Definition of point

i. A predetermined direction for driving a roadway underground. The point is fixed by roof plugs in the roadway.

See Also: alignment, spad

Ref: Nelson

ii. One one-hundredth (0.01) part of a carat. When less than one carat, the weight of a diamond is usually expressed in points; e.g., 20 points equals 1/5 carat.

Ref: Chandler

iii. A pipe through which steam or hot water is brought into contact with frozen gravel to thaw it for mining or dredging.

iv. See: well point

v. In quarrying, a type of wedge that tapers to a narrow, thin edge.

vi. The end or bottom of a borehole, as distinguished from the mouth or collar.

Ref: Fay

vii. A tool used in trimming and smoothing rough stone surfaces.

Ref: Webster 3rd

viii. Either of a pair of tapered rails at a turnout that can be adjusted to direct a set of mine cars from a straight rail track to another track branching off at an angle.

See Also: catch point, turnout

Ref: Nelson