jackleg

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jackleg

[′jak‚leg]
(engineering)
A supporting bar used with a jackhammer.
References in periodicals archive ?
They have started using the man-up machines to move drilling operations away from jacklegs and stopers," Hardman said.
While many underground mines are looking to avoid handheld rock drills for the safety of the miners, there are still many mines in North America where jackleg drilling is a must.
PHQ 250 JHSL pneumatic jacklegs were already being used for the installation of ground support at the site where the comparison testing took place.
The tunnel was constructed with drill-and-blast technology, using jacklegs," Scott said.
Five employed single jacklegs per heading and the sixth a single boom, 15 kW electro-hydraulic mini-jumbo.
In zones where the horizontal width is less than 8 ft, slusher mining and jacklegs will be used to mine to a minimum width of 6 ft.
Most of this work is accomplished from the top of hydraulic scissor lifts, using pneumatic jacklegs and stopers.
The manufacturer, mining contractor JIC Mining Services, designed the twin-boom Mantis rig to fill the gap between handheld jacklegs and big production jumbos.
While initially the idea may seem far-fetched, especially when considering the fact that jacklegs are still the tool of choice for profitable mining in some areas of the world, the real-world technology presented in Sudbury has shown that it is within the industry's reach.
5 ft/man-shift, that has not changed in 50 years even though technology has moved from jacklegs and pneumatic hammers to advanced jumbos.
Copper production was restarted using the available Atlas Copco Boomer 226 and Tamrock Micromatic jumbos, jacklegs, and a 2 [yd.