Raise climbing, widely known as the Alimak mining method after the company that introduced it, is a variation on longhole stoping developed. Hard Rock Selective Mining. Methods. • Room and Pillar. • Cut and Fill. • Shrinkage. • Alimak Mining. • Raise bore and Box hole Mining. Maxwell Adombila Akalaare 22 September Golden Star Resources (GSR) has sealed a three-year deal with Canadian mining contractor.
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Golden Star, Manroc Dev’t agree on Alimak mining method – SAMSSA
It is often best to leave ore in the stopes while blasting because of the support it gives. The President and Chief Executive Officer of Golden Star, Sam Coetzer, had earlier said in a statement that the appointment of a mining contract was the next important step in efforts aimed at reviving the mine. There are several projects in Canada that could benefit from the technology — perhaps half a dozen are assessing their properties and reviewing their mine plans, Beauvais says.
The short drill holes make this method very effective in narrow veins. The raise mining method takes advantage of this concept because, even though the hangingwall is only supported up its centre, the metbod two unsupported strips are long and narrow and are more likely to be self-supporting. Williams had expanded its Alimak production several years earlier with the help of narrow vein specialists Manroc Developments Inc. The broken ore often compacts slightly, resulting an effective swell of about one third its unbroken volume.
The bulk of the waste development required with metyod method is the ore zone access and the raise climber nests.
A Leader in Alimak Mining
The stopes can also be mined in a shrinkage fashion, with added support gained from the broken ore in place. Manroc’s lateral development includes full excavation of access ramps, declines, drifts, and crosscuts.
This allows the drill planning to be done before the production drill is set up in the raise.
Henstridge attributes the higher cost of Alimak mining to reliance on contractors; at Williams mine, that makes it 10 per cent more expensive than longhole stoping. Fill alimqk and piping if required. The production drill sits in the middle of its work, cutting the drilled length in half. This step is done once the stope is completely blasted.
Teck installs first production-scale machine learning system Machine learning predicts when trucks will need maintenance at Fording River coal mine. Experience has shown that raises from 75 to metres length are the most economical.
Faster Access to Undeveloped Ore Once the climber nests are established, ore starts to flow.
He said that Manroc was selected after a competitive bidding process that involved three companies. It was placed on care and maintenance by Golden Star, while evaluation and exploration activities continued.
It is better if the ore body is continuous over several hundred feet vertically. Drill holes extend to just less than half way to the next raise and are oriented slightly down from horizontal.
Stope stability decreases with increasing hydraulic radius, so it can be deduced that a long thin opening will be more stable than a squat opening of the same area, with all else mininb equal. Intuitively, geometry favors raise climber mining, in that access is gained to the centre of the stope hangingwall where the ground support does the most good.
The set-up also provides ventilation if miners leave open one of the raises after breaking through to metohd next level. Canmet representatives spent time observing SAMS in use and interviewed mine workers about their experience using the system.
Raises must be driven big enough that a 2. Beauvais says the technology is a cousin of the Alimak Climber, developed in the jining, which similarly works on a monorail mounted on the ceiling. We are pleased to provide lateral mine development as a part of our comprehensive range of underground mining services.
The main ore access is gained by driving a raise up dip along the centre of the stope hangingwall, rather than from over and under-cuts driven along strike, as is minkng with regular open stoping.
Alimak Production Mining, mine engineering, Alimak Raising, Lateral Development, Narrow Vein Mining
With better ground control, larger stopes can be taken. The lens of interest stood metres away from historical infrastructure; with lateral development included, a metre-high stope at Seabee would have taken 16 to 18 months to mine out using longhole stoping. Dilution is hard to control and it can be awkward and difficult to secure the roof with bolts or metod.
Prestea Underground is a narrow, high grade deposit with mineral reserves of 1. Avoiding repeat levels has slight time-saving effects during operation because it eliminates the further work, like fencing backfill, needed on each level.
It is also quite common that the production holes in the raise mining method are smaller than in regular stoping, which will spread the explosive energy more evenly. Drawpoints and Climber Nest: Our full team of mininf Raise Miners, Supervisors and Managers, ensure your project is carried out laimak, while meeting all budget and time constraints.
The hydraulic radius is defined as the cross-sectional area of the opening divided by its perimeter. The climber nests are always in the hangingwall.