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2 Sublevel retreat mining method The SLR mining method is a top-down unsupported method with no backfill. It is similar to sublevel cave mining in function, except the waste rock hanging wall is strong enough to not cave. Rather than subsidence, it leaves a glory hole exposed to surface.
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Four case studies show that SLSh could be a viable alternative for stoping (e.g. sublevel open stoping "SLOS" or longhole open stoping "LHOS") and SLC in …
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Strategic sill pillar design for reduced hanging wall overbreak in longhole mining. Steeply dipping, vein and tabular orebodies are traditionally extracted with …
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ABSTRACT: This paper discusses the main causes for unplanned ore dilution in longhole mining and possible mitigation measures. It reports on the results of a case study of an underground mine that uses the longitudinal retreat method for the extraction of a narrow gold- silver orebody. The study is conducted with finite difference software FLAC3D.
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retreat mining may begin. Retreat mining is a planned and engineered method of removing all or part of the pillars. The removal of the pillars occurs in the opposite direction (retreat) from which the mining initially advanced. In retreat mining, as much coal as is feasible is mined from the pillars that were created in advancing the panel.
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Abstract: Diavik Diamond Mine is located on the subarctic tundra of the Northwest Territories, Canada, 300 km northeast of Yellowknife. When its first two open pits were exhausted in 2012, it completed the full transition to underground mining. Three orebodies are currently being mined underground using two mining methods: blasthole open …
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The deepest mining to date is on level 233 (2,330 m below surface), and the decline has reached level 242. LaRonde uses two mining methods: longitudinal retreat in 15-m sections with cemented rockfill or cemented pastefill, as well as transverse open stoping with both cemented and unconsolidated rockfill as well as cemented pastefill.
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The Obuasi Mine has been in operation for the past 100 years. Within this period a host of mining methods have been employed during its various changing phases. The causes for the changes are multiple, ranging from orebody capability, dynamics, technology, safety, economics, production levels, geotechnical, etc. Mining methods …
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What is VCR method of mining? Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottom-up mining method that involves vertically drilling large-diameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut. ... For longitudinal retreat the long …
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The underlying premise of MSAHP is that the mining method best suited to the orebody will also be the most economical. Keywords mining method selection, orebody characteristics, Analytic Hierarchy Process. Introduction Mining method selection is a process whereby the mining method attributes are matched to the orebody …
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Three orebodies are currently being mined underground using two mining methods: blasthole open stoping and sublevel retreat (SLR). SLR was not an original method as …
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the mines were operating with these open stope mining methods [7]. This percentage increased to over 60% a decade later [], 8 and open stoping continues to be the most widely used mining method in new Canadian underground mines [5 ]. For this mining method, two basic stope congurations are possible: longitudinal and transverse. Longitudinal ...
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This paper examines considerations for ventilation, production drilling and blasting, geotechnical concerns, and operational constraints for SLR mining in the subarctic. It …
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Modified Avoca is a longitudinal retreat mining method. Stope sequencing generally follows a retreat along strike from lens extremities or strategic starting points, and retreats to ramp access points. The stopes are typically excavated 16 m along strike, and to a nominal height of 25 m floor-tofloor. Stope width is normally the same as the ...
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The longitudinal method uses two drifts (upper and lower) running along the strike through the orebody with fewer cross cuts, thus requiring less mine development. Stoping and backfilling are often practiced in longitudinal retreat; see Fig. 1 c. Both transverse and longitudinal stoping methods are particularly suited for steeply dipping …
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Primary Mining Method Sub-level long-hole retreat with backfill. Information. The narrow mining from the Walters zone represents only a small part of the production and is rather recent. The technical services are still working to calibrate the ideal dimension of a stope. Some stopes are opened more than two levels high thus creating dilution ...
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Longhole Stoping is a popular large scale underground mining method for metalliferous mine known for its ability to simplify stope sequencing. It encompasses advantage of Faster Stope...
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Selecting a Mining Method. ... Some common ones include longitudinal stoping, transverse longitudinal stoping, big-hole stoping, and vertical crater retreat. Longitudinal stoping, also referred to as …
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This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method. ... The charging pattern is designed along the holes in five longitudinal sections (A-A, B-B, C-C, D-D and E-E as shown in Fig. 8 a) and is shown in Fig. 8 b. As can be seen, after the first blast, it is quite complex to conduct the subsequent blasting.
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The Obuasi Mine - Longitudinal Retreat Mining Method Application and Challenges. The Obuasi Mine has been in operation for the past 100 years. Within this period a host of …
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Longitudinal Longhole stoping mining, stopes may be retreated in the direction of the cross-cuts with a top- down or bottom-up sequence. This is shown in figure 1. ...
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Stoping is a method of extracting ore from an underground mine that leaves behind an open space called a stope. This guide outlines the important purpose a stope serves in underground mining and the …
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5220 L (1591 m). A vertical longitudinal iUvjection of the mine is shown in Fig. 1. Fig. 1 vertical Longitudinal Projection of Mindola Mine ... Crater Retreat mi n i ng method a potential ... various parameters for implementing the method. VCR Method This mining method uses spherical charges as aga i nst col umn charges3,4,5,6 used ...
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The Island Gold underground mine is mined using longitudinal long-hole retreat mining or modified Avoca mining method, as it is considered the most productive and economic option. The drilling technique involves drilling a series of vertical holes in the ore from one level to the other and then blasting the ore in vertical slices.
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The PLS uranium project will be operated as an underground mine using longhole stoping method in a longitudinal retreat orientation. The completed stopes will be backfilled with cemented rock …
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Sublevel shrinkage (SLSh) is an underground mining method similar to sublevel caving (SLC) but with continuous backfilling from the top. It features a top-down …
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Learn about the different methods of stoping ore in underground mines, including shrinkage stoping, which is based on artificial support of the stope. Find out the advantages, disadvantages, and …
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Mining Method: Longitudinal stoping; Sill mining; Sub-level Retreat; Longitudinal retreat; Longhole stoping; Production Start... Snapshot: The Casposo-Manantiales complex (Casposo Mine) was placed on care and maintenance during the June 2019 quarter and exploration activities that commenced during the December 2019 quarter have been …
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Various stoping methods are practised across the globe for the final extraction of mineral deposits. The selection of a feasible mining method for a mine is dependent on the technical suitability ...
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