a. The floor or footwall of an underground mine.
b. The landing of a shaft or slope.
c. See: gutter
d. To complete a borehole.
e. To construct the bottom of or for; said specif. of underdraining a level. Standard, 2
f. To strike bedrock or clay when sinking a shaft. Standard, 2
g. The landing at the bottom of the shaft or slope. Fay
h. The lowest point of mining operations. Fay
i. To underrun (as a gold deposit that is to be worked by the hydraulic method) with a level for drainage. Webster 3rd
j. Surface in a borehole parallel to the face of a drill bit. Long
k. A mass of impure metal formed below the matte, in matting metal ores.
l. The footwall of a metalliferous deposit. Nelson
m. Barren bedrock. Nelson
n. The rock formation below the alluvium on which the gold or tin wash dirt is met. Gordon
o. In gemstones, the pavilion.
p. Pennsylvania. The stratum, rock, or floor on which a coal seam lies. Standard, 2
q. To break the material and throw it clear from the bottom or toe of the borehole.
r. To place a drill bit in contact with the bottom of a borehole.
s. Surface in a borehole parallel to the face of a drill bit.
t. In metal-melting furnaces, this is usually the hearth or crucible. See also: bottoming
Source: Dictionary of Mining, Mineral, and Related Terms