0 preface
Henan Jinyuan Gold Mining Co., Ltd. was founded in September 1976. It was completed and put into operation in December 1977. After several renovations and expansions, the current mining and production capacity of the mine is 3000t/d, and the annual mining volume is 1.55 million tons. The mining capacity of the plant is 1.28 million tons; the main mining objects are J4 and J5 breccia bodies, and the J5 breccia body is filled with large-diameter deep-hole rafts. The mining range is 340-400 m in the middle section, and the section height is 60 m. The room is 20m wide and 40~50m long.
Brief introduction of 1 large diameter deep hole helium filling mining
The large-diameter deep-hole post-filling mining method is shown in Figure 1, and its structural parameters are as follows.
(1) Stope parameter structure. The vertical ore body of the stope is arranged, the width of the stope is 20m, the length is the thickness of the ore body, the height of the middle section is 60m, and the top column is 8m.
(2) Acquisition and cutting. The rock drilling chamber communication roadway and the rock drilling chamber are arranged at the top of the stope, and 8m top column is left between the upper and middle section transportation roadway, and the rock drilling chamber communication roadway is connected with the upper middle section transportation roadway through the slope road. In the contact roadway, the vertical rock body is drilled into the rock drilling chamber every 4m. The size of the rock drilling chamber is 4m×3.5m, and the column between the chambers is 2m.
Application of 2 large diameter deep hole helium filling mining method
2.1 Overview of the test site
J5-340-2(1) The test stop adopts a large-diameter deep-hole one-step recovery, and the vertical ore body of the stope is arranged in a direction of 20m wide and the length of the ore body is 60m. The bottom structure of 340m consists of the mining road, the trench and the cutting cross. The upper part of the upper 400m is a rock drilling chamber with a width of 4 to 6.5m and a height of 4m. The T-150 drilling rig is used to construct the vertical parallel hole. The height of the bottom is 15m, the height of the mining is 45m, and the size of the cutting patio is 2m×2m.
According to the "Golden 3000t/d Feasibility Study Report", the J5 breccia body is one of the main ore-bearing geological bodies currently mined in the mining area, with an elevation of 670m and a basic clearance of 460m above the middle section. The ore body is 11 to 85 m thick, 80 to 190 m long, and 4 to 5 m thick. The ore body tends to be 350° with an inclination of 18° to 20°. Of Ore Deposit stratoid, average grade of about 2.8g / t, mainly pyrite altered to agglomerate mineralization, high pyrite content, mineral, rock unclear boundaries.
The ore body in the breccia between the area is consistent with the surrounding rock lithology, and the boundary of the rock is unclear. The ore body and surrounding rock are mainly composed of breccia and cement. The breccia has a high degree of cementation. The cement is mainly mineralized and hydrothermal sediment, and has different degrees of alteration. The ore rock is dense and hard, and the stability is stable. It is better, the late fracture is not developed, and when the tunnel is being excavated, there is generally no need for support.
2.2 Rock drilling and blasting
2.2.1 Rock drilling
The T150 deep hole drilling rig was used to construct large-diameter deep holes with a hole diameter of 120 mm. The hole was drilled by orthogonal test method. The hole bottom distance was 3, 4, 5 m and the row spacing was 2, 2.2, 3 m.
2.2.2 Charge
The charge per metre of the blasthole: q=π×r2×lÃ—Ï The charge density is 0.734g/cm3, and the charge per metre of the hole is 8.3kg/m according to the formula. Before loading the medicine, the ore above the blasthole should be removed and checked for water and blockage. If there is water and blockage, it should be treated in time. The charge structure is divided into the following two cases.
(1) Penetrating blastholes. First, use 10# wire to bind the blast hole to block the head, and put it into the blast hole design position (45m inside the hole), then fix the wire to the hole with wood strip or steel bar. Put 2m long sand, then put 2 bags of explosives into the hole, put 2 rounds of the same stage detonating tube detonator, then charge the hole, charge to 3m away from the orifice to stop the charge, then fill the gun with sand Hole, as shown in Figure 2.
(2) Unpenetrated blastholes. Put 2m long sand into the hole, then put 2 bags of explosive into the hole, put 2 rounds of the same-stage detonating tube detonator, charge the drug to the hole 3m to stop the charge, and then fill the hole with sand. The hole charge is a full-hole charge, as shown in Figure 3.
2.2.3 Mining and blasting
The mining blasting adopts the lateral collapse process, and each time a row of blastholes is blasted, the same row segmentation is used for millisecond blasting. The main process is as follows: the cutting cross-section and the cutting well are arranged at the end of the stope, the cutting trough is divided into upper and lower parts respectively, and the upper large-diameter cutting trough is formed by parallel large-diameter deep-hole segmental lateral blasting, and the lower part is formed. The bottoming groove is formed by blasting in the upper parallel parallel hole arranged in the cutting cross-section, first forming the bottom cutting groove, then using the medium-deep hole to pull the bottom, the spacing is 1.4m, and the hole bottom distance is 2 .1m, using the bottom of the hole to detonate, after the bottom is completed, the upper large diameter deep hole pulling groove is carried out, and then the lateral collapse is carried out for formal recovery. The caving ore is discharged from the loading and unloading road by using a 2m3 diesel scraper. The ore is poured into the ore and then transported in a centralized manner. Fill it after the recovery.
2.3 mining
The caving ore is mined from the ore loading channel by a 2m3 diesel scraper, and the ore is poured into the ore chute and then transported in a centralized manner.
2.4 filling
After the mining of the stope is completed, the concrete passages of the goaf are closed by concrete walls, and the graded tailings are used for multiple filling.
Each filling height is 2~3m. After the filling body is cured to a certain strength, the next filling is carried out until it is connected to the top plate of the empty area.
Considering that the filling body should meet the self-supporting requirements and require a certain strength in the future, the first step of the mine has a 1:4 lime-sand ratio at the bottom of the mine, and the upper part is filled with a 1:8 lime-sand ratio. The second-step mine uses a lime-sand ratio of 1 : 15 to 1:20.
2.5 ventilation
The stope uses main airflow ventilation. Wind flow → 340m middle section roadway → mining ore roadway → mining and distribution roadway → mining site → upper middle section roadway.
2.6 Test main technical and economic indicators
According to the mining data, the main technical and economic indicators tested are:
Production capacity of ore block: 300～500t/d; number of deep hole drilling rig: 5m/table; amount of mine per meter collapse: 15.9t/m; unit consumption of explosive: 0.35kg/t; direct cost of mining operation: 34 .03 yuan / t.
The one-step stope is mined by the large-diameter stage empty field method, which has the advantages of high recovery strength, high labor productivity, low mining cost, high mechanical strength, low labor intensity, and safe recovery.
3 conclusions
Through the study of the mining method of the J5 breccia ore body of Jinyuan Gold Mine, the following conclusions are drawn:
(1) For the J5 ore body mining, the two-step large-diameter deep-hole stage empty-field post-filling mining method effectively solves the contradiction between the production capacity, the lean index and the size of the stope structure, and achieves efficient and safe mining. During the industrial test, the production capacity of the stope was stable at 450t/d, and good economic and technical indicators were obtained.
(2) The sulcus structure of the bottom side of the unilateral ore is adopted to meet the mining and mining requirements. At the same time, the spray anchor net is used for the loading and unloading and the bottom hole of the middle and deep hole is used for the bottoming, which plays a very important role in the loading and unloading. Good protection, avoiding the damage of the deep-hole blasting to the loading route.
references:
[1] Xue Yuzhong. High Large Diameter hole stope subsequent filling Method in Anqing Copper Mine [J]. China Mine Engineering, 2008 (02).
[2] Li Qiang, Long Jia'an, Sheng Jia. Optimization of large diameter deep hole rock blasting parameters [J]. Mining Technology, 2012, 12(5): 71-72, 87.
[3] Zou Xianji. Study on the collapse mode of large diameter deep hole mining method [J]. Nonferrous Metals, 2005 (4).
[4] Chen Yunxiang, Zhang Jirong, Li Yuncao, et al. Large-diameter deep hole blasting of hard rock and large block rate control technology [J]. Mineral Research and Development, 2014, 34(4): 115-118, 127.
    Source: Mining Technology: 2016.16(1);
    Copyright:
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