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Gold Science and Technology ›› 2019, Vol. 27 ›› Issue (5): 704-711.doi: 10.11872/j.issn.1005-2518.2019.05.704

• Mining Technology and Mine Management • Previous Articles     Next Articles

Continuous Dry Filling of Long Room Method for Steeply Inclined and Medium Thick Orebody

Tianhang ZHANG1(),Xingdong ZHAO2(),Huaibin LI2,Yifan ZHAO2,Shujing ZHANG2   

  1. 1. Qinglonggou Gold Mine，Qinghai Dachaidan Mining Co. ，Ltd. ，Haixi 817000，Qinghai，China
    2. Center for Shaft & Roadway and Ground Control，Northeastern University，Shenyang 110819，Liaoning，China
  • Received:2018-08-18 Revised:2019-01-03 Online:2019-10-31 Published:2019-11-07
  • Contact: Xingdong ZHAO E-mail:Tony.Zhang@ytr.net.cn;zhaoxingdong@mail.neu.edu.cn

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Abstract:

For many years，the open stope method，caving method and tailings cement filling method are mainly used to mine the steeply inclined medium-thick ore body from open pit to underground.For some special areas，tailings cannot be used for filling.In order to improve the recovery efficiency，it is necessary to study the mining methods in combination with the geological conditions.In view of the steeply inclined and medium thick orebody from open-pit to underground mining in the north section of Qinglonggou mining area，the continuous dry filling of long room method was put forward.The method is on the basis of sublevel drilling and ore dropping by bench open stoping method，and according to the engineering geological conditions of the ore body and its stability，combined with the existing mining equipment and filling conditions of the mine.This method mainly use the subsection development，the subsection mining cutting，the pre-control roof，the medium-deep hole continuous blasting backward mining，the scraper continuous mining and continuous dry filling goaf. Stage is divided according to the orebody shape，and the drilling tunnels is excavated at the bottom layer in the first mining stage，and the previous layer pre-control roof provides drilling tunnels for the next layer mining.Arrange the cutting slot at the end of the mine and mining from one the side of the mine to the other side.Firstly，drill parallel holes upward in the cutting roadway.The row spacing of blasting holes is 1.2～1.5 m，and the spacing of parallel blasting holes is 1.2 m.After the blasthole is completed，cutting raise with free surface blasting can form cutting slot.The amount of ore from the cutting slot should ensure sufficient compensation space for the ore blasting in the stope.Medium-deep hole continuous ore break down is adopted.The stope is mining retracted from one side to the other.After the backfilling space is formed，the waste rock is poured into the stope through the filling roadway to a sufficient height to form the initial waste rock heap.The truck in the pit discharges waste rock on the waste rock heap.In principle，the stope is ventilated by the main air flow of the mine.The fresh air enters the stope along the drift from the sectional transport roadway through the perforation roadway.The waste-air passes through the upper part along the vein filling roadway，return to the upper part，and is collected and discharged to the return air well.The goaf is filled with waste rock while the medium-deep hole continuous ore dropping.This mining method simplifies the design of ore block exploitation，greatly reduces the amount of mining and cutting，and shortens the time of mining and cutting.Continuous mining is adopted to reduce pillar setting and increase ore recovery，and dry filling body is used to controlling mining site pressure.The field test in the north section of Qinglonggou mining area shows that the high-intensity and large-scale concentrated mining can be realized by adopting the continuous dry filling mining method for the steeply inclined medium-thick orebody，which improves the recovery rate of the ore block and reduces the loss of mineral resources.

Key words: steeply inclined, medium thick orebody, long room, continuous dry filling, mining technology, mining method, Qinglonggou mining area

CLC Number: 

  • TD853

Fig.1

Continuous dry filling of long room method"

Fig.2

3D geological model of north section of Qinglonggou mining area"

Fig.3

Acquisition map of continuous dry filling of long room method"

Fig.4

Layout of stope hole"

Fig.5

Schematic diagram of using continuous dry filling of long room method in M2 ore"

Table 1

Technical-economic indicators of north section of Qinglonggou mining area"

参数 数值 参数 数值
采场生产能力/（t·d-1） 307 损失率/% 9.6
生产效率/（t·班-1·d-1） 1 000 贫化率/% 7.5
凿岩工效/（m·台班-1） 100 作业成本/（元·t-1） 33.7
采切比/（m3·kt-1） 89.5 充填成本/（元·t-1） 13.6
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