Laos, climb Ben Gold ore mining infrastructure is currently undergoing preliminary work, roadway construction is one of the key points. In order to achieve the overall goal of mine trial production, and ensure that the climb to the gold mine to complete the construction work on time and in good quality, the construction progress of the roadway project must be accelerated. There are two main development plans for the V-1# rock gold ore body: the development plan of the Quanpingyi shaft and the joint development plan for the auxiliary inclined shaft and the flat road. In order to achieve the total investment in controlling the mine construction and speed up the construction progress of the mine, it is necessary to The two schemes are compared and selected for implementation.
1 Mine geological overview
The Chongben mining area is located in the southward extension of the “Sanjiang†(Nujiang, Minjiang, and Jinshajiang) metallogenic belts in Yunnan. In the geotectonic position, it is located in the Mesozoic depression belt (II) and Lubrella in Funchal-Papa (Thailand). The junction of the Hualixi fold belt (III) in Bangli (Thailand) is very favorable in the vicinity of the Lubrellabang fault zone (F2). The genetic type of the gold ore body in the mining area is a magmatic hydrothermal gold deposit. The ore bodies are all present in the Permian limestone, controlled by a group of north-south-west and south-western tectonic belts [1]. In the detailed investigation report, a total of 6 rock gold ore bodies (II-1#, II-2#, II-4#, II-5#, III-1#, V-1#) participating in the reserve estimation were identified. 11 gold ore bodies (H1 ~ H11).
At present, the mining design is mainly for the V-1# gold ore body. The ore body is located on the 9th to 16th lines. It is the largest ore body in this area. It is a carbonate-bearing fine veined rock with a westward slope. Shape. The ore body is controlled by 2 shallow pits and 5 trenches on the surface, the shallow part is controlled by 3 tunnels in 2 middle sections, and the deep part is controlled by 25 drill holes. The control length is 650m, the maximum extension depth is 350m, the average control depth is 234m, and the occurrence is 255°~270°∠40°～55°. The ore body goes to the surface (about 930m) 355°~0°, and the 800m elevation is 350°. The 700m elevation is 345°. The top-down trend shifted from near north to south and the northwest did not change significantly. The ore body is on the southwest side, the north side of the side angle is 20°, and the south section is 30°. At present, the control ore body has an elevation of 650-940m, which is thinner in the north and thicker in the north. The thickness of single projecting is generally 1.1~6.87m, the thickest is 10.42m (ZK9-2 hole), and the average true thickness is about 3.36m. The thickest is 9.87m and the thickness variation coefficient is 86.17%.
The average gold grade of a single project is generally (2.32~8.12)×10-6, the average gold grade is 6.28×10-6, the highest grade is 157.0×10-6, and the gold grade variation coefficient is 106. .2%.
2 mine development plan
2.1 Mine development status
The mine is a new mine. At present, there is a prospecting well (81-807m) located in the 8# exploration line. The inclined well has opened more than 150m (including along the vein and the vein) in the middle section of the 807m, inclined well. The section is 2m×2.2m and the inclination angle is 23°. In addition to the partial use of wooden support in the wellbore, other parts of the rock have good stability; there is also a prospecting flat (886.738m) located near the 4 exploration line. The middle section of the 887m has been opened more than 300m (including along the vein and the vein), and the section of the inclined shaft is 2m×2.2m. The stability of the flat rock is good.
2.2 Quanping rafting development plan
Pingyi development system: the main level is 687m and the length is 1200m. The middle ore and waste rock are discharged to the middle of 687m through the chute. The ore is transported by ZK7-6/250 electric motor vehicle to the YFC1.2(6) type. The original ore bin of the plant was selected, and the waste rock was excavated in the upper middle section for filling the lower middle section. In the middle of the 887m, there is an exit on the surface of the Pingyi, and the main plaques of the 737 and 687m are newly opened, and an ore is located in the middle of the 787-687m. All the mines and rocks in the middle of the mine are transported by the ZK7-3/250 electric motor vehicle to the YFC0.7 (6) type inverted mine car, and the ore is discharged to the middle ore. Personnel and materials pass through the flat mouths to the middle sections of the well. After the middle of the 687 and 737m mining, the middle section of the 837~887m ventilation adopts the central diagonal extraction ventilation system of 837m flat wind inlet and 88778m middle section return air, and the 887m flat blower is placed in the vicinity of the 887m flat rake, the air volume And negative pressure can meet the ventilation requirements. According to the conditions of the ore body and the mining method selected, the design determines the height of the middle section to be 50m, which is divided into the middle section of 887, 837, 787, 737, 687m from top to bottom.
Sliding well project: design one ore chute, with a height of 687 ~ 787m and a length of 100m. The normal section of the chute is 2.5m in diameter, and the diameter of the storage section is 3.5m and the height is 18m. Supported by steel fiber, the support thickness is 300mm. In each middle section, a 3t electric motor vehicle is used to transport ore and waste rock to the slipping yard, and the ore is discharged to the middle of the 687m main section. In each middle section, there is a dumping chamber connected to the chute, and the loading chamber is set at 687m main transport flat.
2.3 Auxiliary inclined shaft and flat joint development plan
The main section of the main transport 687m is still submitted by the Changchun Gold Design Institute, and a flat section is arranged in the middle section of the 887m. The ore in the middle section and the remaining waste rock are transported to the stage chute through the electric motor vehicle and the mine car. They are discharged to the middle section of the main transport by 687m and then transported to the original mine silo and the surface waste rock yard.
The auxiliary inclined shaft design is mainly used to upgrade personnel and materials, serving the middle section of 737 ~ 837m. The elevation of the auxiliary inclined wellhead is +884m, the elevation of the inclined well is +728m, the vertical depth is 156m, the inclination is 23°, and the inclined length is 400m. Through calculation and calculation, choose JTP-1.6 hoist and 20mm6×19+FC wire rope. With a single hook lift, two XRC10-6/6 type inclined well trucks transport the workers up and down the inclined shaft. The first car has a weight of 1550kg, the tail car has a weight of 1537kg, and the nominal load of the car is 1600kg. Each time it is limited to 20 people, the maximum pull force of the connector is 58.86kN, and the annual working time of the mine is 330d. The mining substation and the air compressor room are arranged near the entrance of the inclined shaft. The middle section of the first mining is the middle section of +737 and +787m.
3 program comparison
3.1 The amount of infrastructure construction
According to the preliminary design report, the basic construction content of the Quanpingjing slipping scheme is 687, 737, 787m middle section development project, slip well project, prospecting project, mining and cutting project, etc. The amount of infrastructure construction is 39579m3, of which the opening project is 34579m3 and the prospecting project is 2000m3. The cutting project is 3000m3.
The main level of the main leveling and auxiliary inclined shaft schemes is 687, 737, 787m middle section, auxiliary inclined wells, slipping engineering, prospecting engineering, mining and cutting engineering, etc. The amount of infrastructure construction is 35,740 m3, of which the development project is 30,340 m3 and the prospecting project is 2,400 m3. The mining and cutting project is 3000m3, which is 9.7% less than the full flat.
3.2 Investment estimate
According to the preliminary design report, the total cost of the main infrastructure roadway project of the Quanpingyi slipway project is estimated to be 29.17 million yuan. The main construction cost of the main infrastructure and auxiliary roadway project is estimated to be 26.97 million yuan, which is 2.2 million yuan, which is about 7.5% of the Pingyi slipping plan. The specific project cost is shown in Table 1.
3.3 Infrastructure construction period
According to the existing technical equipment level, construction efficiency and roadway section size of the mine construction team, the construction team can complete the patio or chute 70m per month, complete the 120-150m flat road every month, and complete the diverting room excavation 500m3 per month, or complete 110m inclined shaft development. According to the calculation of the bill of quantities in Table 1, the construction period of the main shaft roadway of the Quanpingjing slipway scheme is 18 months. The joint construction period of the main tunnel and the auxiliary inclined shaft is 14 months, and the construction period is shortened by 4 months. month.
4 Conclusion
In summary, for the two development plans of the Quanping raft and the main raft and the auxiliary inclined well, the latter is 9.7% less than the former by the engineering quantity, investment estimate and construction time from the infrastructure period. The project cost savings are 9.4%, and the total construction period is shortened by 4 months. Therefore, the main flat and auxiliary inclined well solutions are better, which is more suitable for the development of Laos climbing gold mine.
Article source: "Modern Mining"; 2017.2
Author: Shen Kyushu; Tianjin North China Geological Exploration Bureau
Wang Yaming; North China Nonferrous Engineering Investigation Institute Co., Ltd.
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