Manhole
A cubby hole inset in the side of a haulage passage such
as the main slope or level, for personnel to stand in
safety when coal boxes pass. |
Manway
A passage in or into the mine used as a foot path. |
Manager
The official in charge of a mine, surface and underground. |
Medium-Volatile
Bituminous Coal
A non-binding bituminous coal with 69-78% fixed carbon
and 22-31% volatile matter. |
Meta-Anthracite
Coal
A non-binding anthracite coal that has 98% or more fixed
carbon, and 2% or less volatile matter. |
Metamorphism
The mineralogical and structural adjustment of solid rocks
to physical and chemical conditions that have been imposed
at depth below surface. |
Miner
Technically a workman engaged in extracting coal at the
coal face, but generally used to describe anyone who works
underground. |
Mouth
The opening at the surface of any passage into a mine. |
