Coal is obtained mainly by mining it from underground or near-surface deposits using a mix of large machines, explosives, and transport systems that move the coal to processing plants or directly to users.

What coal actually is

Coal is a fossil fuel formed from ancient plants that were buried, compressed, and heated over millions of years in swampy environments.

Over time, pressure and heat turned that plant matter first into peat and then into different ranks of coal, such as lignite, bituminous, and anthracite, each with different carbon content and energy.

Two main ways we get coal

There are two big categories of coal mining: surface mining and underground mining.

  • Surface mining is used when coal is relatively close to the surface, often less than about 60 meters to 200 feet deep.
  • Underground mining is used when coal seams lie deeper and removing all the overlying rock would be too costly or damaging.

Surface mining: scraping it off

In surface mining, miners first remove soil and rock (called overburden) sitting on top of the coal seam.

Common surface methods include:

  • Open‑pit mining: Digging a large open hole and using draglines, power shovels, and big trucks to scoop out coal.
  • Strip mining: Stripping long bands of soil and rock, exposing the seam in strips, then removing the coal and backfilling earlier strips with overburden.
  • Contour/area strip mining: Used on hillsides or flat terrain, cutting terraces or large areas to reach the coal.
  • Mountaintop removal: Blasting off the top of mountains to access coal seams; the broken rock is dumped in nearby valleys.

After the coal is exposed, it is drilled or blasted, then loaded onto trucks or conveyors and sent to preparation plants or directly to power plants and other users.

Underground mining: going down to get it

When coal lies deep underground, shafts or inclined tunnels are built to reach the seam.

Two key underground methods are:

  • Room-and-pillar mining
    • Miners cut a network of “rooms” in the coal seam and leave pillars of coal behind to support the roof.
* Continuous miner machines often cut the coal, which is then loaded onto conveyors or shuttle cars.
  • Longwall mining
    • A longwall shearer with rotating drums moves along a long face of coal, slicing it off as hydraulic shields hold up the roof.
* As the machine advances, the roof behind is allowed to collapse in a controlled way while coal falls onto a conveyor.

After mining: cleaning and moving coal

Once mined, coal often goes through:

  • Washing and preparation
    • Coal is crushed and washed in a preparation plant to remove rock, soil, and other impurities, improving its quality and energy content.
  • Transportation
    • Conveyors move coal within the mine; trucks, trains, barges, and sometimes ships move it to power plants, steel mills, or export terminals.

Information gathered from public forums or data available on the internet and portrayed here.