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The pillar of coal left between the adjacent panels. These pillars are
often worked on the retreat after the coal in the panels has been
extracted. In the panel system of bord-and-pillar mining, the panel
barrier may be 22 yd (20 m) (minimum) wide and about 300 yd (274 m) apart.
In longwall panel mining, the barriers may be made of sufficient width for
extraction by a conveyor face on the retreat. Also called panel pillar.
See also: Bolsover experiment
Source:
Dictionary of Mining, Mineral, and Related Terms
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