A multi-metal ore mining joint venture, available resources amount to 9,831,400 t, using the first open-pit mining of underground way, an open-pit mining project put into operation in early 2015, the production scale of 3000t / d, production The service period is about 4a; the second phase considers the mining depletion and loss, the total mining volume is 100,180,600 tons, the production service life is 12a, the first production is 396,000 t/a, and the second to the 7th are 1 million t/a, 8th to 10th is 825,000 t/a, the 11th year is 660,000 t/a, and the 12th is 487,600 t/a. According to the deposit form, engineering geology and hydrogeological conditions, combined with the surface topography and the selected mining method, referring to the measured data of similar surface rock movements, the moving angle of the lower part of the ore body and the end rock is determined by 65°, and the rock movement on the upper plate The corner is circled at 60°. The design mid-section height is 48m, with 1594, 1546, 1498, 1450, 1402, 1354, 1306, 1258m8 middle sections, and the middle of the infrastructure is 1594, 1546 and 1498m. To this end, it is necessary to carry out the design of the ground mining and transportation system. The auxiliary shaft is mainly used to upgrade personnel and also serves as an inlet and a downhole safety exit. A mine elevator and a ladder are arranged in the wellbore, and the air duct, the water supply pipe, the drain pipe and the cable are arranged in the auxiliary well. The net diameter of the wellbore is 4.0m, the height of the wellhead is 1630m, and the depth of the well is 300m. The ramp is used as a track and exit device for the transportation of waste rock, personnel, materials and auxiliary air. The length of the slope is 1969m, the section of the roadway is 4.0m×3.8m, the maximum slope is 15%, and the average slope is 3 develop transportation design The second stage of the deposit is 1546m above the middle section. The auxiliary shaft + slope is used for development. The ore is transported from the main ramp to the plant. The average underground distance is 0.8km, the surface distance is 1.4km, and the 20t underground dump is used. A total of 5 cars, 4 with 1 spare. The auxiliary shaft is arranged near the III# exploration line on the north side of the mining area. It is mainly used to upgrade personnel and also serves as an inlet and a downhole safety exit. The air supply pipe, the water supply pipe, the drain pipe and the cable are all arranged in the auxiliary well. The net diameter of the wellbore is 4.0m, the height of the wellhead is 1630m, and the depth of the well is 300m. There is a mine elevator and ladder between the wellbore, and the auxiliary well is 1546, 1498. The Donghuifeng well is arranged near the V# exploration line. The net diameter of the wellbore is 3.5m, the height of the wellhead is 1750m, the elevation of the well bottom is 1546m, and the depth of the well is 204m. The east return air well is connected to each middle section through the inverted wind shaft below 1546m. The coordinates of the main wellbore center and the mouth are shown in Table 2. 4.2 tape transport system The broken ore is directly discharged into the long belt conveyor in the pit, and transported to the wellhead of the inclined shaft and transported by the short belt conveyor to the original mine bin of the selected plant. The angle of the inclined shaft of the tape in the pit is 12.15°, part of the belt conveyor is in the pit, part is above the surface, and the ground part is set in the belt corridor. The tape conveyor sets the necessary safety protection. The technical parameters of the belt conveyor are shown in Table 3. The auxiliary shaft is mainly used to upgrade personnel and intake air, and the mine elevator and water supply, drainage and gas supply pipelines are arranged in the well. The mining elevator has a load capacity of 1t, each lift is 10 people, the lifting height is 276m, the rated speed is 1.5m/s, the car size is 1615mm×1660mm, and the motor power is 22kW. Article source: "Modern Mining", 2017.4 Author: Chen Zhixing; Xiamen Zijin Engineering Co., Ltd. Copyright: Stationery Set,Stationery Kit,Office Stationery Set,Beautiful Stationery Sets Hangzhou Aoxin Culture Technology Co., Ltd. , https://www.aoxinks.com
1 Develop a transportation system plan
According to the technical conditions of mining and mining, the location of the plant and the topography of the land, three kinds of development transportation plans are proposed.
1.1 Scheme I
Use the tape inclined shaft + auxiliary shaft + ramp to develop transportation. The inclined shaft of the tape is used to lift the ore. The middle ore is transported to the chute through the 15t underground dump truck and is lowered to the crushing station of 1359m. After the crushing, the ore is transported from the inclined shaft to the surface of the selected plant and transported to the original ore bin of the plant through short tape. The inclined length of the tape is 1285m long, the section is 4.3m×3.5m, the height of the wellhead is 1600m, the elevation of the well bottom is 1354m, the slope is 19.7%; the ST1600 tape is used, the bandwidth is 1000m, and the motor power is 2×200kW [1]; The short surface tape is 60m long and 1000mm wide, and the motor power is 22kW. The middle section is transported by JKQ-15 dump truck, and 3 is used.
13%, 300mm thick concrete is laid on the slope road surface.
1.2 Scheme II
Use the main bucket + auxiliary shaft + ramp to develop transportation. The main shaft of the bucket is used to raise the ore and is arranged in the II# to III# exploration line on the north side of the mining area. The main transport level is set at 1354m, the bucket loading level is 1329m, and the powder mine recovery level is 1289m. The middle ore is transported to the chute through the 15t underground dump truck and decentralized to the crushing station of 1359m. The crushed ore is transported from the 1354m horizontal length 220m tape to the finished mine silo, and the short shaft is used to load the bucket, and the main well is lifted to the surface, and then It is transported to the original mine bin of the plant through a 20t car. The middle section is transported by JKQ-15 type dump truck, 3 is used for 2, and the surface vehicle has a distance of 1.4km. It requires 6 sets of 20t dump trucks and 4 sets of 2 sets.
The net diameter of the main shaft is 4.0m, the height of the wellhead is 1630m, the elevation at the bottom of the well is 1289m, and the depth of the well is 341m. It adopts 6.3m3 single bucket with balance hammer lifting, and uses JKMD2.8×4( 1) E-type multi-rope friction hoist with motor power of 566kW.
The auxiliary shaft is mainly used to upgrade personnel and fine ore, and also serves as an inlet and a downhole safety exit. A mine elevator and a ladder are arranged in the wellbore, and the air duct, the water supply pipe, the drain pipe and the cable are arranged in the auxiliary well. The net diameter of the wellbore is 4.0m, the height of the wellhead is 1630m, and the depth of the well is 370m.
The ramp is used as a track and exit device for the transportation of waste rock, personnel, materials and auxiliary air. The slope length is 1969m, the section of the roadway is 4.0m×3.8m, the maximum slope is 15%, and the average slope is 13%. 300mm thick concrete is laid on the slope road surface.
1.3 Scheme III
Use ramps + auxiliary shafts to develop transportation. The middle ore is transported by car to the original ore bin of the surface selection plant through the ramp. The slope length is 2720m, the section of the roadway is 4.2m×4.0m, the maximum slope is 12%, the average slope is 10%, and the slope road surface is 300mm thick. Concrete. The 20t dump truck is used for transportation. The average underground distance is 1.5km, the average surface distance is 1.4km, and 13 dump trucks are required for the production period.
The auxiliary shaft is mainly used to upgrade personnel and also serves as an inlet and a downhole safety exit. A mine elevator and a ladder are arranged in the wellbore, and the air duct, the water supply pipe, the drain pipe and the cable are arranged in the auxiliary well. The net diameter of the wellbore is 4.0m, the height of the wellhead is 1630m, and the depth of the well is 300m.
2 program comparison
The technical and economic comparison of each program is shown in Table 1. It can be seen that the infrastructure investment of the scheme II is the largest, and the annual operating expenses are the highest. The infrastructure construction and infrastructure investment of the scheme III is small, the annual operating cost is higher, and the current value of the cost is the lowest. However, the slope road is the main transportation channel, the automobile transportation is busy, and the automobile exhaust gas is The underground air pollution is serious; the infrastructure investment of the scheme I is relatively small, and the annual operating cost is the lowest. The present value of the cost is only 3.286 million yuan more than the scheme III. Considering all aspects of the factors and combining the recommendations of the “Multi-metal ore deposit development planâ€, this design choice is I. However, the construction period of the inclined shaft and the smashing system of the tape is long. It is expected that there will be a problem with the open-pit mining in 3a. Therefore, the ore in the 2a production will be transported by the car to the surface through the slope. After the tape transportation system is completed, the tape will be transported. To the factory. 
Scheme I is used below the middle of 1546m. The bottom of the inclined shaft of the tape is located at the level of 1354m, and the crushing station is located at 1359m. The ore above the middle section of 1402m is transported by the car to the main chute through the middle section roadway. The ore below the middle section of 1402m is transported to the main chute through the ramp road to the 1402m level. After the ore is broken, it is transported by tape to the vicinity of the surface selection plant, and then transported to the original ore bin of the plant by the short belt of the surface. The waste rock is transported directly by the ramp from the ramp to the dumping site with an average transport distance of 2.7km, a downhole of 1.5km and a surface of 1.2km. The inclined shaft of the tape bears the task of transporting the ore. The mouth of the mine is located on the northwest side of the existing plant, about 60m away from the original mine. The length of the inclined shaft of the tape is 1285m, the section is 4.3m×3.5m, the elevation of the mouth is 1600m, the elevation of the bottom is 1354m, and the slope is 19.7%. The short surface of the surface is 60m long and flat.
The middle section of 1450, 1402, 1354m is connected.
The main ramp is arranged in a fold-back arrangement along the lower part of the ore body, mainly as the access and exit channels for personnel, materials and trackless equipment, and also supports the first stage of ore transportation and waste rock transportation tasks during the construction period and production period. The slope of the first phase is 862m long, the length of the second slope is 1107m, the section of the roadway is 4.0m×3.8m, the maximum slope is 15%, the average slope is 13%, and a section of 20m long gentle slope and wrong lane is arranged every 200m. For 3%, 300mm thick concrete is laid on the slope road surface.
The west return air well is arranged in the 2#～3# exploration line. The net diameter of the wellbore is 3.5m, the height of the wellhead is 1710m, the elevation of the well bottom is 1546m, the depth of the well is 164m, and the west return air well is connected with the middle section of 1594, 1546m. The west return air well is connected to each middle section through the inverted wind shaft below 1546m.
4 equipment selection
4.1 In-pit crushing system
In order to meet the requirements of the tape lifting, the ore mined at the maximum block size of 700 mm is broken to below 260 mm. The crushing station is located at the level of 1359m and serves ore in the middle of the 1402m or above. The crushing system selects one C95 type jaw crusher , the motor power is 90kW, the production capacity is 350~455t/h; one ZZF3.5×1.4-10°/5.5×2 type feeder feeds [2], a CJ1213 wet dust collector was installed next to the diverticulum to treat a large amount of dust generated by the crushing, and the motor power of the precipitator was 18.5 kW.
4.3 Auxiliary well lifting facility
5 Conclusion
In combination with the actual needs of a polymetallic mine production, three kinds of development transportation system schemes have been formulated. Through detailed technical and economic comparison, it is determined that the use of the tape inclined shaft + auxiliary shaft + slope road to develop the transportation plan is the most reasonable, and the infrastructure investment is small, comparable to the annual operation. The lowest cost. Practice has proved that after the production has been completed, the production scale has been met and good economic benefits have been achieved.
references
[1] Yu Limin, Yan Zilian. Mine fixed equipment selection manual [M]. Beijing: Coal Industry Press, 2007.
[2] Wang Yunmin. China Mining Equipment Handbook [M]. Beijing: Science Press, 2007.