The current Shilingnan 209a, 210a ore body adopts strip mining, and the deep is basically vertical. In the mining, there are also a small number of independent ore bodies along the strip, and the strips are used to recover the side of the small-vehicle fan-shaped hole. The vertical direction of the mining uses the VCR large-blast blasthole.
2.1 Small trolley fan-shaped hole side collapse process
The process is based on the panel filling method. On each segment, the approach is designed to reach the position of the ore body. From one section along the ore body to the bottom, a patio is placed at the other end of the stope. Ventilation and filling in the mining process of the stope; after the construction of the bottoming tunnel and the patio is completed, the mining site is cut and cut, and the small-vehicle trolley is used to retreat the fan-shaped hole, and then the charging trolley is used to charge the stophole. And use the electronic detonator to detonate, and then use the remote-controlled scraper to shovel. If there is a large piece in the process of shovel mining, use the remote-controlled crusher to crush the ore. After the shovel is finished, fill the stope. After the filling is completed, the construction is uphill. The approach is to use a bristle car to treat the stope with a lint, and then proceed to the next recovery section until the ore body is harvested to the middle of the broken roof.
Stope structure parameters: the length of the stope is the length of the ore body. If the ore body is too long, it can be divided and harvested. The width: the width of the bottoming lane is 3.2m, the width after cutting is generally 5.0m, and the width of the stop is 8.0m, if the local ore body is super wide, leave the security pillar together with eye blasting and recovery, the stratified recovery height is generally controlled within 8.5m, and the small trolley usually has 4 to 6 shots (0.9m per rod) ), the inclined hole construction angle is adjusted according to the inclination of the ore body, and the small-vehicle fan-shaped hole side collapse process is shown in Fig. 1.

The advantage of this mining process is that the degree of mechanization is high. Almost all operations are mechanized, and the recovery efficiency of the stope is very high. Second, the mining is safe. Before the blasting, the exposed space of the stope is small. When the aircraft is shoveled, the personnel do not enter the dangerous area. The operating environment of the operators is safer in all operations. The disadvantage is that in some mining sites with complicated ash structure, the depletion is large, and the waste rock is difficult to separate after blasting.
2.2VCR large blasting inclined hole lateral collapse process

The mining method is based on the panel filling method, based on the distribution of the ore body, the upper and lower chambers are arranged, and the lower chamber is first constructed. After the bottoming is completed, the lower chamber is cut to two control lines. The pavement patio is constructed for the ventilation of the stope, the free surface of the trough and the filling, and then the upper diverticulum is constructed, and the upper diverticulum is supported by the anchor net. The poorly constructed stope also needs to use the wire rope joint support. Then use the shallow hole drilling machine in the upper chamber to drill the deep hole to the lower chamber, then manually hoist the spherical drug packet to control the blasting in several stages, first pull the groove and then collapse, until the blasting of the stop is completed, and use the remote control shovel after each blasting. If the machine is shoveled, if there is a large piece in the process of shovel mining, the remote crusher will be used to crush the ore. After the shovel is finished, the stope will be filled.
Stope structure parameters: The length of the stope is determined according to the blasting range of the ore body, the width is 8.0m, the mining height is generally 25~30m, the lower chamber construction height is 3.0m, and the upper chamber construction height is 3.6m. The stope is arranged with 4 rows of blastholes, the side row distance control line is 1.2m, the row distance is 1.8~2.0m, the column distance is 2.2m, and the hole network parameter is (1.8~2.0) m×2. .2m, the hole diameter of the hole is Φ110mm, and the side collapse process is shown in Figure 2.

The advantages of the mining method are low labor intensity and high mechanized recovery efficiency. Secondly, the working environment of the personnel is relatively safe. After each blasting, the remote-controlled scraper is used to shovel the mine, and the personnel do not enter the dangerous area. The shortcoming is that after the blasting, the exposure space of the stope is large, the slip surface of the waste rock on the upper plate is slow, and it is easy to cause delamination and fall. Second, the waste rock falling from the stope or the two side filling bodies are difficult to be separated into the mine, resulting in The depletion is greater.

3 Conclusion

After many years of mining practice, Fankou Mine combines the current production conditions of the Fankou Mine and the technical conditions of the mining body. It is safe and efficient to use the above two kinds of stope processes for the mining of the gently inclined ore body of Fankou Mine. The mining-like process will cause some depletion, but it is effectively controlled by using the mining and separating and using the bright blasting technology on the upper scrap rock surface and the two-package filling body, so that the depletion of the stope is effectively controlled. The gently inclined ore mining process will become the main mining method for Fankou Mine.
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