top al caving mining method
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top al caving mining method

Caving mechanisms of loose top-coal in longwall top-coal ...

Oct 01, 2014 · The top-coal caving longwall mining is one of the major mining methods for extracting thick coal seams in China. The top-coal caving mining was estimated to have produced about 0.6 billion metric tons every year, accounts for 18% of underground coal mining in China .The major features of the top-coal caving mining are that a conventional longwall mining with cutting height 2–3 m is

Caving mechanisms of loose top-coal in longwall top-coal ...

The top-coal caving mining method, developed steadily in the past two decades, has become the main method for thick seam coal mining in China. In recent years, the core research areas in the top-coal caving mining are the mechanisms of top-coal caving and the improvement of top-coal recovery ratio.

Top Coal Movement Law of Dynamic Group Caving Method in ...

Jul 07, 2020 · 高达10%返现 · With different top coal caving intervals, top coal caving sequences, caving methods, and dip angles, Sun et al. carried out 15 experiments, proposing that the combination mode of the single-opening sequence caving method (SSCM) from lower to upper in layout direction and one mining and one caving in the advance direction had the highest ...

Stress analysis of longwall top coal caving - ScienceDirect

Top coal caving is an economical underground mining method, which has recently been introduced, modified and practiced in the underground coal mines of China. The method and its consecutive modifications can be linked to the original method of soutirage mining developed in France during the 1960s [1]. Longwall top coal caving (LTCC) is cost ...

The Principle of Longwall Top Coal Caving (LTCC) - YouTube

Apr 30, 2015 · Caterpillar has extensive experience in the design of roof supports for specific mining conditions. Cat Longwall Top Coal Caving (LTCC) roof supports allow m...

Viewpoint Mining Magazine - Longwall Top-Coal Caving

Fortunately, there is a method that can allow a longwall system to recover all the coal in a high seam safely and efficiently without the geological and ecological concerns caused by partially mining the seam. The Longwall Top-Coal Caving (LTCC) method makes use of a second conveyor and the natural force of gravity to recover coal above the ...

Longwall Top Coal Caving (LTCC) Mining Technology

Longwall Top Coal Caving (LTCC) is a special designed longwall mining method for very thick seams (thickness is more than 4.5m) where good quality coal is being left because "conventional" longwall equipment has not yet been designed to operate successfully beyond around 5m mining height. It enables an increased recovery for only an incremental ...

Force chains in top coal caving mining - ScienceDirect

Mar 01, 2020 · The key subjects involve the mechanism and criteria of top-coal fracturing, splitting and caving, the laws of discrete top coal collapsing and flowing, the formation and transition of mining induced pressure with respect to time and space, and the load on the supports rose from the top coal and overlying strata.1, 2, 3 Wu 4 proposed a self ...

Top Coal Movement Law of Dynamic Group Caving Method in ...

Jul 07, 2020 · With different top coal caving intervals, top coal caving sequences, caving methods, and dip angles, Sun et al. carried out 15 experiments, proposing that the combination mode of the single-opening sequence caving method (SSCM) from lower to upper in layout direction and one mining and one caving in the advance direction had the highest ...

(PDF) Underground mining Methods - ResearchGate

Caving (i.e., Sublevel and Block) mining methods are v aried and versatile an d involve ca ving the ore and/ or the overlying rock. Sub sidence of the surface normally occu rs afterwar d.

(PDF) Mining method selection and optimization of ...

The target of the method can be achieved by comparison among the values obtained by various alternatives of combined mining (Abdollahisharif et al., 2008). A different research through an analytical procedure was done to determine open-pit to underground transition depth of tabulate deposits.

Caving Underground Mining Methods (longwall, Sublevel ...

Oct 23, 2014 · Caving Underground Mining Methods (longwall, Sublevel caving, & Block caving) 1. 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.

Utilizing a Value of Information Framework to Improve Ore ...

processing requirements and monthly production targets. Kiruna’s mining method, sublevel caving, leads to a high degree of ore dilution during recovery, which, in turn, creates significant uncertainty in the quality of the extracted ore. We evaluate an ore grade scanner technology that

A New Mathematical Model for Production Scheduling in Sub ...

Production scheduling in underground mines is still a manual process, and achieving a truly optimal result through manual scheduling is impossible due to the complexity of the scheduling problems. Among the underground mining methods, sub-level caving is a common mining method with a high production rate for hard rock mining. There are limited studies about long-term production scheduling in ...

Numerical Analysis for the Caving Characteristics of Rock ...

Jun 14, 2021 · Hassen et al. analyzed an attentive caving phenomenon incorporating main geotechnical parameters based on the discrete-element method and finite-element method. Vyazmensky et al. [ 16 ] analyzed the interaction between block cave mining and a large overlying open pit by finite-element modeling/discrete-element modeling.

BBR study of top-coal drawing law in longwall top-coal ...

[11]Wu Jian.Theory and practice of sub-level caving method in China[J].Journal of China Coal Society,1991,16(3):1-11(In Chinese). [12]Wang Jiachen,Yang Shengli,Li Yang,et al.Caving mechanisms of loose top-coal in longwall top-coal caving mining method[J].International Journal of Rock Mechanics&Mining Sciences,2014,71(10):160-170.

mining methods type

Types of Underground Mining Method Comparison. 16-03-2017 Methods of mining include stoping, caving, and various methods of working large deposits which, in addition to the method of actually breaking the ore, require elaborate and definite plans of, development of the orebody.

Longwall mining - Wikipedia

Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 0.6–1.0 m (2 ft 0 in–3 ft 3 in) thick). The longwall panel (the block of coal that is being mined) is typically 3–4 km (1.9–2.5 mi) long and 250–400 m (820–1,310 ft) wide.

Application Of The Longwall Top Coal Caving System In Austra

Sep 08, &#; The longwall was a China National Coal Mining Equipment (CME) top caving face, 240 metres wide and with a 2km panel length The operation is a 365 days, 24/7 operation The mine, which features two top coal caving faces and which has been operating since January , has planned utilisation to keep the output conveyor belt full.

Quantitative Evaluation of Top Coal Caving Methods at the ...

Apr 10, 2021 · The top coal caving method is a systematic combination of caving sequence and caving amount, and it possesses a major effect on the top coal recovery in the working face. The current selection process of top coal caving methods is mainly based on physical similarity simulation and empirical control from field tests.

Rule-based expert system to assess caving output ratio in ...

Sep 04, 2020 · Wang JC, Yang SL, et al. Caving mechanisms of loose top-coal in longwall top-coal caving mining method. International Journal of Rock Mechanics & Mining Sciences. 2014;71:160–170. View Article Google Scholar 28.

Numerical simulation of realistic top coal caving ...

Jun 24, 2021 · Yang et al., by using the method of numerical simulation, analyze the top coal recovery rate of the dynamic group caving method (DGCM) and single-opening sequence caving method

3D numerical modeling of longwall mining with top-coal caving

Tel.: +90 312 2977 600; fax: +90 312 2992 ciency of production is significantly higher. The top- 155. coal-caving method was first applied in the 1940s in E-mail address: [email protected] (B. Unver). Russia and then subsequently used in France, former 1365-1609/$ - see front matter r 2004 Elsevier Ltd.

Definition of top slicing and cover caving

A mining method that entails working the orebody from the top down in successive horizontal slices that may follow one another sequentially or simultaneously. The whole thickness of the slice is worked. The ore may be broken by overhand or underhand stoping in each unit. The overburden or cover is caved after mining a unit.

Manuscript V1 V1 | Preprints

The average coal seam thickness was approximately 15.3 m. Fully mechanized top-coal 89 caving mining method was employed. The coal was cut to a height of 3.9 m while the top coal caving 90 height averaged 11.4 m. ZF/15000/27.5/42 hydraulic supports were used. No.5404 and No.5105

Stoping Mining Methods

Apr 03, 2017 · The method is similar in some respects to sublevel caving—the ore is mined from the top downward by a series of slices, and the overlying strata cave and follow the mining downward with a mat intervening between the caved overburden and the ore beneath.

Block caving method - SlideShare

Jul 14, 2014 · Block caving is the mining method in which masses, panels, or blocks of ore are undercut to induce caving, permitting the broken ore to be drawn off below. If the deposit is overlain by capping or bounded by drawing the ore. This method is unlike sublevel caving, in that both the ore and the rock are normally involved in the caving.

Chapter 1 LONG- AND SHORT-TERM PRODUCTION

This mining pattern is necessary to correctly execute the sublevel caving method so that the mined out areas do not collapse on top of ore that is yet to be retrieved. Minimum and maximum production levels per month govern the rate at which the blocks within a machine place-ment are mined. These rates ensure continuous mining of machine placements,

Determination of the Transition Point from Open Pit to ...

Thus, focus on the selection of UG mining method must be a part of this analysis This paper presents an implementation of an integer programming (IP) based mathematical model that evaluates the changes in mining layout and the project value under possible variation in the transition point from OP to UG mining for stoping and block caving methods.

Geotechnical considerations in design of the new mining ...

The old mining method at Munali Nickel Mine was sub-level caving mining method (Tetra Tech, 2015). The major geotechnical challenge faced with sub-level caving mining method was the caving of the crown pillar resulted into major sinkhole on the southern part of the mine (Tetra Tech, 2015).

The Key Stratum Structure Morphology of Longwall ...

Aug 28, 2020 · Longwall mechanized top coal caving mining (LMTCCM) in extra-thick coal seams has its own characteristics. The law of mining pressure and overlying strata failure height in extra-thick coal seams are much larger than those of medium-thick and thick coal seams. The key stratum structure morphology also has an important influence on the law of overlying strata movement and stability of ...

Implementing a production schedule at LKAB's Kiruna Mine

LKAB's Kiruna Mine, located in northern Sweden, produces about 24 million tons of iron ore yearly using an underground mining method known as sublevel caving. To efficiently run the mills that process the iron ore, the mine must deliver planned quantities of three ore types. We used mixed-integer programming to schedule Kiruna's operations, specifically, which production blocks to mine and ...

ResearchontheInfluenceoftheKeyStratumPositiononthe ...

Values of this working face are as follows: PH 1 PH 2 15m, PH 3 20m, M 1 10m, N 5m, c 1 25kN/m 3,c 13kN/m3,B 1.75m,andL 6m. Fromthis,thefollowingcanbeestimated. When ...

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