Broadmeadow mine prepares the highwall for long term stability after open cast mining is completed. Slope and batter angles, bench configuration and pre-spilt blasts for the final strip are all designed with the punch longwall end use in mind. The bottom section of the highwall is the scaled to clean the highwall of any loose material.
Abstract - The so - called "Longwall Mining System" have been effectively applied for 60-70 years in coal mining practice in USA, Australia and the Germany. In general, those are the systems of underground coal mining with mine ... Adriyala Mine is accessed by four Punch entries and one shaft. Two main fans of 400kw
mechanized longwall mining system during the subsidence of roof rocks [28]. Wu [29] ... 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 support section is
The number one issue affecting the future of longwall mining is, therefore, continuous miner development. Many of the changes and improvements to the longwall mining system are driven by the desire to minimize the amount of development area required. Stated another way, the focus has been to maximize the ratio of longwall to …
In the longwall system the ore body is divided into rectangular panels or blocks. In each panel two or more parallel drifts (for ventilation and ore transport) are driven along the opposite long sides to provide access, and at the end of the…. The other principal method of modern mining, longwall mining, had been introduced as early as the ...
At South Blackwater Mine in 2000 (ACARP, 2000) highwall mining equipment was used to develop punch longwall gates. The procedure was first to cut a 3.5 m wide entry and then increase it to the final width of 5.2 m in a second pass.
2.1 Longwall system. In India, the first mechanized longwall mining was implemented in Moonidh in 1978. Longwall mining is a new era in underground coal mining across the globe. This method can be adopted even in weak roof strata conditions with the help of an armoured face conveyor (AFC). Gassy seams are also easier to work …
Longwall mining systems are capable of producing significant outputs from a single longwall face – 8 million tones per annum or more. When operating correctly the coal is mined in a systematic, relatively continuous and repetitive process which is ideal for strata control and for associated mining operations. There is a high capital cost for ...
The study area of this research is PT Gerbang Daya Mandiri (GDM) mine which is situated in East Kalimantan. Stratigraphy of this area comprises of claystone as dominant rock and multiple coal seams with the thickness ranging from 0.15 m to 9.8 m. In this mine, the longwall mining method attempts to be applied for coal seam extraction.
The punch longwall mining system for open cut mining helps in coal recovery and in understanding of the underground mining in Indonesia but due to high cost associated with it and the geological ...
But simply mining the parts of a seam that a standard longwall system can reach is wasteful and inefficient — not to mention risky, as leaving the seam partially mined can cause geological issues later in the mining process. ... Broadmeadows uses the punch longwall mining method, accessing coal seams directly from the pit created by the ...
Request PDF | On Feb 28, 2015, Takashi Sasaoka and others published Punch Multi-slice Longwall Mining System for Thick Coal Seam under Weak Geological Conditions | Find, read and cite all the ...
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Ausimm Illawarra Branch. Editor: Naj I. AzizAugust 1986 . The Problem of Strong Roof Beds and Water Bearing Strata in the Control of Longwall Faces – A.H. WILSON. Page 1 The Effects of Mining on the Geological Equilibrium at Leichardt Colliery, Blackwater, Queensland– J. Hanes. Page 9 Geological Conditions and Applied Geomechanics at …
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 …
Longwall mining is an efficient mining method and using the right equipment can make it even more profitable. Joy longwall systems incorporate shearers, roof supports, face conveyors and more into one …
Longwall Punch Mining form Open Cut Highwalls. Rapid access longwall mining' or 'longwail punch mining' is a proposed extraction method whereby longwall gate roads …
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 ...
Highwall mining systems can be used to recover this coal. The use of highwall mining systems has increasingly come into play in the US and Australia. ... Michell G (1999) Benefits of longwall punch mining. Proceedings of the 2nd annual longwall mining summit, p 8. Robertson BN, O'Regan G, McKew M (1988) Longwall punch …
Punch Multi-slice Longwall Mining System for Thick Coal Seam under Weak Geological Conditions
A major investment in a new $40 million high-capacity longwall system will enable the mine to widen the longwall face from 200 to 320 metres and enhance Broadmeadow and BHP Billiton Mitsubishi Alliance's competitiveness in the international coking coal market. ... punch longwall mining requires a ventilation fan with a very wide …
Longwall mining is the most common of the underground coal mining methods used in Australia. It suits sites where coal seams are thicker, wide and have a consistent coal profile with gentle dip. In …
Longwall advance mining. There are two methods used to cut a web of coal from the longwall face. The "Bi-Directional" (bi-di) method. The shearer cuts a fresh web of coal each time it traverses up and down the coal face. The "Uni-Directional" (uni-di) method. The shearer cuts a web of coal from one side of the face to the other and then ...
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 system.
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 …
Longwall mining is a highly productive underground coal mining technique. Longwall mining machines consist of multiple coal shearers mounted on a series of self-advancing hydraulic ceiling supports. The entire process is …
The present research primarily focuses on the investigation of gate-entry stability of longwall trial panel under weak geological condition in Indonesia coal mine by means of numerical analysis. This work aims at identifying appropriate roof support at 100 m and 150 m of depth during gate development. Due to depth depending competency of …
THE MODERN WONGAWILLI METHOD. The Wongawilli system involves much larger blocks of up to 200 m wide. It consists of a 2 or 3 heading entry headings driven through the centre of the panels, splitting the panel into two smaller panels. The panel can be up to 1000 m long. Lifting of the fenders is carried out to the left and right of the split.
Abstract. The Punch Mining System serves the requirement to mine underground mineral deposits in a way of cutting short straight distances (punches) into the deposits (see Fig. 2), taking only a ...
From these backgrounds, this paper proposed a punch multi-slice mining system with stowing for thick coal seam under weak geological conditions and …
The punch board and pillar mining systems is best for Indonesian coal mines because it exhibit some of the properties including drilling and blasting, continuous or roadheader cutting, pillar ...
