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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Avoiding repeat levels has slight time-saving effects during operation because it eliminates the further work, like fencing backfill, needed on each level.
Alimak Production Mining, Manroc Developments Inc.
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. Overall costs are lower, but the method also costs more to run, which could deter some but does not faze its proponents. With some exceptions, production blasting can start in the quarter after raise development starts.
The holes are most often mechanically loaded with either ANFO or an emulsion explosive. This is very cost effective as the raise is centred in the stope, which concentrates the support where it is needed most. Fill fence and piping if required. It is often best to leave ore in the stopes while blasting because of the support it gives.
This final step should be allmak in such a way that concerns about adjacent stope stability and hydraulic heads are addressed satisfactorily. The short drill holes make this metho very effective in narrow veins. The ore contacts can be both extrapolated from across the raise and interpolated between raises.
Other improvements have focused on the climber end. Henstridge attributes the higher cost of Alimak mining to reliance alimqk contractors; at Williams mine, that makes it 10 per cent more expensive than longhole stoping.
That means less development in waste rock and a reduction in costs. T hree-quarters of the way intoit became clear that this was a very good year for Claude Resources.
It was in production throughout the 20th century on an intermittent basis and has historically produced in excess of nine million ounces.
A true innovation in underground mining, the Alimak method provides mibing highest safety standards in the industry, while increasing productivity, adding greater flexibility and maneuverability, and reducing overall mining costs. Our longhole stopes are approximately 5, to 10, tonnes, whereas the Alimak stopes are anywhere from 20, to 30, tonnes.
Strike length was also reduced from 15 to 14 metres after problems with hangingwall caving and dilution.
The drifts are commonly sized to accommodate the large scooptrams used for production mucking and are often driven with jumbos. Manroc, Williams and Orica Ltd. All of the equipment is electric and modular.
More Selectivity The short drill holes make this method very effective in narrow veins. Truck dump back slash if required.
So you put in a lot of work, but you get a lot of ore out at the end. 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.
That was the main attraction for Claude Resources, which introduced the Alimak method in its L62 zone at Seabee in late 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.
Allison Henstridge, engineering superintendent at the Williams mine, says the Alimak stopes produce higher tonnages: How Minrail’s shallow-angle mining system reduces dilution and improves productivity.
It allows Maroc the opportunity to share mijing Alimak expertise with staff of Golden Star Resources while training them to take over from it on a progressive basis during the contract period. 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. Experience has shown that the stopes mined with a raise climber tend to be more stable than regular longhole open stopes.
He said that Manroc was selected after a competitive bidding process mniing involved three companies. The climbers require about 4.
Though Manroc alone has collected a double handful of Alimak success stories, uptake of the technique has alimqk limited since it was popularized in the s. Gallery Click on the photos below for a larger view: This allows the drill planning to be done before the production drill is set up in the raise.
Golden Star, Manroc Dev’t agree on Alimak mining method
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 minlng.
Since drills can only reach so far, the traditional approach demands sublevels about every 25 metres.
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. 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.
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 2 years.