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- To fill and seal undesirable openings, fissures, or caving zones in a borehole by cementation or by lining the borehole with pipe or casing. Also called blank off; case off; seal off. Long
- To secure a mine opening against the flow or escape of gas, air, or liquid by erecting rock, concrete, steel, wood, or cloth barriers. Long
- To erect barriers to prevent workers from entering unsafe areas in underground workings. Long
Source: Dictionary of Mining, Mineral, and Related Terms
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