Natural ventilation - Ventilation of a mine without the aid of fans or furnaces.
Nip - Device at the end of the trailing cable of a mining machine used for connecting the trailing cable to the trolley wire and ground.
Open end pillaring - A method of mining pillars in which no stump is left; the pockets driven are open on the gob side and the roof is supported by timber.
Outby; outbye - Nearer to the shaft, and hence farther from the working face. Toward the mine entrance. The opposite of inby.
Outcrop – Coal that appears at or near the surface.
Overburden – Layers of soil and rock covering a coal seam. Overburden is removed prior to surface mining and replaced after the coal is taken from the seam.
Overcast (undercast) - Enclosed airway which permits one air current to pass over (under) another without interruption.
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