a. A steel or timber element in the lining of a rectangular shaft. Buntons may be 6 in by 5 in or 6 in (15.2 cm by 12.7 cm or 15.2 cm) square and extend across the shaft at intervals of 4 ft to 8 ft (1.2 m to 2.4 m). They serve to reinforce the barring and also carry the cage guides. Rolled steel joists are now generally used as buntons. See also: divider; wallplate. Nelson b. A timber placed horizontally across a shaft. It serves to brace the wallplates of the shaft lining and also, by means of planks nailed to them, to form separate compartments for hoisting or ladderways. Source: Dictionary of Mining, Mineral, and Related Terms
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