strip mining seams

  • 14.3 Open Cast (Strip) Mining - 1of 2 - We are Miner's.

    open cast or strip (furrow) mining. It is frequently practiced on a large scale, which results in low unit cost, high productivity, high recovery, and greater safety compared to underground min-ing. Contour (or collar) mining progresses in a narrow zone following the outcrop of a coal seam in mountainous terrain.

  • Strip Mining: Kentucky Begins Close the Reclamation Gap

    Strip Mining: KentuckyBegins To Close the Reclamation Gap Strip mining for coal creates such a blot on any landscape that it is hard to take the unemotional view. But it is worth making an attempt to do just that, since the controversy over the control of strip mining has recently taken on sharpened economic and polit-ical dimensions.

  • Coal mining - Wikipedia

    When coal seams are near the surface, it may be economical to extract the coal using open cut (also referred to as open cast, open pit, mountaintop removal or strip) mining methods. Opencast coal mining recovers a greater proportion of the coal deposit than underground methods, as more of the coal seams in the strata may be exploited. This equipment can include the following: Draglines which ...

  • Coal in Pennsylvania

    coal-mining operations has caused extensive pollution of streams and loss of fish and other wildlife. Mining also results in disruption of groundwater resources, soil erosion, and scarring of the land. Abandoned piles of waste material left behind from coal mining and coal processing blight many

  • Montana's Earth Science Picture of the Week

    Strip mining can be used in this area because the coal seams are closer to the surface than seams located in the eastern United States where underground coal mines are more common. Strip mining is much safer because miners do not have to go underground where collapses, gas explosions, and lung diseases are risks. The 1970's brought changes . . .

  • Open Pit Mining - an overview | ScienceDirect Topics

    Strip mining is the process of mining a seam of mineral by removing a long strip of overlying soil and rock. Strip mining is a practical type of mining when the ore body that is to be extracted is near the surface. Open-pit mining is the process of extracting rock or minerals from the earth through their removal from an open pit or borrow.

  • Coal mining - Choosing a mining method | Britannica

    Coal mining - Coal mining - Choosing a mining method: The various methods of mining a coal seam can be classified under two headings, surface mining and underground mining. Surface and underground coal mining are broad activities that incorporate numerous variations in equipment and methods, and the choice of which method to use in extracting a coal seam depends on many .

  • Glossary of Mining Terms

    Abutment - In coal mining, (1) ... angle is assumed to bisect the angle between the vertical and the angle of repose of the material and is 20° for flat seams. For dipping seams, the angle of break increases, being 35.8° from the vertical for a 40° dip. ... Cast - A directed throw; in strip-mining, the overburden is cast from the coal to the ...

  • Appalachia comes up small in era of giant coal mines ...

    Appalachia comes up small in era of giant coal mines ... coal seams as thick as 70 feet or more. ... The key piece of equipment in strip mining is a mobile dragline excavator, which scrapes away ...

  • Contour Mining Flashcards | Quizlet

    -used in areas where a coal seam outcrops on the side of a hill, but the economics do not permit the complete removal of the overburden-Mining proceeds along the outcrop in a strip or series of strips until the economic limit of stripping is reached

  • Colliery: How Coal Mining Works?

    Strip mining and mountaintop removal are two popular surface mining strategies when coal seams are located close to the surface of the earth. Strip Mining. In strip mining, the first step is to strip off the vegetation and soil in the vicinity of the surface to be mined for coal. The large intermediate layer of sediment and rock, i.e., the ...

  • Strip Mining - an overview | ScienceDirect Topics

    Another factor that is considered when determining the economics of strip mining is the stripping ratio, which is the ratio of overburden thickness to coal seam thickness. Typically, the maximum stripping ratio that is economical is 20 to 1 [4]. The two general methods of strip mining are area mining and contour mining.

  • Coal Contour Surface "Strip" Mining - Mine Engineer.Com

    Coal Contour Surface "Strip" Mining . ... where it is not feasible to extract the entire seam, using mountain top removal mining. Contour mining allows for the partial removal of the coal seam at the elevation of the coal seam. Quite often, contour mining is .

  • Chapter 2: The Environmental Effects of Strip Mining - The ...

    All surface or strip mining first removes the overlying vegetation, soil and underground rock layers in order to expose and extract coal from an underground seam or coal deposit. Responsible surface mining attempts to limit the side effects of this removal through several basic steps:

  • Surface Mining Product Demo - YouTube

    Jul 17, 2014 · As part of Mining Forum 2014, hosted several demonstrations of the mining product line for customers from around the world .

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  • STRIP MINING - Coal Sales Online

    Strip mining is accomplished by two techniques; area stripping and contour stripping. Where coal seams are relatively flat and near the surface. In area strip mining, the overlying material is removed from the seams of coal. Area strip mining is removed in long narrow bands, or .

  • 14.3 Open Cast (Strip) Mining - 1of 2 - We are Miner's.

    open cast or strip (furrow) mining. It is frequently practiced on a large scale, which results in low unit cost, high productivity, high recovery, and greater safety compared to underground min-ing. Contour (or collar) mining progresses in a narrow zone following the outcrop of a coal seam in mountainous terrain.

  • Colliery: How Coal Mining Works?