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punch longwall mining method advantages

punch longwall mining method advantages

Punch Longwall Mining Introduction underground

Punch Longwall Mining This is a rather specialized type of mining which is only applicable where a seam is exposed at the highwall of an open cut mine which has reached the economic limit for open cut mining. It could also be applied where a seam has an extensive natural outcrop, but there are no instances of this in Australia known to the writer.

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PUNCH LONGWALL MINING – Mining Science and

Punch longwall mining is carried out using single entry gateroads as the they are only used by one panel. The adjacent panels can be similarly extracted with fresh entries being driven adjacent to the previous mined out panel leaving a barrier pillar of suitable width to provide safe retreating of the new panel as shown in Figure 2 opposite.

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University of Wollongong Research Online

2020-10-13  Punch longwall mining takes advantage of the final highwall exposure in an open cut coal mine, driving gateroads straight into the targeted coal seam then retreating the longwall back to just short of the highwall. A designed barrier pillar remains between the final longwall position and the

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Longwall Mining Overview Introduction

The benefits of longwall mining compared to other methods of pillar extraction are: Permanent supports are only needed in the first workings portion and during installation and recovery operations. Other roof supports (longwall chocks or shields on modern longwalls) are

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Longwall Mining Method and Design - 911 Metallurgist

2018-5-30  Advances in Longwall Mining Method have made this system more economically attractive because of its efficiency and production potential. The high productivity being achieved by longwall mining demonstrates its potential for being a substantial segment of underground coal production. Longwall mines

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CASE STUDY ON LONGWALL MINING - IRJET

2020-6-6  Longwall Mining method is one of the latest mechanized method and classified into two types 1. Longwall advancing. 2. Longwall retreating. ... Punch Entry-5 (PE-5). About 3500Cu.m/min of chilled air is being supplied at 11 to 13 0C at the entry of PE-5. From there cooled air is ...

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Longwall Mining - SlideShare

2010-4-30  Punch Longwall Advantages Step change in cost and productivity More production capacity High productivity low cost Longer term and higher % of reserves extraction Easy logistics – near surface High gate road development rates feasible

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Shortwall Mining Introduction underground COAL

This method of mining was developed in the late 1960's to take advantage of the then recent development of suitable hydraulic longwall supports, coupled with the productivity and low capital cost of continuous miners and shuttle cars. In effect it gained some of the advantages of longwall mining without the cost of installing a complete set of ...

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LONGWALL ADVANCE MINING – Mining Science and

An alternative method of mining is advance longwall mining. In longwall advancing, the longwall face is set up a short distance from the main development headings. The gate entries of the longwall face are formed as the coal is mined. The gate roadways are

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Comparison of Advancing and Retreating Longwalls ...

The only real advantages of advancing longwalls are: Production can begin earlier as the mine does not have to wait for the gate roads to be developed before longwall production can commence (provided development rates are adequate this should only apply for the first longwall in a mine)

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PUNCH LONGWALL MINING – Mining Science and

PUNCH LONGWALL MINING. Figure opposite shows a general layout of punch longwall mining. The aim of this method is to mine coal form the highwall of an open cut operation, in which the stripping ratio is far outweighs the production cost of coal mined. The method consists of driving a set of headings in to the coal seam from the highwall of an ...

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CASE STUDY ON LONGWALL MINING - IRJET

2020-6-6  Longwall Mining method is one of the latest mechanized method and classified into two types 1. Longwall advancing. 2. Longwall retreating. ... Punch Entry-5 (PE-5). About 3500Cu.m/min of chilled air is being supplied at 11 to 13 0C at the entry of PE-5. From there cooled air is ...

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Advancing and Retreating Longwalls ~ Mining

2017-5-26  Advancing longwall gateroads typically require extensive maintenance to maintain the roadway cross-section (roof and floor brushing) during the life of the longwall block, whereas retreat longwall gateroads are allowed to collapse behind the retreating face. The only real advantages of advancing longwalls are: Production can begin earlier as ...

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Shortwall stoping versus sub-level longwall caving-retreat ...

2009-8-26  Current longwall mining method applied in the mine The current method used in the above-mentioned mines is a sub-level longwall caving-retreat method. In this method, the face is formed perpendicular to the seam strike and implemented in the form of slices 7.5 m thick from the top downwards (Figure 1). Because the geotechnical properties

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HISTORY AND METHODS – Mining Science and

Longwall mining is increasing in application to coal winning in Australian Underground mining operations. The mechanised method of longwall mining was first introduced to Australia in 1963 and currently (2005)there are 27 longwall faces operating in Australia. Production from Australia’s longwall

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What is Longwall Mining? (with pictures) - InfoBloom

Longwall mining replaces the historical "room-and-pillar method", whereby underground "rooms" of coal are manually extracted and pillars are left to support the roof so miners can work safely. In mining regions deeper than 1,000 feet (300 meters), the room-and-pillar method

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Longwall Mining Equipment - Barloworld Equipment

2015-5-28  We have been designing and building longwall plows since 1941 – and things have come a long way. Technical developments since 1990 have once again established plowing as the preferred longwall mining method for seams below 1.8 m (71 in). Cat plows offer world-leading features that other manufacturers cannot and a cost of ownership

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Underground Mining Methods and Equipment

2020-8-25  Longwall mining is used in horizontal, tabular deposits (mainly coal), while the others have applications in inclined or vertical, massive deposits, a lmost exclusively metallic or nonmetallic. Because the exploitation openings are intentionally destroyed in the progress of mining, the caving class is truly unique. Rock mechanics principles are

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A General Review on Longwall Mining-Induced

It is believed that underground longwall mining usually produces fractures in the surrounding rocks. On the one hand, mining-induced fractures not only degrade the strength of the rock mass but also serve as main channels for fluids (e.g., water and methane). Fractures facilitate the failure of the rock mass and fluid inrush into working spaces.

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Fractures above Longwall Mines Using Backfilling

2019-12-3  In recent years, by combining the advantages and concepts of the Wongawilli rapid mining method [21,22] and pillar backfilling mining [23], the writers proposed continuous excavation and continuous backfilling (CECB) in longwall mining and explored

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Longwall Mining - an overview ScienceDirect Topics

longwall mining Mining. a mining method in which very long rectangular blocks of coal are defined during the development stage of the mine and then extracted in a single continuous operation by an automated cutting head moving parallel to the coal face.When the coal is cut, the working area is protected by a movable, powered roof support system. As the face progresses, the immediate roof above ...

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What is Longwall Mining? (with pictures) - InfoBloom

Longwall mining replaces the historical "room-and-pillar method", whereby underground "rooms" of coal are manually extracted and pillars are left to support the roof so miners can work safely. In mining regions deeper than 1,000 feet (300 meters), the room-and-pillar method

Get Price

LONGWALL ADVANCE MINING – Mining Science and

LONGWALL ADVANCE MINING. An alternative method of mining is advance longwall mining. In longwall advancing, the longwall face is set up a short distance from the main development headings. The gate entries of the longwall face are formed as the coal is

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University of Wollongong Research Online

2020-10-13  longwall punch mining or wall-to-wall mining is obvious. There are several clear operating advantages to operating a longwall in this way and where highwalls are available, the best economic decision will generally favor planning a direct approach.

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Highwall stability implications from longwall mining at ...

2020-10-13  Punch longwall mining at Broadmeadow mine commenced in 2005 from Ramp 4 of the Goonyella Riverside Coal Mine, mining longwall blocks from east to west toward the highwall and sequencing them north to south (Figure 5). Longwall blocks 15 were recovered from this - first pit.

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Mining Science and Technology - Longwall Mining

Resouces. Published papers, Thesis, Reports, Presentations and more. Click to Download ...

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Underground Mining Methods and Equipment

2020-8-25  Longwall mining is used in horizontal, tabular deposits (mainly coal), while the others have applications in inclined or vertical, massive deposits, a lmost exclusively metallic or nonmetallic. Because the exploitation openings are intentionally destroyed in the progress of mining, the caving class is truly unique. Rock mechanics principles are

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CHAPTER 11 Mining Technology - Princeton

2007-3-19  however, that longwall mining will realize these advantages in all underground mining environments or that longwall mining can be 2F. X. Murray (cd.), Where We Agree: Report of the National Coal Policy Project (Boulder, Colo.: Westview Press, 1978).

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Fractures above Longwall Mines Using Backfilling

2019-12-3  In recent years, by combining the advantages and concepts of the Wongawilli rapid mining method [21,22] and pillar backfilling mining [23], the writers proposed continuous excavation and continuous backfilling (CECB) in longwall mining and explored

Get Price

A General Review on Longwall Mining-Induced

It is believed that underground longwall mining usually produces fractures in the surrounding rocks. On the one hand, mining-induced fractures not only degrade the strength of the rock mass but also serve as main channels for fluids (e.g., water and methane). Fractures facilitate the failure of the rock mass and fluid inrush into working spaces.

Get Price

A Brief Comparison of Longwall Methods Used at Mining

2009-9-17  to Hartman and Mutmansky (2002), longwall mining is an exploitation method used in flat-lying and tabular deposits, where a long face is established to extract the mineral. In coal longwall mining, large blocks of coal seam (about 300 m wide and 2 to 3 km long) are developed by driving headings, known as "gate roads" or "road ways" around them,

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Longwall Mining - an overview ScienceDirect Topics

Stanley R. Michalski, in Coal and Peat Fires: A Global Perspective, 2011 Longwall Coal Mining. The longwall-mining method is a continuous mining system that was developed for mining coal deposits uniform in thickness and slope or where the overburden pressures may crush support pillars or for improving productivity. This method relies on the complete extraction of the coal in a designated area ...

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Maptek - Highwall stability in longwall mining

Punch longwall mining increases the risk of mine inundation due to the low elevation and wide catchment area. Large levees are constructed to protect the open pit from flooding by adjacent rivers. Sumps constructed against the highwall between the headgate and tailgate portals control rainfall and rock hazards in the pit catchment.

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University of Wollongong Research Online

2020-7-2  Punch Longwall: A method of longwall mining from the highwall of an open cut operation, in which the stripping ratio far outweighs the production cost of coal mined as shown in Fig. 3. Fig. 2 Longwall Panel Abutment Stresses . Fig. 3 Punch Longwall Mining

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What is Longwall Mining? (with pictures) - InfoBloom

Longwall mining replaces the historical "room-and-pillar method", whereby underground "rooms" of coal are manually extracted and pillars are left to support the roof so miners can work safely. In mining regions deeper than 1,000 feet (300 meters), the room-and-pillar method

Get Price

Optimization of Chain Pillars Design in Longwall Mining

2021-5-5  geometry of the coal seams, mechanized longwall mining is applied. The most important coal seam in Tabas is named C1 with a thickness of 1.8 m (Hosseini, 2007). The part of this coal seam that is using the mechanized longwall method is accessed by an inclined slope. The face length (panel width) ranges from 200 to 220 meters.

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Underground Mining Methods and Equipment

2020-8-25  Longwall mining is used in horizontal, tabular deposits (mainly coal), while the others have applications in inclined or vertical, massive deposits, a lmost exclusively metallic or nonmetallic. Because the exploitation openings are intentionally destroyed in the progress of mining, the caving class is truly unique. Rock mechanics principles are

Get Price

The efficiency of longwall systems in the case of using ...

2021-4-2  height exceeding 1.6 m. In the case of mining the seams of 2.0÷2.5 m in thickness, the daily production rates from one longwall face reached up to 20 000 Mg/day of the coal run-of-mine, and for the longwall faces of the height 1.6-2.0 m – 15 000 Mg/day. In Fig. 5 longwall systems, used in the Bogdanka Mine, are presented. Fig. 5.

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Longwall - SlideShare

2015-9-15  Longwall mining method includes drivage of two long roadways in coal and joining them at the end by a perpendicular drivage forming a face. 5. High Recovery. Lower Operating Costs. Easier to Supervise. Easier to Train Miners. Works Under

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Fractures above Longwall Mines Using Backfilling

2019-12-3  In recent years, by combining the advantages and concepts of the Wongawilli rapid mining method [21,22] and pillar backfilling mining [23], the writers proposed continuous excavation and continuous backfilling (CECB) in longwall mining and explored

Get Price