Stability analysis of stope in pillarless sublevel caving
In recent years, enlarging structural parameters is gradually used in pillarless sublevel caving, which improves both the mining stability and economic efficiency. Therefore, …
A new diversion drawing technique for controlling ore loss …
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 …
Sublevel Caving Production Scheduling | Encyclopedia MDPI
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 ...
A visco-elastic theoretical model for analysis of dynamic …
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 ...
Numerical Simulation of Independent Advance of Ore …
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 …
Optimization research of structural parameters in non-pillar sublevel …
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.
Sublevel caving: Engineered to Perform
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 …
Structural Parameter Optimization for Large …
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 …
A visco-elastic theoretical model for analysis of dynamic
The dynamic ground subsidence due to mining is a complicated time-dependent process. Based on the theory of rock rheology, a theoretical model for the prediction and analysis of the dynamic subsidence due to deep underground mining is developed. The model is used for Chengjiao mine, an underground iron ore mine using pillarless sublevel caving method, to predict and analyse …
A global review of recovery, dilution and draw control in …
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.
CN102619514B
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 …
Draw Control Strategy for
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 ...
(PDF) A study of gravity flow principles of sublevel caving method …
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 ...
Sublevel caving
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. ...
(PDF) Behaviors and Overlying Strata Failure Law for …
In order to reduce the cost of filling, an improved pillarless sublevel caving method is proposed. is method greatly improves the ore recovery rate by adding a recovery route.
Lost-ore mining-A supplementary mining method to sublevel caving
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 ...
Sublevel Caving Method Without Sill Pillar | SpringerLink
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.
(PDF) Friction and Fragmentation Effects on Dilution in Sublevel Caving
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 ...
Sublevel caving: Engineered to Perform
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 …
Sub-level caving method | Download Scientific Diagram
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 ...
CN102619519A
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 …
CN102619515A
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 …
Sublevel Caving
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, low tonnage factors …
Application of similar VCR method in caving engineering
West mining area of Rongguan mining will switch to pillarless sublevel caving method in mine recovery under ∇1158 level. In order to ensure the smooth progress of projects, the 6 gobs in ∇1158 ...
Pillarless sublevel caving method based vertical …
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 …
A global review of recovery, dilution and draw control in …
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 …
CN102619514A
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 …
A VISCO-ELASTIC MODEL FOR ANALYSIS OF GROUND
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 …
Top-filled high-end-wall pillarless sublevel caving method …
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
Xu Shuai
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 ...