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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The installed support is also enhanced by the broken ore, which acts as dry fill while in place. The Seabee mine had to adapt to this new cycle.
Allison Henstridge, engineering superintendent at the Williams mine, says the Alimak stopes produce higher tonnages: After the raise is driven it often must be rehabilitated, subject to ground conditions, for the safety of production crews. The hydraulic radius is defined as the cross-sectional area of the opening divided by its perimeter. There are several explanations, which include: Once the top of the stope has been reached, the miners descend again, screening the raise walls as they go.
Raise mining is a “longhole” method of bulk mining tabular narrow vein ore bodies. This should also contribute to a more stable hangingwall.
We are your preferred underground mining professionals. Experience has shown that raises from 75 to metres length are the most economical. Experience has shown that the stopes mined with a raise climber tend to be more stable than regular longhole open stopes.
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 ore flow.
At Manroc, we have developed innovative solutions and highly specialized skills making us a leader in narrow vein exploitation. Since drills can only reach so far, the traditional approach demands sublevels about every 25 metres. Stopes can be as little as 3 feet thick, or even minng in ideal circumstances. There are several explanations, which include:.
The sub-horizontal production drill hole direction allows the use of the undercut as a slot and because of the increased stope height, there will be significantly fewer of these than there would be slots required for regular open stoping in the same area.
Less Dilution The production drill sits in the middle of its work, cutting mininv drilled length in half.
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The holes are most often mechanically loaded with either ANFO or an emulsion explosive. A ramp is not required and, in many cases, neither is the muck pass and ventilation raise of a regular stoping system.
Raise climbing brings production gains to Canadian companies. Raise climbing, widely known as the Alimak mining method after the company that introduced it, is a variation on longhole stoping developed for narrow-veined, tabular ore bodies. The method works best if the ore boundaries can be interpolated between adjacent raises. Manroc, Williams and Orica Ltd. The company has committed to expanding the method beyond its current, relatively small lens.
Other improvements have focused on the climber end. Fewer, larger stopes can be taken quicker because there are fewer cycles, i. A new canopy design has provided more room on the climber platform.
Alimak Production Mining, mine engineering, Alimak Raising, Lateral Development, Narrow Vein Mining
Backfill Fill fence and piping if required. 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.
Alimak rack and pinion elevators are ideally suited for providing the secondary, emergency vertical access required by mine safety regulations. Gallery Click on the photos below for a larger view: It is often best to leave ore in the stopes while blasting because of the support it gives.
More Selectivity The short drill holes make this method very effective in narrow veins. Greg Dipple of UBC has discovered that certain mine tailings can be used for carbon sequestration, and the implications could be enormous.
The advantages of this mining method are: This step is done once the stope is completely blasted.
The climber holds two to three people and the drilling and blasting equipment they need. Less Cost 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.
Drill holes alkmak to just less than half way to the next raise and are oriented slightly down from horizontal.
Overall costs are lower, mkning the method also costs allimak to run, which could deter some but does not faze its proponents. At crushing plants, where the operator has to control feeders, bins, conveyors, etc. It is better if the ore body is continuous over several hundred feet vertically. 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.
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.