goaf


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Related to goaf: goad

goaf

[gōf]
(mining engineering)
That part of a mine from which the coal has been worked away and the space more or less filled up.
The refuse or waste left in the mine. Also known as gob.
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References in periodicals archive ?
And the resistivities of the two goafs were 5 ohm-m and 10 ohm-m, respectively.
Since it is difficult to explore multilayer goafs by common geophysical method, a borehole electromagnetic method is developed in this work to address this issue.
The long wall is placed in 40th coal bed close to the fault "Ceres" and on the mating side the long wall underpasses the goafs of the 37th-39th coal beds.