a. The distance from the borehole and the nearest free face or distance between boreholes measured perpendicular to the spacing (usually perpendicular to the free face).
b. All types of rock or earthy materials overlying bedrock. See also: cover; mantle; overburden. Long
c. Valueless material overlying ore, esp. that removed by stripping. Frequently called overburden. Webster 2nd
d. The resistance that an explosive charge must overcome in breaking the rock adjacent to a drill hole in mining. Webster 3rd
e. The tonnage or cubic yards of rock, ore, or coal that an explosive charge is expected to break. Nelson
f. The distance between the charge and the free face of the material to be blasted. Fay
g. See: line of least resistance
h. The charge of a blast furnace exclusive of the fuel; also, the ratio of the ore to the total charge.
Source:
Dictionary of Mining, Mineral, and Related Terms












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