The main wire rope hoist is suitable for carrying heavy loads at relatively fast speeds and is the primary means of vertical access for men and materials in an. Wherever an elevator for inspection, emergency, or interlevel hoisting is required in mines and underground shafts, the Alimak rack and pinion elevator is the. Raise climbing, widely known as the Alimak mining method after the company that introduced it, is a variation on longhole stoping developed.
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Raise climbing brings production gains to Canadian companies. The hydraulic radius is defined as the cross-sectional area of the opening divided by its perimeter. One of the disadvantages to mining long, straight raises is that it becomes difficult to follow high-grade ore.
Raise (mining) – Wikipedia
The Seabee mine had to adapt to this new cycle. Raise Climber Mining Method Details The raise climber mining method will generally be comprised of the following steps: Customer profitability In a ‘time is money’ world, jining ensure customers get materials and personnel transported higher, faster and safer.
Formation of this beam is helped by the ability to cablebolt up the centre of the hangingwall as well as on top and bottom sills.
Truck dump back slash if required. These drifts are also driven from the shaft or existing development but, unless there is another mlning, they often need only be large enough for the movement of supplies.
A alimqk innovation in underground mining, the Alimak method provides the highest safety standards in the industry, while increasing productivity, adding greater flexibility and maneuverability, and reducing overall mining costs. 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 done with regular open stoping. This allows the drill planning to be done before the production drill is set up in the raise.
Allison Henstridge, engineering superintendent at the Minimg mine, says the Alimak stopes produce higher tonnages: The climber nests are always in the hangingwall. Raise Mining Raise mining is a “longhole” method of bulk mining tabular narrow vein ore bodies. Better Ground Control Cables can be installed right up the middle of the hangingwall, where they will do the most good. With better ground control, larger stopes can be taken. The change in geometry and improvement in ground support allows stope heights in the order of 75 a,imak metres, eliminating many sub-levels and their minin development.
Since drills can only reach so far, the traditional approach demands sublevels about every 25 metres. Drill holes extend to just less than half way to the next raise and are oriented slightly down from horizontal.
Once the top of the stope has been reached, the miners descend again, screening the raise walls as they go. Less Cost With less mmining, faster ore access, better ground control, and faster overall mining, it is easy to see how raise mining will cost less than regular open stoping. The climber holds two to three people and the drilling and blasting equipment they need. Ground support follows development and production drilling follows right after that. The graph is divided into areas that have been delineated by observed stope behaviour.
In a ‘time is money’ world, we ensure customers get materials and personnel transported higher, faster and safer. Henstridge attributes the higher cost of Alimak mining to reliance on contractors; at Williams mine, that makes it 10 per cent more expensive than mijing stoping. Once the climber nests are established, ore starts to flow. The installed support is also enhanced by the broken ore, which acts as dry fill while in place. This improves drill accuracy which, in conjunction with the better ground control, reduces dilution substantially.
Alimak Production Mining, mine engineering, Alimak Raising, Lateral Development, Narrow Vein Mining
The set-up also provides ventilation if miners leave open one of the raises after breaking through to the next level.
Tinkering with the drill rig set-up allowed an entire ring of production holes to be drilled without repositioning the drill more than once. Ken McKirdy, chief engineer at Manroc, says the Alimak method provides benefits beyond ore access. Alimal stopes can also be mined in a shrinkage fashion, with added support gained from the broken ore in place. The Saskatoon-based gold miner had increased its year-to-date gold production by 63 per cent overthanks in part to a successful implementation of the Alimak mining method at its Seabee gold mine in Saskatchewan.
A narrow vein ore body has less ore to soak up waste development costs, making the raise mining method an obvious choice.
Other improvements have focused on the climber mkning. Specialized Services Professional Mine Engineering Manroc Developments is a full service mine engineering company employing slimak highly qualified team of mining engineers and associates with extensive experience in underground mining.
In theory, and if properly cabled, the foliated hangingwall could be approximated as a laminate beam by the Voussoir approach, as described by Hutchinson and Diederichs An alimak leaves its nest to climb into a raise Courtesy of Manroc Developments Inc. After each round of blasting, the broken ore falls down the raise and is collected by a alimakk. Fewer, larger mininf can be taken quicker because there are fewer cycles, i. Switching to a new drill, they drive cable bolts up the centre of the raise, grout ali,ak in place and drill production holes.
A true innovation in underground mining, the Alimak method provides the highest safety standards in the industry, while increasing productivity, adding greater flexibility and maneuverability, and reducing overall mining costs. We have a solid reputation when it comes to employing the safest and most productive techniques available. Mining narrow ore bodies is vital to the international mining industry, and involves a high level of expertise surrounding geological issues.
This should also contribute to a more stable hangingwall. 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. Avoiding repeat levels has slight time-saving effects during operation because it eliminates the further work, like fencing backfill, needed on each level. Eliminating the intervening levels cuts out a good jining of lateral development time and spending.
This step is done once the stope is completely blasted. At crushing plants, where the operator has to control feeders, bins, conveyors, etc.
The Alimak elevator is the perfect solution for underground as well as akimak mining industry applications, such as pelletising plants, smelters, concentrators, and other ore processing plants. With less development, faster ore access, better ground control, and faster overall mining, it is easy to see how raise mining will cost less than regular open stoping.