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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Committed to safety and excellence, Manroc is at the forefront of Alimak mining, generating safer and more productive methods. Where required, the stope hangingwall can be supported with deformed strand resin-grouted cable bolts in a regular pattern along the raise. It was in production throughout the 20th century on an intermittent basis and has historically produced in excess of nine million ounces.
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. Canmet representatives spent time observing SAMS in use and interviewed mine workers about their experience using the system.
The stopes can also be mined in a shrinkage fashion, with added support gained from the broken ore in place. Less Dilution The production drill sits in the middle of its work, cutting the drilled length in half. Dilution is hard to control and it can be awkward and difficult to secure the roof with bolts or screens. That was the main attraction for Claude Resources, which introduced the Alimak method in its L62 zone at Seabee in late This advantage is easily visualized if one imagines the hangingwall as a fractured beam or plate.
We are pleased to provide lateral mine development as a part of our comprehensive range of underground mining services.
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Allison Henstridge, engineering superintendent at the Williams mine, says the Alimak stopes produce higher tonnages: Recognized as a leader in Alimak LH narrow vein stope mining, Manroc has developed proven and effective mininb yielding high tonnage and low dilution results.
Fill fence and piping if required. Cable aimak provides 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. Fewer, alima, stopes can be taken quicker mijing there are fewer cycles, i. This type of mining is best suited to tabular narrow vein ore bodies with enough dip for gravity ore flow.
Successful users of the technique have found that it accelerates their path to production by centring development work within the ore body. Your email address will not be published. The drifts are commonly sized to accommodate the large scooptrams used for production mucking and are often driven with jumbos.
Williams had expanded its Alimak production several years earlier with the help of narrow vein specialists Manroc Developments Inc. Cables can be installed right up the middle of the hangingwall, where they will do the most good.
There is often considerably alimaak waste development with raise mining than with regular open stoping. An independent report by CanmetMines, part of Natural Resources Canada, outlining the test results will be published sometime in August. In regular open stoping, overcuts and undercuts provide access to the ore along strike.
Golden Star, Manroc Dev’t agree on Alimak mining method – SAMSSA
Experience has shown that the alimaak mined with a raise climber tend to be more stable than methov longhole open stopes. The Seabee mine had to adapt to this new cycle. These drifts are driven from the shaft or established mining areas to the new ore zone. Greg Dipple of UBC has discovered that certain mine tailings can be used for carbon sequestration, and the implications could be enormous.
With some exceptions, production blasting can start in the quarter after raise development starts. Tailings to the rescue Greg Dipple of UBC has discovered that certain mine tailings can be used for carbon sequestration, and the implications could be enormous.
Alimak Production Mining, mine engineering, Alimak Raising, Lateral Development, Narrow Vein Mining
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. The ore contacts can be both extrapolated from across the raise and nining between raises.
The down dip helps the toes break to the stope wall. He said that Manroc was selected after a competitive bidding process that involved three companies.
One of the disadvantages to mining long, straight raises is that it becomes difficult to follow high-grade ore. The graph ordinate is an estimate of the rock stability and includes factors for block size, joint surface condition, rock strength, joint orientation and the effect of gravity. 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.
Ground Control Experience has shown that the stopes mined with a raise climber tend to be more stable than regular longhole open stopes. Manroc Developments is a full service mine engineering company employing a highly qualified team of mining engineers and associates with extensive experience in underground mining.
Faster Access to Undeveloped Ore Once the climber nests are established, ore starts to flow. Henstridge attributes the higher cost of Alimak mining to reliance on contractors; at Williams mine, that makes it 10 per cent more expensive than longhole stoping.
The change in geometry and improvement in ground support allows stope heights in the order of 75 to metres, eliminating many sub-levels and their associated development.
Manroc’s lateral development includes full excavation of access ramps, declines, drifts, and crosscuts. The double railing forms the backbone of the system: Drawpoints and Climber Nest: