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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That means less development in waste rock jethod a reduction in costs. Skip to content Back to News Next Article. Backfill Fill fence and piping if required. Less Dilution The production drill sits in the middle of its work, cutting the drilled length in half. The method requires less ore and waste support development than conventional shrinkage mining and is more efficient to bring into production and to operate.
The mine was previously in production 14 years ago. Cable bolting minning better ground support from its position in the central hangingwall of the stope, and the broken ore adds support by putting outward pressure on raise walls. Now a typical Alimak stope is 80 or 90 metres high and mucked more often — an improvement for grade and scheduling. Much of the equipment is remotely controlled, and in the future Beauvais expects to automate tasks as well.
The short drill holes make this method very effective in narrow veins. An alimak leaves its nest to climb into a raise Courtesy of Manroc Developments Inc. The hydraulic radius is defined as merhod cross-sectional area of the opening divided by its perimeter.
In regular open stoping, overcuts and undercuts provide access to the ore along strike. These drifts are also driven from the shaft or existing development but, unless there is another lift, they often need only be large enough for the movement of supplies. It is safest to take a few rings per blast, so that miss-holes or other blasting problems are qlimak for correction. Beauvais says the technology is a cousin of the Alimak Climber, developed in the s, which similarly works on a monorail mounted on the ceiling.
This is very cost effective as the raise is centred in the stope, which concentrates the support where it is needed most. This should also contribute to a more stable hangingwall. Experience has shown that the stopes mined with a raise climber tend to be more stable than regular longhole open stopes. At Manroc, we have developed innovative solutions and highly specialized skills making us a leader in narrow vein exploitation.
The down dip helps the toes break to the stope wall.
Managing risks Though Manroc alone has collected a double handful of Alimak success stories, uptake of the technique has been limited since it was popularized in the s. Steelmaking coal price surge reinvigorates Canadian mines Kylie Williams.
Ground support follows development and mthod drilling follows right after that. Typically, the angle results in slow development, low productivity and difficult work flow. These drifts are driven from the shaft or established mining areas to the new ore zone. Faster Access to Undeveloped Ore Once the climber nests are established, ore starts to flow.
Alimak Production Mining, Manroc Developments Inc.
We are your preferred underground mining professionals. Though Manroc alone has collected a double handful of Alimak success stories, uptake of the technique has been limited since it was popularized in the s.
How Minrail’s shallow-angle mining system reduces dilution and improves productivity. They blast the first few metres of the raise and then install a climber running on a curved rail from the nest into the raise.
SAMS mechanizes much of the work that in traditional underground mining is done by hand — using long tom drills instead of handheld jack leg drills, for example.
Overall costs are lower, but the method also costs more to run, which could deter some but does not faze its proponents. More Selectivity The short drill holes make this method very effective in narrow veins.
With some exceptions, slimak blasting can start in the quarter after raise development starts. One of the disadvantages to mining long, straight raises is that it becomes difficult to follow high-grade ore.
With Alimak mining, it took nine months. The company had earlier stated that gold production was expected to resume at the Prestea concession by mid after going through successful redevelopment over the last allmak years. The ore contacts can be both extrapolated from across the raise and interpolated between raises. That was the main attraction for Claude Resources, which introduced the Alimak method in its L62 zone at Seabee in late Once the top of the stope has been reached, the miners descend again, screening the raise walls as they go.
The broken ore often compacts slightly, resulting an effective swell of about one third its unbroken volume. Switching to a new drill, they drive cable bolts up the centre of the raise, grout them in place and drill production holes. Raise climbing brings production gains to Canadian companies. The double railing forms the backbone of the system: The raise mining method takes advantage of this concept because, even though the hangingwall is only supported up its centre, the resulting two unsupported strips are long and narrow and are more likely to be self-supporting.