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Big parameter and multi-subsection of sublevel caving method without sill pillow in the base of undiluted ore drawing
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Journal of China University of Mining & Technology Vol.17 No.2 J China Univ Mining & Technol 2007, 17(2): 0295- 0300 Numerical Simulation of Independent Advance of Ore Breaking in the Non-pillar Sublevel Caving Method ZHOU Chuan-bo1, YAO Ying-kang1, GUO Liao-wu2, YIN Xiao-peng2, FAN Xiao-feng1, SHANG Ying1 1Engineering …
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Surface subsidence is a geological hazard resulting from sublevel caving (Chen et al. 2016). Sublevel caving is a mass mining method based on utilizing the gravity flow of the blasted ore and caved waste rock. Sublevel caving without sill pillars is the main mining method used in underground metal mines in China (Li et al. 2006). …
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Method Tonnes / Avg. Tonnes / Relative Mining Manshift Day Milled Cost/Tonne Resuing 0.20 - 0.50 50 - 100 + 70+ Shrinkage 20 - 28 200 - 800 20 - 50 Cut and fill 12 - 48 500 - 1500 20 - 70 Room and Pillar 15 - 150 1500 – 10 000 7 - 20 Open stoping 20 - 115 1500 – 25 000 7- 25 . Sub-Level Caving
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instability brought to the fault by the sublevel caving method without the sill pillar is greater than that brought to the fault by the lower layer filling method under the premise of only changing the height of the sublevel. Keywords: coordinated mining; fault dynamic response; lower -layer filling method; mining impact; sublevel caving ...
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The study on structural parameters of sublevel caving method without sill pillar applied in Jinshandian Iron Mine is made by ore-drawing test in laboratory,which adopted multi-segment three-dimensional ore-drawing model to determine 9 sets different structural parameters for the mining method by orthogonal test,in result,datum from the test are …
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Non-pillar sublevel caving is a widely used mining method which is based on the utilization of gravity to generate a flow of blasted ore and caved rock waste (Brady and Brown 2006; Villegas et al. 2011; Svartsjaern et al. 2016; Svartsjaern 2019; Xia et al. 2019). That is, the ore is fragmented by detonating blasts in holes drilled upwards in ...
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For the stope structure parameters of sublevel caving mining, it mainly includes three important indexes: sublevel height, route spacing and caving step distance, which have …
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The literature discusses a number of theoretical, small, and full scale experimental programs, which have aimed at identifying parameters influencing sublevel …
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Since the 1970s, the sublevel stoping mining method (Fig. 1) has been an open stope mining method with relatively advanced technology, high mechanization and efficiency, reasonable safety, and low loss for the application of trackless excavating equipment in the underground.Its main features include: (1) The stage height is 40–60 m …
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LKAB has been mining iron ore with the sublevel caving mining method in northern Sweden for more than 60 years. Throughout the years, LKAB has improved this mining …
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Block caving is an extreme case of sublevel caving in which instead of a back of ore 5 to 10 ft. thick, one 50 ft. thick is undermined and allowed to cave. The method is illustrated in Fig. 7. After the bottom of the block, or panel, is cut up into pillars by drift's and cross drifts, the pillars are robbed, and then the remaining stumps are ...
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2.2 Sublevel Caving Mining Method. Sublevel caving is one of the most advanced mining methods. This method is usually undertaken when mining the ore body through an open pit is no longer economically viable. In sublevel caving, mining starts at the top of the ore body and develops downwards.
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that of sublevel caving method with sill pillar and external force of drilling blasting is required ... forced caving of continuous extracting, without obvious ore block structure. In general, vertical deep hole extrusion blasting is used for caving, and the bottom structure is commonly set at the lower part of the stope. In Russia, the end ore ...
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The design and feasibility analysis of the Sublevel Caving by Pillar Extraction mining method are described. It is a conceptual mining method devised toward the objective of improving mining techniques for extraction of deep coal occurring in seams of thicknesses greater than 12 feet.
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Abstract: Non-pillar sublevel caving is beginning to use large structural parameters in China. Ap-propriate structural parameters can effectively control the loss and dilution of …
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Int. J, Rock Mech. Min. Sci. Vol. 3, pp. 129-153. Pergamon Press Ltd. 1966. Printed in Great Britain SUBLEVEL CAVING* I. JANELID and R. KvhPm Department of Mining and Mine Surveying, Royal Institute of Technology, Stockholm, Sweden (Received 1 November 1965) A~traet--The following article contains a summary of the results obtained by …
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After the stope structure parameters, hole arrangement parameters, blasthole layout form, initiating mode and ore drawing mode of sublevel caving without sill pillar in Shenbu Copper Mine had been improved, ore loss and dilution ratio, unit consumption of explosive were reduced, production ability was increased, and good technico economical indexes …
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Weak rock mass and poor flow of material can cause excessive ore loss and dilution in sublevel caving. This paper proposes a method to establish design parameters for an inclined deposit within a weak rock mass and evaluates its effectiveness through a case study. In order to solve the problem of low production capacity and poor safety …
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Because the structural parameters of the sublevel caving mining method can directly affect the ore recovery ratio and recovery efficiency, and then affect the overall technical ... parameters of sublevel caving without a sill pillar is that "the morphology of the caving body should be consistent with that of the drawn-out ore body". Jin et ...
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Longwall Longwall in coal Longwall in Hard Rock Sublevel Caving Characteristics of the ore body and mining method Development Production Equipments Used Block Caving Introduction Historical ...
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Zhou et al. (2007) conducted numerical simulations and physical model validations on the independent advance of ore breaking using the non-pillar sublevel caving method, and they discussed the mechanism of stress generation and propagation by detonation loading using five separate independent-advance ore breaking patterns.
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Design of a new layout for sublevel caving at depth C Quinteiro Luossavaara-Kiirunavaara Aktiebolag (LKAB), Sweden Abstract LKAB has been mining iron ore with the sublevel caving mining method in northern Sweden for more than 60 years. Throughout the years, LKAB has improved this mining method to stay competitive in a tough …
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Non-pillar sublevel caving is beginning to use large structural parameters in China. Appropriate structural parameters can effectively control the loss and dilution of stope and improve ore ...
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Inf. Circ. 6350.—Undercut Block-Caving Method of Mining in Western Copper Mines, by E. D. Gardner. 1930. 44 pp. ... Sublevel stoping. 2. Open stopes with pillar supports. (a) Casual pillars. (b) …
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Mining - Blasthole Stoping, Ore Extraction, Drilling: When the dip of a deposit is steep (greater than about 55°), ore and waste strong, ore boundaries regular, and the deposit relatively thick, a system called blasthole stoping is used. A drift is driven along the bottom of the ore body, and this is eventually enlarged into the shape of a trough. At …
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1.. IntroductionSublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1].The method functions on the principle that ore is fragmented by blasting, while the overlying host rock fractures and caves under the action of mine-induced stresses and gravity [2].The caved waste …
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With the gradual mat urity of pillarless sublevel caving method, it has been. ... H. W. Deng, Stope parameter optimization of sublevel caving without sill pillar in Xiadian gold mine. Mining ...
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1200-2 working face is mined by comprehensive mechanized top coal caving method and adopts strike longwall roadway layout. The 1200-2 fully mechanized top coal caving working face is located in ...
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Much of the theory upon which the Sublevel Caving (SLC) method is based was developed in Scandinavia many years ago. It was based mainly on bin' theory and ellipsoid of draw' configurations derived from sandbox models. In many cases, classical SLC layouts influenced by these early theories obtained relatively poor results. Early dilution entry, …
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