Back rippings

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The taking down of a thickness of roof beds in roadways some distance back from the face. The thickness of roof excavated may vary from 1 ft (0.3 m) or so to 6 ft (1.8 m) and more. This work is necessary where there has been a gradual reduction in height, as a result of roof sag, and opening height must be maintained. See also: second ripping

Source: Dictionary of Mining, Mineral, and Related Terms


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