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effect of stripping ratio in coal mining

  • Glossary of Mining Terms

    A Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back abutment, that is, the settled packs behind the face.

  • Surface mining planning and design of open pit mining

     · Surface mining planning and design of open pit mining 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.

  • mining engineering: April 2010


  • break-even stripping ratio | Britannica

     · In coal mining: Contour strip miningIf the break-even stripping ratio remains favourable, further cuts into the hillside will be made. Otherwise, if there are sufficient reserves under the knob of the hill, the coal may be recovered by underground mining or by augering.

  • (PDF) Stripping Ratios, Pit Limits & Cutoff Grade Optimization …

    A review of cut-off grade policy models for open pit mining operations By Iván Cárcamo Optimum cut-off grade''s calculation in open pit mines with regard to reducing the undesirable environmental impacts

  • Stripping Ratios: What are They and Why are They Important?

     · Stripping ratios aren''t often discussed, but they can be an early and important indicator for mining projects. Here''s what investors should know about them. A strip ratio, or stripping ratio ...

  • Increasing Operational Efficiency in Mining

     · With a stripping ratio of 10 that results in an additional 80,000 tons of coal every year just by simply combining essential processes. And that is just for 1 shovel! It is also possible to combine the lunch breaks and refueling the dump trucks with the lunch of the excavator which they are servicing since as a rule their refueling does not require the driver''s participation.

  • Toward Pillar Design to Prevent Collapse of Room-and-Pillar Mines

    extraction ratio will put pillar stress close to peak strength and provide ample expansion room for the failed pillar material. (2) Width-height ratios of pillars are always less than 3 for coal mine failures, usually much less than 1 in metal-mine failures, and less than

  • Coal mining

     · Coal mining. This article is part of the Global Coal Mine Tracker, a project of Global Energy Monitor. Coal mining is the process of extracting a coal reserve from the ground. As a commodity, coal is valued for its energy content and since the nineteenth century has been widely used to generate electricity and as a fuel source for the steel and ...


    w/h ratio under simulated strong mine roof and floor conditions (figure 1). Confinement generated by the frictional effect at coal-rock interfaces was demonstrated to accelerate pillar strength increase beginning at a w/h ratio of about 3. There-after, frictional

  • Stripping ratio

    Standard stripping ratio - the ratio of "overbudern (OB) to be removed" to "the mineral to be produced" during the whole project life. Suppose in an opencast mine, 20 lakh CuM OB will be removed during the life time (suppose 15 years) against the production of 10 lakh Te of coal, the standard stripping ratio will be 2.1

  • Rational economic stripping ratios: International Journal of Surface Mining…

     · ABSTRACT: The economic stripping ratio used to define an economic mining block in an open pit coal mining situation is rationalised by considering the time value of money, and defining run of mine recovery and mining cost as dynamic variables dictated by the ...

  • (PDF) Surface Mine Design

    It should be noted here that a stripping ratio of 2 to1 means t hat there is twice as much waste rock mined as mineral (ore, coal, etc.). Two types of methods may be used in surface mining ...

  • In coal mining what is a good strip ratio?

     · To surface mine we need to remove some waste in addition to ore / coalc. SR measures how much waste needs to be removed so that a unit of ore/coal can be mined* This means "relative depth"source ...

  • effect of stripping ratio in coal mining

    effect of stripping ratio in coal mining Solution for Aug 31, 2012 Switch to underground mining if your stripping ratio is more than BESR. Environmental impact of the coal industry Wikipedia, the free This process is known as acid rock drainage or acid mine drainage.

  • Effect of fly ash on geotechnical properties and stability of coal mine …

     · The present paper reviews the effect of fly ash on the different geotechnical properties and stability of coal mine OB dump material to explore a safe and effective utilization of fly ash. It was found that up to 30% fly ash can potentially modify the compaction characteristics, California bearing ratio value, unconfined compressive strength, and shear …

  • what is stripping ratio coal mining

    stripping ratio mining Britannica Other articles where stripping ratio is discussed: coal mining: Choosing a mining method: calculated with the aid of stripping ratios, which represent the amount of waste material that must be removed to extract a given amount of ...

  • Coal Ratio

    With increasing overburden to coal ratio, the cost of removal of overburden (known as stripping cost) adds considerably to the cost of mining the coal beyond economic limit. To develop a mine, the break even stripping ratio (at the surface of the final pit) must be established.

  • Coal Surface Mining

    Surface Mining is a form of mining for ore material on the surface layer of the Earth''s crust. This method is famous with coal mining. I will be sharing the general steps that are present in this method. 1.Removing the trees and vegetation present in the area. 2.Removing the top layer of the Earth and storing it .

  • Productivity in the Mining Industry: Measurement and Interpretation …

    A.2 Coal mining: Inputs, outputs and MFP 115 A.3 Coal mining MFP: Impact of resource depletion and capital effects 116 A.4 Ratio of coal to overburden production, 1991-92 to 2006-07 116 A.5 Coal mining: Contributions to MFP changes, 2000-01 to 2006

  • (PDF) Surface Mine Design

    SURFACE MINE DESIGN 1. Izhar Mithal Jiskani. BACKG ROUND. The method of mining is unique for each different size and each shape of the ore body. Mineral deposits differ in …

  • CDC

     · Highwall mining has become a widely applied method in surface mining. It is commonly used alone or in conjunction with contour or slot mining. It provides 800 to 1,200 ft of additional recovery when, in contour mining, the economic stripping ratio is reached or, in slot mining, when surface access to a reserve is limited.

  • Prepared by

    Out of this coal bearing area, active coal mining area is about 2500 sq. km. Maximum land degradation in coal mining is caused by open-cast mining and it is currently confined to 20% of the coal bearing land.

  • Stripping ratio and pit limit

     · Stripping ratio is expressed broadly as the ratio of waste to ore. It''s simply calculating how much waste has to be removed to expose how much of ore to be mined. Stripping ratio determines where the pit limit will be. There are basically three (3) forms of stripping ratios. The overall stripping ratio (average stripping ratio), the maximum ...

  • effect of stripping ratio in coal mining

    influence of striping ratio on open cast coal mining effect of stripping ratio in coal mining PRODCUT Industry News determine industrial processing of iron ore crushing of iron ore affect of Get a Price Coal mining Wikipedia Coal mining is the process of extracting ...

  • Analysis of Highwall Mining Stability

    highwall mining may account for around 45 million tons of clean coal production representing about 4% of the U.S. total production. In addition to being a very productive and economic coal production method, analysis shows that auger and highwall mining 6

  • Research on the mining method and stripping ratio of steep end …

    Mathematic models of mining stripping ratio and coal seam thickness, fault angle and fault throw are built to analyze the impact of different unexploited coal pillar widths on …

  • Stability Evaluation of Highwall Slope in an Opencast Coal Mine-A …

    The opencast mining accounts for about 95% of total coal production in India (DGMS Report, 2016). This has resulted in the opencast mines going deeper day by day with the maximum stripping ratio being planned currently looking upto 1:15, at a depth of

  • Optimal Design of Mining Panels for Truck Shovel Operations in …

     · Optimal Design of Mining Panels for Truck Shovel Operations in Large Open Pit. In the planning phase, the entire surface area is usually divided into mining panels which are later mined and reclaimed with a particular sequence. Panel dimensions and their relative orientations affect in-pit waste haulage distance, stripping ratio, production ...

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