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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Cables can be installed right up the middle of the hangingwall, metod they will do the most good. The climber holds two to three people and the drilling and blasting equipment they need. The hydraulic radius is defined as the cross-sectional area of the opening divided by its perimeter. Once installed, the system can be operated by one person and can develop stopes that are 12 to 15 metres wide and a minimum of 1.
Eliminating the intervening levels cuts out a good chunk of lateral development time and spending. Review our range of underground mining services below. Raises must be driven big enough that a 2. It is often best to leave ore in the stopes while blasting because of the support it gives.
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. Canmet representatives spent time observing SAMS in use and interviewed mine workers about their experience using the system.
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.
Alimak Production Mining, mine engineering, Alimak Raising, Lateral Development, Narrow Vein Mining
Avoiding repeat levels has slight time-saving effects during operation because it eliminates the further work, like fencing backfill, needed on each level. The production drill holes are oriented slightly down from along strike, which is also roughly perpendicular to that found miniing the regular open stoping method.
Typically, the angle results in slow development, low productivity and difficult work flow. 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 allmak method at its Seabee gold mine in Saskatchewan. Drawpoints can be driven from either footwall or hangingwall, depending on how the ore zone is accessed.
alimai A new canopy design has provided more room on the climber platform. 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. The blasts are timed to slash down, with the footwall holes often the last to methood.
The Alimak mining method, which Manroc prides itself as the inventor, uses an Alimak raise climber to develop a raise in the ore body followed by drilling production holes in the ore body and blasting. An independent report by CanmetMines, part of Natural Resources Canada, outlining the test results will be published sometime in August. Manroc, Williams and Orica Ltd.
The advantages of this mining method are: With less development, faster ore mehod, better ground control, and faster overall mining, it is easy to see how raise mining will cost less than regular open stoping. This step is done once the stope is completely blasted.
The climbers require about 4. Less Development The bulk of the waste development required with this method is the ore zone access and the raise climber nests. This improves drill accuracy which, in conjunction with the better ground mininh, reduces dilution substantially. Claude Resources used Dumas Ltd.
The stopes can also be mined in mehtod shrinkage fashion, with added support gained from the broken ore in place. Steelmaking coal price surge reinvigorates Canadian mines Kylie Williams. An alimak leaves its nest to climb into a raise Courtesy of Manroc Developments Inc.
Prospects good for long term copper price, despite current volatility Lack of major copper discoveries mean supply will likely fall short of demand in next decade. In regular open stoping, overcuts and undercuts provide access to the ore along strike.
Since drills can only reach so far, the traditional approach demands sublevels about every 25 metres. The method works best if the ore boundaries can be interpolated between adjacent raises. The short drill holes make this method very effective in narrow veins. The Alimak Mining Method Raise Climber Mining Conditions This type of mining is best suited to tabular narrow vein ore bodies with enough dip for gravity alimaak flow.
Strike length was also reduced from 15 to 14 metres after problems with hangingwall caving and dilution. The method requires less ore and waste support development than conventional shrinkage mining and is more efficient to bring into production and to operate.
Overall costs are lower, but the method also costs more to run, which could deter some but does not faze its proponents.
Golden Star, Manroc Dev’t agree on Alimak mining method
Drawpoints and Climber Nest: This includes the telescopic platform from which the miner controls the system. It was in production throughout the 20th century on an intermittent basis and has historically produced in excess of nine million ounces.
These drifts are also driven from the shaft or existing development but, unless there apimak another lift, they often need only be large enough for the movement of supplies. 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.
Skip to content Back to News Next Article. Maxwell Adombila Akalaare 22 September Backfill Fill fence and piping if required. Ground support follows development and production drilling follows right after that. The President and Chief Executive Officer of Golden Star, Sam Coetzer, had earlier said in a alimk that the appointment of a mining contract was the next important step in efforts aimed at reviving the mine.
Most of the rest of the development is in ore methdo centerfold.