I. Geological overview
The deposit is a post-generation hydrothermal uranium- molybdenum sedimentary metamorphic deposit. The ore body is present in the siliceous zone. Siliceous tape length 4km, width of 50 ~ 300m, mainly by dark gray quartzite and quartz micro rocks. The shape of the ore body is complex, with irregular lens body and nest shape. The contact with the surrounding rock is not obvious, the size is different, the strike length is 20-200m, the inclination angle is 70°-90°, the ore is uneven, and the grade changes greatly. The ore is hard and stable. The upper plate of ƒ=16～180 is silicified carbonaceous shale or carbonaceous shale, and the lower plate is quartzite ƒ=17～19, and the fissure is developed. Inflow normally 3600m 3 / h, the sudden gushing a face up 4900m 3 / h, temperature 38 ° ~ 50 ℃, up to 58 ℃.
Second, mining methods
Mainly use horizontal layer filling method. The stage height is 40 to 50 m. The mine filling method has the following characteristics:
(1) Concrete artificial columns. When the thickness of the ore body is greater than 10m, the ore and pillars are arranged along the direction of the ore body. The mine is 15 to 20 m wide and the pillar is 2 to 6 m wide. First, the mining column is used to cast the goaf with low-grade concrete to form an artificial column. Figure 1.
Figure 1 Horizontal stratified filling method for concrete columns
1—concrete column; 2—mine house; 3—filling well; 4—filling small well; 5—contact road; 6—electric ramp; 7—concrete false alley;
8—returning roadway; 9—shunting patio; 10—concrete slab; 11—intra-pulse transportation lane; 12—pulse transportation lane
The formation of the artificial column can be back to the mining column by horizontal layered cement filling method. The width of the pillar is 6m. After each layer, the coarse aggregate waste rock (50~200mm) is filled, and each filling is 0.6m, and the cement mortar is used for consolidation and filling. Material, can also be used to retain the mining method plus the mining column, followed by a cementation filling. The pillar width can be reduced to 2m. When filling with coarse aggregate, the waste rock is transported to the mixing station by the mine car and added with the appropriate amount of cement mortar, which is then transported to the stope for filling. Mortar ratio, water: cement: sand = 0.9: 1: 3 ~ 3.25 (by weight). When filling with fine aggregate (20-40mm), the concrete is prepared at the mixing station and sent to the stope through the pipeline with compressed air. The water-cement ratio is 0.7:0.8, and the ratio (weight) of cement sand: gravel = 1:3.5:6.
(2) Concrete barrier wall. as shown in picture 2. A mine house is arranged every 20 to 40 m along the direction of the ore body, and the pillar is cancelled. The mining of adjacent mines is delayed by 4~8m. With the recovery of the lead stop, a 0.8m thick concrete barrier wall was poured in time. The height of the mining is 2~3.5m, the hand-held rock drill is rock-socketed, and the blasting is carried out with 28kW electric pick-up and filling. Each layer is filled with waste rock, and 80-100 mm plates are laid on the bottom plate to reduce the loss of depletion.
Figure 2 Concrete wall filling method
1—slipper pedestrian well; 2—filling well; 3—concrete wall; 4—false bottom
This method is more than the mining and inter-column two-step mining, the mining intensity is increased by 79%, the work efficiency is increased by 73%, the consumption of ton of ore concrete is only 0.012m 3 , and the direct cost is reduced by 10%.
(3) Concrete false bottoms. Cut all the bottom of the ore body from the transportation roadway, pour the concrete floor space of 0.4-0.8m thick, erect the template according to the design, build the concrete false alley and funnel of 0.3-0.5m thick, and then fill the waste stone to the top of the false alley. Above 1m, recast 150mm mortar pad.
Third, fill the watering system. A filling well is arranged every 100m along the strike direction, and the upper quarry is used to penetrate the ground quarry from the top blasting to form a silo connected with the filling well. The quarry and the waste rock from the well are poured into the storage silo. The tailings and off-balance ore of the radioactive plant are poured into the underground heap leaching field, and the heap is immersed for filling. As shown in Figure 3.
Figure 3 filling system
1—fine sand chute; 2—quarry; 3—filling storage silo; 4—filling well; 5—filling electric raft;
6—concrete mixing station; 7—filling pipeline; 8—downhole heap leaching field; 9-mining yard
The lower middle section is connected with the main filling well by a branching patio. Most of the filling is filled directly into the stope, and the filling speed is fast and the buffering space is large.
Full three ore concrete mixing station, on a surface, a downhole pressure conveying gas to concrete or mortar filled stope by 150mm cast iron pipe. The mixing station equipment has a JI-800 concrete mixer, capacity 800L, motor 17kW, productivity 90-120 seconds/time, ZH05 (500/150) concrete pouring machine, capacity 500L, aggregate maximum allowable particle size 50mm The horizontal conveying distance is up to 250m.
(4) The main technical and economic indicators are listed in Table 1.
Table 1 Main technical and economic indicators of 711 mine horizontal stratified filling mining method
Indicator name | unit | Quantity | Indicator name | unit | Quantity |
range | average | range | average |
Stop production capacity Filling production capacity Mining intensity Mining efficiency Filling work efficiency Depletion rate Loss rate | t/d M 3 / sets of classes Tons / m February Tons / work class M 3 / working class % % | 50~60 25～110 3 to 4.5 2 to 3.8 3~12 15~23 2-8 | 55 67.5 3.75 2.9 7 10 5 | Main material consumption Explosive Detonator Brazed head Brazing steel Wood Cement | Kg/kt / thousand tons / thousand tons Kg/kt m 3 /kt t/kt | 650～750 680~1100 170～230 130-170 1.5 to 3.1 6.3~15 | 650 890 200 150 2.3 10.7 |
Cost | | Quantity | % | Cost | | Quantity | % |
material wage power direct cost | Yuan / ton Yuan / ton Yuan / ton Yuan / ton | 13.30 10.00 10.00 33.30 | twenty one 15.5 15.5 51.6 | Shipping fee Workshop funding Enterprise management fee Mine cost | Yuan / ton Yuan / ton Yuan / ton Yuan / ton | 1.60 20.00 9.60 64.50 | 2.3 3.1 14.7 100 |
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