Menu
Mobile crushers can also be called mobile crushing plants, mobile crushers, etc. It is an inevitable product of high-tech crushing technology in the new era, and its main features are that it can be operated mobilely, can walk freely, and is more convenient for transitions, ensuring that the equipment While the production is safe, the work process is more reliable.
·It has been noted in recent years that the pillars in some bord and pillar workings scale or spall In due course this process may result in the collapse of the affected panels This paper presents a methodology for assessing the long term behaviour of such workings employing a simple model of pillar deterioration by scaling
·opencast pillar mining in previously mined underground bord and pillar workings by Ngwenyama1 and de Graaf1 Synopsis South Africa is one of the leading producers and exporters of coal globally A significant amount of the country s production is obtained from previously mined underground bord and pillar workings This
· Hill 2000 are applied to the underground bord and pillar coal mining process it becomes clear that the bord and pillar process can be categorized as a typical batch process As part of the bord and pillar batch process the product flow originates at a primary production machine called a continuous miner or CM This machine cuts tunnels
·The importance of coal in the energy sector and the ambitious target set for coal production is very high This paper deals with the use of continuous miner and its success in bord & pillar
·well Production well 1 Introduction Underground coal mining is done by bord and pillar longwall shortwall and underground coal gasification methods Bord and Pillar method Bord and Pillar method by which the coal seam is extracted by making intersecting headings that provide coal pillars as a
·The success of mechanized bord and pillar mining in narrow tabular steep dipping orebodies will depend on the extent of the research and development efforts which need to create and innovate
·For effectiveness in mining different methods have been approached keeping in mind the production and safety One of such methods is the Bord and Pillar method of mining Bord and Pillar method
·Bord and pillar in India adopted induced caving of roof coal band for single lift depillaring of total thickness SLDTT of a competent thick coal seam developed along floor
·The mine has a production target of 20 m³/h of copper Sandvik will demonstrate how this production target will be met using all the mining geological and machine parameters T1 Application of softrock mining equipment for hard rock mining in a Bord and Pillar operation at KGHM AU Leitner Alois N1 embargoed until null
·production rates and demand from the power station Three seams are being mined; the no 4 lower seam S4L no 2 seam S2 and the no 1 seam S1 The S4L and S1 are virgin coal seams while the S2 resources consist of pillar coal remaining from a previous bord and pillar operation that reached its end of life in the 1980s The underground mine
·To achieve the mass production in bord and pillar mining the implementation of continuous miner is necessary The continuous miner used to cut the coal and transferred to the shuttle car to unload Bord and pillar mining The following methods are commonly used in bord and pillar method for development and depillaring using continuous miner
·It reopened as a bord and pillar operation less than a year later What developed was one of the most economical mines in Australia Clarence has consistently increased production from a level of million tonnes in 1999 2000 to in 2003 04 Budgeted production for 2004 05 has been set at
A pre folded energy absorbing device which is the key device of energy absorption anti impact for roadway support is tested by quasi static compression and simulated
·The bord and pillar method is commonly employed in Indian underground coal mines and the extraction rate varies between 30 and 65% During pillar extraction pillars are subjected to severe stress conditions Due to this the natural state of stress equilibrium is disturbed resulting in severe strata control problems leading to sudden unpredictable failure
·ABSTRACT Barrier pillars are designed to isolate production sections from one another so that uncontrolled failure of pillars in one section will not affect the adjacent workings The strength of a continuous barrier pillar and the load which it carries are required for the design of barrier pillars The loading conditions were determined by assuming a simple model of the
·This paper is a case study of a large scale pillar collapse at the Everest Platinum Mine A major contributing factor to the collapse was the presence of weak alteration layers in the pillars
A significant amount of the country s production is obtained from previously mined underground bord and pillar workings This coal is in the form of pillars and remnants on the roof and floor of the old workings The good quality coal pillars were left behind as primary support during underground bord and pillar mining operations
·Once the deposit has been fully mined perhaps the most common option is "retreat mining " This method has been criticized in recent years because it s extremely risky both to workers and local This technique involves strategically removing the remaining pillars causing the roof to collapse and the productive area to be filled in by the overburden
This diagram shows the traditional method of bord and pillar mining Miners extracted coal along roadways or bords with the coal between the bords acting as pillars holding up the roof The outer pillars were then mined leaving the roof to collapse in a controlled way as the miners retreated towards the exit
·This paper addresses the critical parameters that need to be considered when designing a mechanized bord and pillar mining layout for a narrow tabular steep dipping orebody These parameters are Reef dip Reef width Geological structures within the orebody Physical dimensions of the selection of machines Gradeability of the selection of machines
·Extraction of coal by bord and pillar mining method poses many challenges with respect to the problem of strata control at higher depth A depillaring panel at deep cover greater than 525 m is analysed the stability of pillar and rib using three dimensional numerical modelling From the numerical modelling it was found that ribs safety
Chikande et al 2022 created and implemented a ventilation on demand VOD system for the bord and pillar mining method at a platinum mine in Zimbabwe to reduce the usage of excess air in the
·Bord & Pillar B&P method of mining In fact B&P is the dominant underground mining method for coal in India Depillari ng of these deve loped thick co al seams is chal lenging
·production output in 2000 while in the USA this mining method contributed half of the total underground output in 2000 The remainder of the underground production in these countries comes from bord and pillar operations The longwalling technique has still only found limited success in South Africa for the reasons mentioned previously
·The only way to achieve this is to reduce production costs by improving productivity efficiency and the effectiveness of the equipment This paper aims to identify the various factors and problems affecting the productivity of underground coal mines adopting the bord and pillar method of mining and to propose suitable measures for improving them
different methods have been approached keeping in mind the production and safety One of such methods is the Bord and Pillar method of mining Bord and Pillar method of mining is one of the oldest methods The key to the successful Bord and Pillar mining is selecting the optimum pillar size If the pillars are too small the mine will collapse
