a. The surface outlet of an underground conduit, as of a volcano. AGI
b. The collar of a borehole. Long
c. An opening resembling or likened to a mouth, such as one affording entrance or exit. Webster 2nd
d. The entrance to a mine. BCI
e. The top of a mine shaft or the point of entrance to a slant, drift, or adit. Nelson
f. The end of a shaft, adit, drift, entry, tunnel, etc., emerging at the surface. Fay
g. The opening in a metallurgical furnace through which it is charged; also, the taphole. Fay
h. The place of discharge of a stream, as where it enters a larger stream, a lake, or the sea. AGI
i. The entrance or opening of a geomorphic feature, such as a cave, valley, or canyon. AGI
Source: Dictionary of Mining, Mineral, and Related Terms










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