Types of Underground Mining Method Comparison
Long-Wall StopingmMining Method. After starting an overhand stope the shape in which the back is carried is often of prime importance. In A, Fig. 2, is illustrated the method of carrying a flat or longitudinal back (the term long-wall is used sometimes when the vein lies nearly flat). ... Advantages: The cost of mining is low, because a large ...
PUNCH LONGWALL MINING – Mining Science and Technology
The features of this system of mining include: The system requires no transport, conveyor drifts, shafts, complex ventilation systems or main headings as in conventional underground mining methods, hence this benefit provides cheaper, faster, …
A new automated, safe, environmentally sustainable, and …
Longwall mining is currently the safest and most effective method for soft rock deposits, especially coal. Unlike room and pillar, which has a typical extraction range of 40–60% depending mainly on
University of Wollongong Research Online
structure and mine systems from the surface to the face for advance and retreat mining with longwall, shortwall or room and pillar panels. INTRODUCTION. Longwall mining is considered the most productive and cost effective method of underground coal mining used in the world today. The reason longwall systems are so productive is simple.
Longwall Ventilation | Introduction | underground COAL
punch longwall mining ; shortwall mining; alternative shortwall mining method - gretley colliery; longwall top coal caving ; ventilation. main fans ; main airways ; secondary or panel airways ; development face ventilation ; longwall ventilation ; ventilation planning ; ventilation equipment suppliers ; ventilation consultants ; gas control ...
Longwall Mining | SpringerLink
Abstract. Since the early 1980s, the longwall method has developed into the safest, highest producing and most productive form of underground coal mining, rivalling the performance of many surface mining operations. This is due in large part to the rapid uptake of computer based technologies for automation and monitoring; improved …
CASE STUDY ON LONGWALL MINING
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 …
Design of Barrier Pillar for Highwall Stability in Punch Longwall
Punch longwall mining technique is a highly economical method of extracting coal deposit existing beyond the critical depth of open pit mine. As the entries to longwall project are driven and ...
Shortwall Mining | Introduction | underground COAL
Shortwall Mining. 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 ...
University of Wollongong Research Online
Abstract: 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 …
Longwall Mining Overview | Introduction | underground COAL
Overview. In the method of secondary extraction known as longwall mining a relatively long mining face (typically in the range 100 to 300m but may be longer) is created by driving a roadway at right angles between two roadways that form the sides of the longwall block, with one rib of this new roadway forming the longwall face.
Advancing and Retreating Longwalls | Introduction
punch longwall mining ; shortwall mining; alternative shortwall mining method - gretley colliery; longwall top coal caving ; ventilation. main fans ; main airways ; secondary or panel airways ; ... longwall mining : advancing and retreating longwalls : Advancing and Retreating Longwalls.
OneMine | Longwall Punch Mining form Open Cut Highwalls
Rapid access longwall mining' or 'longwail punch mining' is a proposed extraction method whereby longwall gate roads are driven into a seam directly from an opencut highwall. The longwall panel thus formed is retreated back to within 40 m of the highwall providing an extremely simple, reliable and therefore highly productive …
Punch Longwall Mining | Introduction | underground COAL
longwall mining. overview ; advancing and retreating longwalls ; equipment ; cutting processes ; ventilation/gas control ; stress/strata control ; installation/relocation ; …
Longwall Punch Mining form Open Cut Highwalls
Rapid access longwall mining' or 'longwail punch mining' is a proposed extraction method whereby longwall gate roads are driven into a seam directly from an opencut highwall. The longwall panel thus formed is retreated back to within 40 m of the highwall providing an extremely simple, reliable and therefore highly productive longwall mining …
A new automated, safe, environmentally sustainable, and …
highwall mining equipment was used to develop punch longwall gates. The procedure was first to cut a 3.5 m wide entry and ... advantages – pillars can be undesirable as they become stress concentrators, which can lead to falls of ground ... of an equivalent longwall operation. Mining method outline – safe highwall underground remote mining ...
(PDF) A new automated, safe, environmentally sustainable, and …
The method is more flexible than longwall mining and the percentage extraction would seem to be in the same range. In addition because of the backfilling, surface subsidence would not be a major ...
(PDF) LONGWALL MINING SYNOPSIS
In principle, longwall mining is quite simple a coalbed is blocked out into a panel a veraging. nearly 800 f t (244m) in width, 7000 feet (2100 m) in length, and 7 feet (2.1m) in height, by ...
Highwall stability in longwall mining
of only a few punch longwall mines in Australia. This method makes use of abandoned open cut mine strips and drives gateroads directly into the seam at the base of the highwall, with no requirement for main entries. The longwall is then retreated towards the open cut and recovered just short of the highwall, leaving a safe barrier pillar.
THE TRADITIONAL WONGAWILLI METHOD – Mining …
The method provides; a) A straight goaf line. b) Simple ventilation system, with air being coursed via the goaf, and. c) Working within destressed areas. The key to its success was working within, and using destressed areas to the full advantage. It has been possible to use this method at depths of up to 600 meters.
Effect of Punch Longwall Mining on Highwall Stability
• Radar monitoring when longwall is within 200m of the final position; • Respective movement trigger rates of 1.5mm/ 2 hours and 2.0mm/ 2 hours over two radar scans …
Research on an Intelligent Mining Complete System of a …
seam underground mining and the disorders in the mining machines used in the methods of Highwall, Auger, and Punch longwall mining, along with their types and variations. The article proposed a constructive technical solution to increase the contact adaptivity of the mechanical roof support. The developed solution of the mechanized …
punch longwall mining method advantages
Key words: Punch multi-slice longwall mining, thick coal seam, weak strata, stability of highwall. 1. Introduction The surface mining method is generally considered to be more advantageous than the underground method, especially in recovery, grade control, production capacity, economics, flexibility, safety and working environments.
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 …
Punch: Simple, productive, cost effective
BMA concluded following an exhaustive process, the punch longwall layout was proven to be the preferred and optimum layout that would provide greatest …
Longwall mining
Energy. Longwall mining is a form of underground coal mining where a long wall of coal is mined in a single slice (typically 1-2 m thick). The longwall "panel" (the block of coal that is being mined) is typically 3-4 km long and 250-400 m wide. Longwall mining produced 176 million tons of coal in 2007, about 15 percent of total U.S. production.
LONGWALL MINING TECHNOLOGY | PPT
LONGWALL MINING TECHNOLOGY. 1. LONGWALL MINING Venkat. 2. COAL - Background. 3. COAL Most abundant fossil fuel Major fuel used for electricity generation world wide Safe and secure fossil fuel Cost effective. 4. WORLD ELECTRICITY GENERATION (% By Fuel-2005) Consumption by India World Fuel (%) (%) Oil 32 37 …
LONGWALL RETREAT MINING – Mining Science and …
The predominant method of longwall mining in Australia is longwall retreat system. In retreat longwall mining, two sets of entries are driven between 100 to 250m apart. When the entries have been driven a predetermined length, say two kilometres, they are connected and a rectangular longwall block is outlined. The longwall face is then ...
Longwall 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 referred to as a panel (of solid coal).
PUNCH LONGWALL MINING – Mining Science and …
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 open cut operation.
