mat packs

mat packs

[′mat ‚paks]
(mining engineering)
Timbers laid side by side into a solid mass 2 by 2½ feet (61 by 76 centimeters) square and 4-6 inches (10-15 centimeters) thick, kept together by wires through holes drilled through the edges of the mass, carried into a mine and built up to make effective roof supports.
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References in periodicals archive ?
The stopes at Kloof are supported by timber mat packs on a 2-m by 2-m pattern and are backfilled with classified mill tailing using the bag system.
Instead of setting and tightening the mat packs against the hanging wall by hammering in wedges, the packs are set tight by pumping fast-setting grout into a grout bag placed between the top of the pack and the hanging.
The solidly grouted mat packs do not have this disadvantage.