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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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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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Abstract. Limiting the amount of ore dilution prior to entering the process stream is the goal of any mining operation. Narrow vein longitudinal retreating mining methods are …
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At Halfmile, all run-of-mine (RoM) material will be mined by underground mining method. Sublevel open stoping (SLOS) and Sublevel Retreat (SLR) will be the main mining methods planned, supplemented by post pillar cut and fill (PPCF) and mechanized cut and fill (MCF) mining for Upper zone where mineralization dip angle is approximately at 39 ...
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5541 Nuthatch Rd., Parker, CO 80134. 2. Retreat Mining - When room and pillar mining advances to the end of a panel, 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.
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open stope. diameter holes (2-3 "). Here, only the drift to be the sublevel open. large diameter (up to 7.5 ") and greater length. Should open a. horizontal slot for positioning the drill. This is ...
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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 …
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In the depth or z-direction, the model extends 520 from the ground surface to well below the lowest level of the orebody. Considering that the mining method is …
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Long-hole open stope is the mining method used at the 777 mine. Mine sequencing involves primary, secondary, chevron and longitudinal retreat stopes that are either paste or unconsolidated loose waste rock backfilled. Long-hole stopes are mined at 15 metre to 17 metre vertical sill to sill intervals. Stope strike lengths are generally 16 metres ...
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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 …
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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 ...
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The pillar stability factor (PSF) is calculated in three different mining stages for a sublevel open stoping mining project located in northern Botswana. Several three-dimensional finite element models were developed by varying the stope span. Pillar strength was estimated using the Lunder and Pakalnis equation and pillar stress was obtained from the …
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Longhole. This method consists in a variety of chambers where the mine blocks are generally cut by sub-levels from which long holes are drilled in plans that are generally …
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The long hole open stoping (LHOS) method will be used for underground mining following a longitudinal retreat approach, with a bottom-up stope sequence. Underground mining will begin after the start of open-pit operations at Goliath, with the first ore from the underground operation expected in year one and sustained commercial …
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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 Sub-level long-hole retreat with backfill. Information. WALTERS ZONE. Stope height: 15.5 m (50.8 ft).
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longitudinal retreat mining method T21:12:41+00:00; Longitudinal longhole retreat QueensMineDesignWiki. Longitudinal longhole retreat is a branch of the generic mining method known as sublevel stoping 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 ...
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Longitudinal longhole retreat is a branch of the generic mining method known as sublevel stoping. For longitudinal retreat the long axis of the stope is along (or parallel) to the strike of the orebody. ... Sublevel stoping is a mining method in which ore is blasted from different levels of elevation but is removed from one level at the bottom ...
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The selected mining method is mainly long hole longitudinal retreat with some stopes using a modified long hole longitudinal retreat method. Primary materials handling fleet will comprise of 10 tonne scooptram Load Haul Dump and 50 t haul trucks.
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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 …
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longitudinal retreat mining method - greenrevolution.in. Sublevel open stoping, by longitudinal retreat, is the most commonly used stoping method.Longitudinal retreat mining of deep, narrow vein lenses under sand fill at the Golden Giant mine resulted in shear failure parallel to the ore - HW contact [Figure 8b12].
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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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Through the partnership, Orica identified an opportunity at Musselwhite to utilize their WebGenTM 100 wireless, through the earth initiation system technology to help reduce dilution in longhole stopeing. Musselwhite uses a modified AVOCA mining method. With increasing depth, blast sizes have had to be reduced to control unplanned dilution.
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2.2 Mining method Most of the production at LaRonde is done by transverse open stoping (with primary and secondary stopes). ... a longitudinal retreat method and backfilled with either cemented rockfill or pastefill. 1 28 33 99 10 10 41111 55 66 12 12 13 13 77 Figure 3 Ideal mining sequence Basalt
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Three-dimensional boundary element modelling is used to compute the stresses induced by the stope extraction sequence as planned with a longitudinal retreat mining method. The proposed methodology can be generalized to other mines that require an understanding of the stress concentrations at the pre-feasibility stage of mine design.
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LHOS is a highly selective and productive method of mining that can be employed for orebodies of varying thicknesses and dips. The main distinct variations of the LHOS used at Obuasi are longitudinal retreat stoping (LRS), and transverse open stoping (TOS). The blind upper stoping(BUS) is a form of LRS or TOS used for partial sill pillar recovery.
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The mining method currently in use is long hole longitudinal retreat sub level open stoping (the Avoca method) with the following parameters: - Sills are driven on 15 m (sublevel) spacing approximately 4.5 m high; - Longhole stopes (panels) are drilled using parallel or fan drill holes between the sublevels (approximately 11 m);
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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 …
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The two mining methods will be longitudinal retreat longhole mining, and VRM with primary and secondary sequencing. Backfilling of stopes will be completed using paste fill, cemented rockfill, and rockfill. Material movement at Aripuanã will be completed via ramps using haulage trucks. Primary development consists of ramps and raises.
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So, a longitudinal retreat mining sequence will be used for the last stope of each draw point on these levels. Stope dimensions will vary with depth to reduce the potential dilution and the risk of seismicity. The transverse long hole mining method allows for a high degree of mechanization and automation and is amenable to tele-operation.
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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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The Kupol deposit is mined by an underground mining method, long hole longitudinal retreat sublevel open stoping, also known as the Avoca method. Sills are driven on 15-metre (sublevel) spacing approximately 4.5 metres high. Longhole stopes (panels) are drilled using parallel or fan drill holes between the sublevels (approximately 11 metres).
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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 applied have also …
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Mining Methods. Lalor mine is a multi-lens, flat lying orebody with ramp access from surface and shaft access to the 955 metre level. Internal ramps located in the footwall of the orebody provide access between mining levels, with the mine currently developed to the 1,240 meter level in the Copper Gold lens 27.
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LHOS- mining method [ 1] Full size image. Recently, the longitudinal SLC-retreat, called remnant mining, is used to mine out unrecovered parts around the …
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A modified Avoca method could also be utilized in some areas of the Main zone and S1 Shallow zone, instead of the more typical SLR. Modified Avoca is an alternative of longitudinal retreat mining method, which has been successfully implemented in Trevali's Caribou and Santander operations.
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