Vertical Crater Retreat - digistar..ca
Mining retreats horizontally as successive vertical slices are blasted. Vertical block mining is the term most often used for this method. In VBM the workplace is divided into a series of vertical blocks and the blocks may be nined on a retreat basis working from the ends of the workplace.
Vertical Crater Retreat | PDF | Mining | Science
· CASE STUDY ON VERTICAL. CRATER RETREAT MINING. BY: SUJAN DALBEHERA DEVGAN SINGH 1. ABHAYA MISHRA 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 that have competent, steeply …
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VCR VCR(Vertical Crater Retreat mining method)[1-2],1974,,。
Geotechnical aspects of vertical crater mining method in a ...
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 draw. All these factors favour a VCR method in a deep mining environment.
Evolution of Vertical Crater Retreat Mining at Mindola ...
Mindola mine is currently the deepest mine in the Zambian copper belt. Stoping is currently active to 1330 m below surface with long range plans indicating future production from 1590 m level. The orebody is tabular and dips between 55o to vertical. The thickness varies from 8 to 14 m. The vertical crater retreat method of mining was first introduced at Mindola mine in the late-1980s …
(PDF) Shrinkage stoping and Vertical Crater Retreat stoping
8. VCR - V ertic al Cra ter R etr eat. V ert ical Crater Retreat (VCR) or V ertical Retreat Stoping: configuration method in stopes where drilling large diameter is used to. detonate horizontal ...
Improving Productivity in Pillar Blasting HZL ... - Orica
The mine employs a sublevel stoping method with vertical crater retreat (VCR) to provide the initial void required for blasting. VCR blasts are employed in 2.5-meter (8.2 ft) lifts while long hole raises can be blasted in one firing. The relatively small size of the VCR raise blasts can impede the rate of production
Vertical Crater Retreat: an Important New Mining Method
INTRODUCTION The introduction of 165-mm (61/z-in.) holes to underground mining operations has made possible the application of Canadian Industries Ltd's (CIL) vertical crater retreat (VCR) mining method, illustrated in the accompanying sketches.
(PDF) Ch. 74 / Techniques in Underground Mining …
Vertical crater retreat mining Like sublevel stoping and shrinkage stoping, vertical crater retreat (VCR) mining is applicable to mineralization in steeply dipping strata. However, it uses a different blasting technique breaking the rock with heavy, concentrated charges placed in holes ("craters") with very large diameter (about 165 mm ...
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Sublevel stoping mining method pdf - Australian …
· The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR). 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 of the mine.
VERTICAL CRATER RETREAT - ResearchGate
Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO. Today, VCR is an established mining …
8.3.2: Shrinkage Stoping | ABC 123: Testing Site …
The variant is known as the vertical crater retreat (VCR) mining method. It was invented by mining engineers working in the nickel mines in Canada. The company, INCO or International Nickel Company as it was known, obtained a …
Major Mines & Projects | Pilar (Caraiba) Mine
The Pilar UG Mine has previously employed the following mining methods: Sublevel Stoping, VRM and Vertical Crater Retreat ("VCR"). VRM is the method currently employed, whereby ore is removed from the stope after it is blasted and cemented paste backfill is pumped into the mined stopes to ensure geotechnical stability prior to advancing to ...
Baselining Vertical Retreat Mining as a Mining Method
· VRM is a contraction of "Vertical Retreat Mining", however it has other names as well - as sophisticated as "Vertical Crater Retreat" or "VCR" or simply called "Inverted Crater Blasting". In 1983, it was called "an achievement of the last decade and is practiced in mines in Australia, Europe, Central America, and the U. S.
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· VCR().pdf, （ VCR ） 1. (Vertical Crater Retreat mining method) VCR, ...
Study on the long-hole raising technique using one blast ...
This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method. VCR method has been an established mining method being practiced in various mines all over the world. 8 An offshoot of this mining method is the VCR drop-raising technique that employs the same spherical crater charge technology as VCR method.9, 10 This ...
Vertical Crater Retreat - VSIP.INFO
Vertical Crater Retreat Blasthole mining is a general term applied to mining methods that employ long hole drilling for the production of ore. In most Blasthole methods the ore is blasted into a vertical opening. The blastholes may be small diameter long hole carbide drill holes or larger diameter holes drilled with in-the-hole (ITH) drills, or ...
Major Mines & Projects | Mopani Operation
Underground mining operations started in 1931 with the oldest operating shaft being Central Shaft. The mining methods used include Vertical Crater Retreat ("VCR"), Sub-Level Caving ("SLC"), and Longitudinal Room and Pillar ("RAP"). Mufulira.
Vertical Crater Retreat - VSIP.INFO
1. 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 that have competent, steeply dipping ore and host rock. VCR is based on the crater blasting technique in which powerful explosive charges are placed ...
Vertical crater retreat - QueensMineDesignWiki
VCR VCR(Vertical Crater Retreat mining method)[1-2],1974,,。
12. Mining methods and method selection
· 12.4 Underground mining method •Vertical crater retreat (VCR) stoping-Applied to the cases where conventional shrink stopingis feasible although narrow orebodywidth (< 3 m) may not be tractable, or to the cases where sublevel development is difficult or impossible.-Use of long and subverticalblast holes eliminates the need for entry of
Study on the long-hole raising technique using one blast ...
· cratering theory. This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method. VCR method has been an established mining method being practiced in various mines all over the world [8]. An offshoot of this mining method is the VCR drop-raising technique that employs the same spherical crater charge technology as ...
Vertical Retreat Mining (VRM) or Vertical Crater Retreat …
· Background. VRM is a contraction of 'Vertical Retreat Mining', however it is also known as 'Vertical Crater Retreat' or 'VCR' or sometimes simply called 'Inverted Crater Blasting'. In 1983, it was called 'an achievement of the last decade' and is practiced in mines in Canada, Australia, Europe, Central America, and the U.S.
Geotechnical factors - QueensMineDesignWiki
· Artificially supported methods include bench-and-fill stoping, cut-and-fill stoping, shrink stoping, and vertical crater retreat (VCR). Cut-and-Fill Mining. Cut-and-fill mining is a very versatile method that can be adapted to an …
Underground Mining and Its Methods - BusinessTech
· Vertical retreat mining (VRM) is a selective mining method that is used to divide mines into vertical zones. It is also known as Vertical crater retreat (VCR). It divides the mines with a depth of about 50 meters. Open stopping, a bottom-up mining technique is used in this method. Block Caving. It is one of the bulk mining methods.