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  1. Waste sand or rock used to support the roof or walls after removal of ore from a stope. Pryor, 3
  2. Sand or dirt placed behind timber, steel, or concrete linings in shafts or tunnels. Nelson
  3. The process of sealing and filling, and/or the material used to seal or fill, a borehole when completed, to prevent its acting as a course along which water may seep or flow into rock formations or mine workings. Long
  4. Material excavated from a site and reused for filling, for example, the use of stones or coarse gravel for filling draining trenches. See also: fill

Source: Dictionary of Mining, Mineral, and Related Terms

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