advancing longwall

advancing longwall

[əd′vans·iŋ ′lȯŋ‚wȯl]
(mining engineering)
Mining coal outward from the shaft pillar, with roadways maintained through the worked-out portion of the mine.
References in periodicals archive ?
|However,~ advancing longwalls which require no development present serious problems at the face ends, and the technology to develop the face ends and maintain roadways behind the face in the goaf has not matched the productivity levels achieved on the retreating longwall".
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