Underholing. See [Bearing in.]
Upcast. An opening from a mine through which air is taken out.
Vein. Used (improperly) synonymously with seam, bed, or stratum.
Wagon. A mine car.
Waste. Gob; coal dirt.
Water level. An entrance into or passage in a mine, driven with just sufficient grade to carry off water.
White damp. Carbonic oxide.
Wings. See [Keeps.]
Work. To mine.
Working face. A face at which mining is being done.