Methods Of Coal Mining

Methods Of Coal Mining

Surface mining is used for an estimated 40% of coal production. Used machinery equipment can be used to extract coal. Extracting coal is less expensive if it is found close to the surface. As soon as coal is extracted, the topsoil is then replaced and native trees and vegetation is planted to revive the original condition. There are three completely different types of surface mining: contour, strip, and mountaintop removal mining.

1- Contour Mining: Contour Mining is most commonly utilized in areas that have steep or rolling terrain. It involves digging the earth above the coal line, or coal seam, along the contours of the hilly terrain. This method can be dangerous because it could cause landslides and erosion problems.

2- Strip Mining: Strip Mining normally happens on flat terrain. The earth is dug up in lengthy cuts or strips until the coal seam is exposed. After the strip has been drilled and blasted and all of the coal has been eliminated, a new strip is created proper subsequent to it and the process continues.

3- Mountaintop Removal Mining: Mountaintop Removal Mining entails using a combination of Contour Mining and Strip Mining. The mountaintops are eliminated to show the coal beneath and the coal is extracted.

Belowground Mining Strategies

If the coal seams are too deep belowground, then deep beneathground mining is necessary. Deep underground mining methods include Steady, Longwall, Blast, Retreat Mining and Shortwall Mining.

o Steady Mining: A machine that has a large rotating metal drum with tungsten carbide teeth scrapes coal from the seam. Conveyors are used to transport the removed coal. About 5 tons of coal can be mined per minute. Accounts for about 45% of underneathground coal production.
o Longwall Mining: A sophisticated machine that has a rotating drum that mechanically strikes back and forth alongside the seam. Loosened coal falls on the pan line which takes the coal to the conveyor belt. Accounts for about 50% of coal production.

o Blast: An older mining technique that uses dynamite and explosives to interrupt away the coal seam. Accounts for less than 5% of coal production.
o Retreat Mining: One of the crucial dangerous Coal Sales & Consulting mining methods. Pillars are used to hold up the mine roof as coal is extracted. The pillars collapse as miners retreat.
o Shortwall Mining: Just like longwall mining. Uses a steady mining machine with moveable roof supports. The machine shears coal panels about 200 feet wide and half a mile long.

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