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A study of gravity flow principles of sublevel caving method in dipping narrow veins. S Xu, FT Suorineni, L An, Y Li. Granular Matter 19 (4), 1-13, 2017. 15: ... Optimization of caving space for different angles of end-wall during pillarless sublevel caving. S Xu, L An, YH Li, XH Dai. Journal of Northeastern University (Natural Science) 33 (1 ...
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The invention relates to a top-filled high-end-wall pillarless sublevel caving method extraction technique. The high-end-wall pillarless sublevel caving method is characterized by comprising the following steps of: (1) after ore drawing is completed, stretching a grouting tube deep into overlaying rocks by using a grouting device at both sides and front part of the end part of a …
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Since the non-pillar sublevel caving method is detonated under a loose rock cap the capping detonation needs less explosive energy. The lower stress values of the 1.8 m and 2.2 …
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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 drawing efficiency. In this study, taking …
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Recent developments in sub-level cave mining have advanced the understanding of the technique and its production performance, which allow it to now be considered as a highly …
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High ore loss and dilution, which are mainly caused by direct contact between blasted ore and caved rock, generally exist in the process of exploiting inclined medium-thick ore bodies using the sublevel caving method. An improved diversion drawing technique was proposed with the aim of controlling ore loss and dilution by changing the flow path and velocity of caved …
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sublevel caving mines AD Campbell Beck Engineering Pty Ltd, Australia Abstract Sublevel caving (SLC) has previously been regarded as a high dilution and low recovery mining method requiring specific orebody geometry and rock mass conditions to be successful. Progress in the past 20 years at numerous operations has broken this misconception.
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Source: Mining Magazine, September 2013. Sub-level caving is a highly efficient, top-down, underground bulk mining method. Recent developments in sub-level cave mining have advanced the understanding of the technique and its production performance, which allow it to now be considered as a highly viable alternative to open stoping and, in some cases, even to …
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The invention relates to an ore drawing technique for controlling fluidity of ore rocks via pillarless vertical end-wall sublevel caving method. The pillarless vertical end-wall sublevel caving method is characterized by comprising the following steps of: after ore drawing at each sublevel is completed, injecting and permeating a liquid medium into overlaying rocks surrounding the ore …
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Abstract: Sublevel caving (SLC) has previously been regardedas a high dilution and low recovery mining method requiring specific orebody geometry and rock mass conditions to be successful. Progress in the past 20 years at numerous operations has broken this misconception. A wide range of challenges have been encountered and mitigated at operations around the world, …
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The ground movement process induced by the pillarless sublevel caving method is a complicated process. According to theory of rock rheology, the theoretical model for the prediction and analysis ...
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The results from numerical simulation have been validated by tests with physical models. Key words: non-pillar sublevel caving method; independent advance of ore breaking; numerical simulation; model test CLC Number: TD 8 1 Introduction The sublevel caving technique has been widely employed in the underground mining of metals.
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The pillarless sublevel caving is one of major mining methods in underground mine at home and abroad.As for the equipment constraint of rock drilling and blasting,the sublevel caving with small structural parameters has been applied for a long time processing with dynamite,and ore removal,which caused some problems such as serious ground pressure and low mining …
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Sublevel caving (SLC) is a mass mining method having high productivity and high safety. However, this method often causes a considerable amount of permanent ore loss. Interestingly, all lost ores ...
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Among all underground mining methods, the sublevel caving (SLC) method is a common method with moderate development requirements, high production rate, and high degree of mechanization and flexibility. None of the manual planning methods and heuristic algorithms used in commercial software will lead to a truly optimal schedule. In sublevel ...
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The present invention discloses a method for non-technical measures the gently inclined ore mining conditions pillar sublevel caving method method which "vertical partitioning ore, in combination, and a disk replenish residual caving full coverage" by the other, to solve SUBLEVEL the sublevel caving ore under conditions effective gently inclined segment mining …
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The results of this study are helpful for The shrinkage mining method is an underground method like sublevel caving but with a continuous backfilling operation from the top.
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In addition, exploitation of minerals using caving methods such as the pillarless sublevel caving method will result in surface subsidence. For example, Chengjiao iron mine, in which the pillarless sublevel caving was used, there has been widespread deformation of land surface far away from the mining area. This phenomenon can cause ...
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Advantages of sublevel caving method without sill pillar: the stope has a simple structure, which is beneficial for the operation of large mechanized trackless self-propelled …
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The results of this investigation show that the horizontal strata visco-elastic model (VEM) is more apt to propagate vertical movements due to deep mining by pillarless sublevel …
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Schematic layout for sublevel caving (after Hamrin, 1982) DEFINITION: A mining method which is applicable to low grade near -vertical metallic or nonmetallic deposits. Mining progresses …
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Then stopping proceeds with step-by-step blasting method. A caving overlying rock layer equal to 1.5–2 times the sublevel height must be maintained in the upper part of the stopping sublevel. Equipment shafts or ramps are arranged at a certain interval along the strike, in order to deliver equipment, materials, and personnel to the sublevel.
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The non-pillar sublevel caving method with large structural parameters used in Mao Gong Iron Mine is of high rate of dilution and loss, and the ore recovery rat. ... New Mining Technology of Pillarless Sublevel Caving with High Sublevel and Large Drive Interval.
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Sublevel Caving Mines A probabilistic approach ISSN 1402-1757 ISBN 978-91-7790-021-4(print) ISBN 978-91-7790-022-1 (pdf) ... Sublevel caving (SLC) is an underground mass mining method used for extracting different types of ore from the earth crust. Different unit operations (drilling, blasting, loading and transportation) are performed in ...
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Topic 7: Underground Mining Methods Longwall Sublevel Caving Block Caving Hassan Z. Harraz hharraz2006@yahoo 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
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A numerical scheme is developed based on the commercial Particle Flow Code in 2-Dimensions (PFC 2D) to Investigate the effects of lateral opening angel on ore drawing In pillarless sublevel caving ...
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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 ...
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The invention relates to a top-filled pillarless cornice end-wall sublevel caving method extraction technique. The pillarless cornice end-wall sublevel caving method is characterized by comprising the following steps of: (1) after ore drawing is completed, stretching a grouting tube deep into overlaying rocks by using a grouting device at both sides and front part of the end part of a …
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Metal grade dilution is the main production disadvantage of the sublevel caving method, and overcoming this problem has been investigated over the years using different methodologies. Herein, numerical simulation using the discrete element method is ... Numerical Investigation of Caved Rock Mass Friction and Fragmentation Change Influence on ...
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The ground movement process induced by the pillarless sublevel caving method is a complicated process.According to theory of rock rheology, the theoretical model for the prediction and analysis of the ground subsidence due to deep underground mining by the pillarless sublevel caving method is given.By applying the model to actual cases of underground iron ore mining by the …
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A segmented caving method without pillars, which is applied in ground mining, earthwork drilling, underground mining, etc. It can solve the problems of overburden rock bonding, easy to increase bonding, and affect fluidity, etc., and achieve economic benefits Obvious, popular, and effective in preventing surface subsidence
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The loss and dilution of ore by sublevel caving mining method is influenced by gravity flow principles of caved granular materials (rocks). Gravity flow of broken rock (muck) in dipping narrow ...
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Sublevel caving method with sill pillar is the mining process in which a level is divided into several sublevels, a bottom structure specifically used for ore removal is furnished at the lower part of each sublevel, and stoping of ore proceeds from the top sublevel to the bottom sublevel (Fig. 1).It is also called sublevel caving method with bottom structure.
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Sublevel caving (SLC) is a top-down mining method that relies on gravity flow of ore that is fragmented by blasting (Kvapil 1965). Blasted ore is extracted in accordance with a prescribed …
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Outline of Topic 7: Longwall Longwall in coal Longwall in Hard Rock Sublevel Caving Characteristics of the ore body and mining method Development Production Equipments Used Block Caving
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The sublevel caving method is characterized by a gravity flow of lumpy material because both the blasted ore and the waste may contain large lumps of over 400 mm. To optimize the production of clean ore and to minimize contamination by waste as well as ore losses, it is necessary to determine the optimum parameters of the slice. ...
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