contour strip mining coal mining

Contour strip mining | coal mining | Britannica.com

Other articles where Contour strip mining is discussed: auger mining: Augering is usually associated with contour strip-mining, recovering coal for a limited depth beyond the point where stripping becomes uneconomical because the seam of coal lies so far beneath the surface.

Surface Mining Animation - YouTube

Jan 20, 2014· See what Vermeer surface mining equipment can do for you. - Patented tilting capability - Vertical wall capability - Mine in layers - Selective piling - Sele...

Strip Mining, Open-pit Mining, Surface Mining, Mining ...

Strip Mining. Strip mining is a kind of surface mining. The ore is very near to the surface of the land but has one or more layers of rock and filth on top of it. To mine the ore, these layers have to be removed. The steps in strip mining are similar to open-pit mining.

Basic Information about Surface Coal Mining in Appalachia ...

Layers of rock and dirt above and between the coal seams are removed. Coal seams are removed with excess soil and rock placed in an adjacent valley. Large scale earth moving equipment is used to excavate and remove coal from lower layers. The equipment used depends on the method and scale of the surface mining method being employed.

Coal mining | Wiki | Everipedia

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. Open cast 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.

Open-pit Mining, Opencast Mining, Open-cut Mining, Strip ...

Contour mining is associated with coal. This bed of coal is located at an elevation in a mountain range or any other hilly area. It is a method of strip or surface mining. It is also referred to as Bench mining. The coal is extracted from a mountainous area where it is not possible to extract the entire seam using mountain top removal mining.

Contour Mining - YouTube

Dec 08, 2015· www.ReddCamera.com Tallahassee Florida Video Production. This feature is not available right now. Please try again later.

CH 15 Flashcards | Quizlet

Type of surface mining that uses explosives, massive shovels, and even larger machinery called draglines to remove the top of a mountain to expose seams of coal underneath a mountain. Compare area strip mining, contour strip mining.

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.

Plundering Appalachia - The Tragedy of Mountaintop-Removal ...

Mountaintop removal is strip-mining on steroids. Massive dump trucks, huge bulldozers, and ten-story-high draglines can undo in months what geological processes took millions of years to build. Typically, multiple coal seams are exposed as a mountaintop-removal operation dismantles the …

Surface mining - Wikipedia

"Strip mining" is the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock (the overburden).It is most commonly used to mine coal and lignite (brown coal).Strip mining is only practical when the ore body to be excavated is relatively near the surface.

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

Coal Contour Surface "Strip" Mining . The Contour or Bench method of surface or strip mining is usually associated with coal, where a seam or multiple seams are located at a certain elevation or elevations through a mountain or hill.

Contour Surface Mining | West ia Coal Association

.2.b. Contour mining is practiced in areas where it is uneconomical to remove all the overburden from a coal seam or series of coal seams. In contour mining, surface mining machinery follows the contours of a coal seam or seams around a ridge excavating the overburden and recovering the coal seam or seams as a “contour bench” around the mountain is created.

Coal mining - Wikipedia

Mountaintop coal mining is a surface mining practice involving removal of mountaintops to expose coal seams, and disposing of associated mining overburden in adjacent "valley fills." Valley fills occur in steep terrain where there are limited disposal alternatives. Mountaintop removal combines area and contour strip mining methods. In areas ...

Contour Mining and Construction | General Contractor in ...

We are poised to forge a new standard in the mining and site development industries. Contour is headquartered in Columbia, South Carolina, and we are able to mobilize on any project in the Southeast. We are a licensed general contractor with unlimited status in South Carolina and North Carolina, and we are bonded for jobs in excess of $20,000,000.

More than half of the U.S. coal mines operating in 2008 ...

Contour strip mining accounted for more than half of the surface mine closures between 2008 and 2017. Open-pit coal mining is a combination of contour and area mining methods and is used to mine thick, steeply inclined coalbeds. In contrast to other forms of mining, open pit mines increased in number from 2008 to 2017, but production levels ...

(PDF) COAL MINING METHODS - researchgate.net

Contour strip mining is a method of surface mining or in which bulldozers, power shovels, or stripping wheels are used to remov e large chunks of earth in terraced strips in order to extract coal

5 Chief Pros and Cons of Strip Mining – ConnectUS

Sep 24, 2015· 5 Chief Pros and Cons of Strip Mining. Sep 24, 2015 Aug 29, 2015 by Crystal Ayres. Surface mining refers to a category of mining where soil and rock overlying the mineral deposit are removed. There are several types of surface mining, and strip mining counts as one of them. ... West ia were once booming coal mining towns. They were ...

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

EFFECTS OF. STRIP MINING ... An underground coal mine usually begins much like a contour mine, with a cut into the side of a hill. Indeed, many abandoned surface mines serve as the face for the underground mine. The bench created by the cut often houses the mine office and equipment storage. Several portals are usually dug into the coal seam at ...

What is Strip Mining? (with pictures) - wisegeek.com

Jul 12, 2019· In contour strip mining, strips are dug out around the contours of a mountain, and miners must be more careful to avoid collapses and other problems which can cause injuries or deaths. As one might imagine from the description, strip mining can be extremely disruptive.

Coal production using mountaintop removal mining decreases ...

In mountaintop removal, entire coal seams running through the upper portion of a mountain are mined by removing all of the overburden (rock or soil overlying a mineral deposit), creating a level plateau or gently rolling contour. This type of mining is sometimes considered a variation of contour mining.

SURFACE MINING | Coal Mining | The National Academies Press

Surface mining is classified as contour, area, open pit, and auger. Contour mining is used in hilly or mountainous areas (primarily in the East) where the coal is recovered from a narrow contour strip, 50 to 100 feet wide, that follows the coal seam around the irregular topogrphy.

Pros and Cons of Strip Mining | APECSEC.org

Feb 25, 2015· Pros and Cons of Strip Mining. Feb 25, 2015. 0. 27732. Share on Facebook. Tweet on Twitter. For those who are unfamiliar, strip mining is a form of surface mining that focuses on the collection of tar sand and coal, which both rest somewhat close to Earth’s surface. Those who support strip mining point to the increased ease of access and all ...

Contour Highwall Mining

Welcome to Contour Highwall Mining, LLC! Contour Highwall Mining, LLC (CHM) is a privately-held company headquartered in Summersville, West ia. The company has been highwall mining since 2000. CMH is affiliated with Bundy Auger Mining, Inc. which was started in 1985 and removes coal by the auger method under independent contract mining ...

Obama Ends 150-Year War of Strip-Mining in 24 States! | Grist

Apr 01, 2010· Obama Ends 150-Year War of Strip-Mining in 24 States: Mountaintop Removal Loses Its Groove. Yeah, I’ve been wanting to wake up to that headline for years, too. Instead, I read another Coal ...

What are main methods of surface mining? - Quora

Nov 09, 2017· Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed. In contrast to underground mining, in which th...

Images of Mountaintop Removal Mining | Earthjustice

Mountaintop removal coal mining, often described as "strip mining on steroids," is an extremely destructive form of mining that is devastating Appalachia. In just a few decades, more than 2,400 miles of streams and headwaters that provide drinking water for …

Chapter 2: The Environmental Effects of Strip Mining THE ...

The Mechanics of Strip Mining This section describes the five main types of surface coal mining techniques: area mining, open pit mining, contour mining, auger mining, and mountaintop removal. Underground mining is also considered in this section. Terrain, economics, and custom generally dictate which technique an operator chooses.

Contour Mining Flashcards | Quizlet

• supplementary coal extraction techniques most often used immediately following contour strip mining • Depth of penetration is dependent on the variability of seam thickness, quality of the roof, geology, and equipment used • Recovery can vary from 40 to 60 %

About Us | Contura Energy

With customers across the globe, high-quality reserves and significant port capacity, Contura Energy reliably supplies both metallurgical coal to produce steel and thermal coal to generate power. Contura Energy is committed to operating safely, efficiently, and responsibly, with customer service second-to-none and an ongoing focus on continuous ...