Reclamation is generally concurrent with mining. Strip mining is commonly used for mining coal seams and phosphate beds. In hilly terrain the mining of the overburden and the deposit …

1- Contour Mining: Contour Mining is most commonly used in areas that have steep or rolling terrain. It involves digging the earth above the coal line, or coal seam, along the contours of …

Strip mining: Strip mining, also called contour or area mining, is a type of surface mining wherein the overburden is removed from the coal deposit in roughly rectangular strips that vary in size depending on the size of the mining operation. ... Draglines: Draglines are a type of equipment used during surface mining to remove overburden from ...

Contour strip mining and area strip mining are the two forms of strip mining, which is often used to extract coal and lignite. Strip mining is feasible only when the ore deposits are located near the surface of the ore body. In contour strip mining, bulldozers or power shovels are deployed to take away huge amounts of ground material in ...

Opencast mining is also known as open-put mining, open-cut mining, surface mining and also as strip mining, the later term being commonly used in the U.S.A. for opencast mining of coal. The overburden and the mineral, coal, are excavated in long strips of a few metres thickness and hence the operations are termed strip mining.

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 ...

- more consistent flow of coal production - if breakdown in equipment, can combine into one face ... - 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 roof, geology, and equipment used - Recovery can vary from ...

Surface mining for coal is done almost exclusively by auger mining, and area and contour strip mining. Area strip mining usually is practiced on relatively flat terrain. A trench, or "box cut," is made through the overburden. 0 . to expose a portion of the coal seam, which is then removed. As this trench is

Reclamation is generally concurrent with mining. Strip mining is commonly used for mining coal seams and phosphate beds. In hilly terrain the mining of the overburden and the deposit (usually a coal seam) follows the contour around the hill and into the hillside up to the economic limits; hence it is called contour mining.

There are two main forms of strip mining. which include: Area Mining; ... Cuttings are made on the slope or angle where the coal seam is located during contour mining, first removing the overburden and subsequently the coal itself. ... Only when the ore body needs to be dug up is it feasible to use strip mining. Some of the largest equipment on ...

When the coal is depleated by contour mining, Augers are usually used to bore holes into the outcrop of the coal seam to extract more coal. Then the holes are filled, the contour bench is …

STRIP MINING OF COAL: A FEDERAL RESPONSE TO STATE LEGISLATION. There are three methods of surface or strip mining,' each developed for a particular type of landscape, area stripping, contour stripping and auger stripping. 2 . During the past thirty years, the amount of coal pro-duced by strip mining has quadrupled.'

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 …

In contour or area stripping, the overburden is hauled with different equipment than what digs or removes the overburden. In strip mining, the overburden is mined and moved by the same equipment: draglines or continuous excavators. The movement of overburden in strip mining is called the casting process.

Contour Strip Mining. -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. Phases of Contour Mining. • Removal of top soil.

Jan 25, 2018· Contour strip mining and area strip mining are the two forms of strip mining, which is often used to extract coal and lignite. In contour strip mining, bulldozers or power …

Terms in this set (6) Surface mining. Shallow deposits. - equipment removes soil and rock on top and dispose is it as waste product called spoils. - this provides 90% nonfuel minerals and 60% coal. Area strip mining. Huge earth strips of overburden soil or removed, power shovel removes the hole and the area is covered with the overburden - move ...

Contour mining methods evolved to allow the economic extraction of coal using smaller and more agile equipment with more flexible mining patterns. As with area mining, it …

Contour strip mining is used mostly to mine coal on hilly or mountainous terrain from BIOTECHNOL 101 at International University in Germany. Study Resources. Main Menu; by School; by Literature Title; by Subject; Textbook Solutions Expert Tutors Earn. Main Menu; Earn Free Access; ... Contour strip mining is used mostly to mine coal on hilly or ...

Releases methane in the atmosphere: Methane released in the atmosphere when we excavate the coal from deeper coal mines which considered as one of the best resources …