A new model for mining method T selection of ,, Mining method selection is a critical point and a strategic issue in the mining engineering process Selection of a method unsuitable for , included in the above list are the stope and pillar mining, vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining Moreover .Mopani Copper Mines, Vertical crater retreat (VCR), both caving and post-fill, have been the predominant mining method utilised within the Nkana mine, but is now being converted to a combination of sub-level caving (SLC) and open stoping techniquVERTICAL CRATER RETREAT, VCR MINING Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO Today, VCR is an established mining method used by mines all over the world .Vertical Crater Retreat | Mining | Nature, Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO Today, VCR is an established mining method used by mines all over the world thatVertical Crater Retreat Mining Method, vertical crater retreat mining method vcr | Mining & World , Applications\Underground Mining / Vertical Crater Retreat -VCR VCR, or Vertical Crater Retreat, is a method originally developed by the Canadian mining company INCO.
Drop Raising in Mining (VCR) Method, Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply orebodi The stope has a similar shape, but instead of small longholes drilled in fans, large blastholes are drilled vertically from a top sill to break through into a bottom sill on the sublevel belowDesign and Application of Sublevel Stoping Methods ,, Introduction 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)Notes on Vertical Crater Retreat Method, Notes on Vertical Crater Retreat Method , mining rate Case Studies Falconbridge Nickel Mines - used for rib pillar recovery (before VCR was employed, cut and fill, and sub-level stoping were employed for pillar recovery) - ,Shrinkage and Vertical Crater Retreat Stoping, Vertical Crater Retreat (VCR) or Vertical Retreat Stoping: configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore, leading them to the base of the block being minedvertical crater retreat mining method vcr, Vertical Crater Retreat - RitchieWiki A vertical crater retreat (VCR), also referred to as vertical retreat mining, involves drilling large-diameter holes into the orebody vertically from the top of the mine, as opposed to the conventional blasthole stope method of drilling them in fans from bottom to top.
vrm mining method, More stoping methods - The Northern Miner Nov 8, 2004 , Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply dipping orebodiUnderground mining (hard rock), VRM/ VCR: Vertical retreat mining (VRM) also known as Vertical crater retreat (VCR) is a method where mine is divided in vertical zones [clarification needed] with depth of about 50 meters using open stoping, bottom-up miningVertical crater retreat, 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 ,vertical crater retreat mining method, Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO Today, VCR is an established mining method used by mines all over the world that have competent, steeply dipping ore and host rockVertical Crater Retreat (VCR): Underground Mine ,, the spherical charge is positioned at a distance underneath and the detonation creates a crater shape opening in the rock -several holes are detonated at the same level creating a horizontal slice ore is excavated in slices starting ,.
SHORT DELAY BLASTING PRESENTATION, Vertical crater retreat The most common drill hole diameter used in VCR mining is 165mm Blasted ore is collected at the draw points using LHD vehicles, and then transported to ore passes, sometimes to be crushed, before it is transported to surface for processing Upon completion of the ore extraction, the stope is often backfilled from ,National Exams May 2015 09, 122 Vertical Crater Retreat (VCR) Discuss the geology, geometry and rock strength issues applicable to the vertical crater retreat mining method (3 marks) , cycle of operations utilizing the vertical crater retreat (VCR) method of mining Clearly show examples of the following in your sketch, "raise", .vertical crater retreat mining method vcr, CRATER RETREAT MINING BY: SUJAN DALBEHERA DEVGAN SINGH ABHAYA MISHRA 1 VCR MINING Vertical crater retreat (VCR) mining is a method originally , Vertical crater retreat - QueensMineDesignWiki Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, .Notes on Vertical Crater Retreat Method, Notes on Vertical Crater Retreat Method , mining rate Case Studies Falconbridge Nickel Mines - used for rib pillar recovery (before VCR was employed, cut and fill, and sub-level stoping were employed for pillar recovery) - each pillar is 107-122 m long, 61 m high and 67 m widevertical crater retreat mining method, Transcript of VCR Vertical Crate Retreat VCR Vertical Crater Retreat VCR The Method Mining of crown pillars get more info Sublevel Stoping RitchieWiki Sublevel stoping is a method of underground mining method that involves vertical mining in a large The vertical crater retreat is a method of sublevel stoping.
vertical crater retreat mining, Vertical Crater Retreat Stoping as Applied at the Homestake, 28 Jul 2012, Therefore, the feasibility of applying the VCR stoping method at the Homestake Mine was explored Vertical Crater Retreat stoping is a recent innovation in large-scale underground mining based on CW ~ivingston'scraterMining method evaluation and dilution control in Kittilä mine, The study is divided into two parts: dilution control and mining method selection Dilution control was done by identifying the reasons for dilution and examining their impact on Kittilä mineVertical Crater Retreatpdf | Economic Geology | Mining, crater retreat (VCR) mining method, illustrated in the were drilled downward into the pillar, and by measuring accompanying sketch This unique and revolutionary the depth of the holes, the results of the uphole blastVCR stoping Flashcards | Quizlet, Vertical Crater Retreat stoping applications orebodies with steep dip , detonation creates crater-shaped openings in the rock when several holes are detonated at same level, a horizontal slice is blasted , VCR mining applicable to similar ore-rock conditions as Sublevel Open stopingVrm Vertical Crater Retreat, Drop Raising in Mining (VCR) Method copper mining India Drop vrm vertical crater retreat Grinding Mill China method used in separating gold mill.
Geotechnical aspects of vertical crater mining method ,, Synopsis Vertical Crater Retreat is compared to other open stoping methods Various geotechnical factors have been considered including the effects of stress concentration, jointing, dynamic stresses superimposed by blasting vibrations, amount of development required and shrinkage drawCreighton's VCR mechanics (vertical crater retreat mining ,, Inco's commitment to Vertical Crater Retreat (VCR) mining has been particularly intense The company has constantly reviewed and incorporated the latest in mining materials, equipment, blasting and filling methods, remote control and the like, and constantly refined VCR planning and design to ensure greater productivity and safety(PDF) Underground mining Methods, c) Unsupported , supported and caving underground mining methods Hard rock under ground mining methods can be classified as the follo wing:- Hard rock Mining Me thodsUnderground mining techniques, Deposits with large vertical heights are mined in slic Mining starts at the top below the hanging wall At this stage, rock bolts are installed for roof control with the back at a conve- nient height Sections below are recovered in one or more steps , Underground Mining Methods and ApplicationsMIN ENG 5932/4932: (Advanced) Underground Mining ,, operational and economic details of various mining methods such as room-and-pillar, sublevel open stoping, VCR, shrinkage, sublevel caving, cut-and-fill, block caving, longwall.