a. The part of an ore deposit that is too low in grade to be of economic value at the time of mining, but which may be stored separately for possible treatment later. Lewis
b. Refuse and impurities removed in mining and treating coal; also, the coal left in a mine as pillars.
c. Gangue.
d. Tailings.
e. Overburden.
f. The refuse from ore dressing and smelting plants. Gob; goaf; old workings; also, the fine coal made in mining and preparing coal for market; culm; coal dirt; also used to signify both the mine waste (such as coal left in pillars) and the breaker waste.
g. A working or shaft which has been abandoned and filled with refuse (goaf or gob), or with material from the fall of the hanging wall. Syn: condie
h. See: spoil
Source:
Dictionary of Mining, Mineral, and Related Terms












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