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Metal Mine ›› 2019, Vol. 48 ›› Issue (09): 28-33.

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Study of Cluster Continuous Mining Method with Steeply Inclined Thin Ore Groups Based on Synergistic Mining Theory

Nie Xingxin,Gan Quan,Lou Yibo,Gao Jian,Feng Shanshan   

  1. School of Resources Engineering,Xi'an University of Architecture and Technology,710055 Xi'an,China
  • Online:2019-09-15 Published:2019-10-10

Abstract: Shallow-hole shrinkage mining method is often adopted in mining of steeply inclined thin vein group,the shortcomings of small yield,low efficiency and high labor intensity of the method are existed.Based on synergistic mining theory,the existing thin vein mining methods are analyzed,a new type of cluster continuous mining method is designed,named as deep hole segmentation open stoping continuous mining method with upper post-filling.In this method,the stages are divided into sections,and sections are divided into chambers,no pillar and bottom pillar are left in chambers,and mining operation is carried out in one step,and then filling operation is done.Stoping and filling operations are carried out intervals.Continuous stoping operation is carried out in the same stage with no follow-up operations.In view of the six gold ore veins (named as M5,M6,M7,M8,M9,M10 respectively) of a gold mine in Qinghai Province,a sequential step-by-step continuous recovery sequence is proposed,and the sequence of the recovery is numerically simulated.The analysis results show that the maximum displacement is about 16.8 mm,the maximum principal stress is about 0.076 7 MPa,and the actual plastic zone range is 2~5 m,which can meet the safety requirements.The mining practice results of the mine show that:the mining method has a depletion rate of 9.51%,ore loss rate of 7.98%,production capacity of 96 t/d and stope production capacity of 576 t/d,compared with the ordinary shallow-hole shrinkage mining method (the depletion rate is 13.57%,the ore loss rate is 15.61% and the production capacity of a single chamber is 62 t/d),the mining method proposed in this paper can effectively improve level of continuous mechanized mining operation,production capacity and stope efficiency effectively,besides that,it can also guarantee the safety and orderly when multiple ore veins are mined at the same time.

Key words: Cluster continuous mining, Steeply inclined thin ore veins, Shallow-hole shrinkage mining method, Numerical simulation, Mining process, Synergistic mining