Coal is also mined by underground mining, but only a portion of the coal present can be removed (holds up the roof). Coal is also mined by high wall or long wall mining, and by using large diameter augers to dig laterally into exposed seams.
the answer is coal
Coal
the answer is coal
By Mining
Coal is obtained by strip mining which removes all soil above a coal deposit. The soil is replaced but it takes many years for the ecosystem to recover and there are four ranks of coal which are:lignitesub-bituminousbituminousanthracite
under ground by mining
There are five main types of coal mining; shaft, strip, slope, surface, and draft.
Strip mining has long been associated with coal mines, has sometimes been used for copper and gold mines, and is currently in use for mining the Athabasca Tar Sands.
coal
coal
coal
Luis A. Fuste has written: 'Effects of coal strip mining on stream water quality and biology, southwestern Washington' -- subject(s): Coal mines and mining, Environmental aspects, Environmental aspects of Coal mines and mining, Environmental aspects of Strip mining, Strip mining, Water quality, Water quality bioassay