A wall of coal that's being worked or being prepared to work is a coal wall face.
small pieces of coal are called slack. Thank you!
A coal seam
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.
A coal mine is typically referred to as a coal mine.
Excavated coal is commonly referred to as "mined coal."
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Metamorphosed coal is called Anthracite.
coal ship
Coal that is still in the ground is referred to as coal seam or coal deposit.
Small lumps of coal can be referred to as "coal nuggets" or "coal chunks."
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Machines load coal onto from a coal mine onto a conveyor belt. Most often, this is a longwall machine, which has drums that shear from the coal wall face, and automatically load the coal onto a conveyor.