Gold, Platinum and Chrome Mines
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CemRite
The CemRite Pack has internal re-enforcement to assist the essentially brittle internal grout mix to yield in a controlled manner under convergence. The result is a well pumped tight fitting tailings based grout support, whose internal re-enforcement will allow the pack to yield even after blast damage removes the outer bag.
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Mining Timber
MPD designed a number of timber pack units that utilized different timber species in the same unit to exact improved performance. This allowed stiffer narrower blocks to ‘bite’ into wider slabs to allow the timber to dissipate energy and allow the packs to yield over large deformations without generating the large loads normally associated with timber slab packs.
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Pack Pre-stressing
MPD have designed a system using conventional and readily available pumps to pump a grout that does not set in the pump, even if left for a week. Hoses can be as long as 30m allowing two panels to be pumped from one site. To complement the system, MPD developed a strong pre-stressing bag that can take the required pressures to pump a 75 x 75cm pack to a pre-load of 200kN.
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PoweRite Bags
The system designed by MPD includes layers that use internal elongates as guides as the layers are filled. The bag layers are placed in the required position, elongates installed, and then the layers are merely pumped with the tailings up to the hangingwall. Since multiple layers are used with a high surface area to volume ratio, de-watering is efficient, and slump of tailings in the installation is minimized.
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Temporary Support
The RockRite uses a conventional ‘cam’ pre-stressing system to pre-stress a sharpened timber pole. The sharpened end of the timber would allow the prop to yield under convergence (thus protecting the steel section) and the timber section can simply be replaced when necessary.
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Timber Elongates
The latest contribution to the elongate market is the ‘NimRite‘ Prop, manufactured and supplied by Timrite (Pty) Ltd. This product was designed through a request from the gold mining industry and will yield through 400mm of deformation without ‘walking’ during the yield phase, a common feature of timber elongates. The NimRite will stand-up straight through-out its yield mode.
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VentRite
The VentRite gives the end user the ability to build ventilation walls quickly and efficiently, either from surface pumped tailings based grout or pre-bagged mix. The VentRite has been used for in-stope ventilation where a 2m high wall, 6m long can be pumped in an hour, and also in the sealing of large excavations where walls as big as 6 x 6m have been completed.
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