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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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This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR). Variations of this method include vein (Alimak) mining, transverse stoping, Avoca and longitudinal …
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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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Pillar extraction, (also referred to as retreat mining; pillar recovery; stooping; pillar robbing; and bord and pillar second workings) is the practice of forming a series of pillars and then partially or totally extracting some or all of the pillars, usually with mining operations retreating out of a panel. There are a number of basic pillar …
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A quick google search about this topic leads to results such as: long holes sublevel stoping, transverse longhole stoping, long hole shrinkage stoping method, sublevel open stoping, and others. All these …
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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 predominant method of longwall mining in Australia is longwall retreat system. In retreat longwall mining, two sets of entries are driven between 100 to 250m apart. When the entries have been driven a predetermined length, say two kilometres, they are connected and a rectangular longwall block is outlined.
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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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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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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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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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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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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 charge factor suggested by many researchers is mostly for the excavation using open pit mining method. The charge factor requirement for underground excavation will be different specially in the case of hard rock excavations, as the mining method in such cases is devised to extract orebodies only.
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Longitudinal view of the LaRonde orebody. Geological setting. Reserves are found in four principal stratigraphic units (from north to south: zones 7, 19, 20 and 21, Figure 2). …
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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 …
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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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The principal mining methods have been summarized in a series of information circulars as follows: ... the stope faces retreat from the end of the ore body or stope limit longitudinally or (where the stopes are run across the lode) from one of its walls. ... Sublevels are developed by first connecting the tops of the raises with a longitudinal ...
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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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Steeply dipping, vein and tabular orebodies are traditionally extracted with longitudinal retreat mining methods such as Eureka and Avoca in a bottom-up sequence with delayed backfill. To increase productivity, sill pillars in the orebody are used to separate mining zones thus allowing production to take place simultaneously in two or more zones. While …
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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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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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Download scientific diagram | Longitudinal open stope mining, or sublevel retreat (after Potvin and Hudyma, 1989). Much of the development necessary for this mining method can be kept in the...
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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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Mining methods. A longitudinal retreat stoping method will be used for the underground mining operation. It was selected to exploit the five mineralised zones, which comprise several narrow veins. The first phase of the mining operation will target a production rate of 1,500tpd between 2024 and 2027. The Cow portal will be used to …
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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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Sublevel caving method with sill pillar is the mining process in which a level is divided into several sublevels, a bottom structure specifically used for ore removal is furnished at the lower part of each sublevel, and stoping of ore proceeds from the top sublevel to the bottom sublevel (Fig. 1).It is also called sublevel caving method with …
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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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For longitudinal retreat the long axis of the stope is along (or parallel) to the strike of the orebody. It may also be referred to as bench stoping or sublevel benching. ... Sublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1]. The method functions on the principle ...
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STILL DRAFTING PROJECT REAL 2 1. i DECLARATION I declare that this project is my own work. ... 11 Fig.3.1 Longitudinal Retreat Mining Method (Source: AGA Mine Technical Services Dept.) 3.2.3 Transverse Open Stoping This method is practiced in wide orebody with widths greater than fifteen meters. A haulage drift is developed through …
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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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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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Sub-level long-hole stoping method with multiple longitudinal panels utilizing delayed backfill is approximately 90% of the production. RMR Rock Quality Designation (RQD) - walls: 80%. ... Primary Mining Method Long-hole sublevel retreat. Information. Yilgarn Star Deep (future zone) Length: 25 m (82 ft) and a pillar of 3 m (10 ft) is left.
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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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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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