Back filling
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- Rough masonry built in behind the facing or between two faces; similar material used in filling over the extrados of an arch; also, brickwork used to fill in space between studs in a frame building, sometimes called brick nogging. ACSG, 1
- The filling in again of a place from which the rock or ore has been removed. Ballard
Source: Dictionary of Mining, Mineral, and Related Terms
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