a. A watertight dam containing some form of door or removable plate. See also: dam
b. A tight partition of wood, rock, and mud or concrete in mines for protection against gas, fire, and water.
c. A masonry diaphragm built across a subaqueous tunnel, where compressed air is used as a precaution, and to prevent the flooding of an entire tunnel in case of an accident. It is usually kept some distance in the rear of the working face and is provided with two air locks; one of them is an emergency lock near the roof. Stauffer
d. A stone, steel, wood, or concrete wall-like structure primarily designed to resist earth or water pressure, such as a retaining wall holding back the ground from sliding into a channel, or a partition preventing water from entering a working area in a mine. AGI
e. A timber chock in metal mines. Nelson
f. The end of a flume, whence water is carried in iron pipes to hydraulic workings.
g. A solid crib used to support a very heavy roof. See also: cog; chock.
h. A panel of brick of lesser cross-sectional thickness built into a wall for ease of replacement or for entrance to the walled chamber. AISI
Source:
Dictionary of Mining, Mineral, and Related Terms












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