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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 ...
vertical crater retreat mining method customer case. Vertical Crater Retreat Underground Mining Method. Vertical Crater Retreat (VCR) applies to ore bodies with steep dip and competent rock in both ore and host rock.
Vertical Crater Retreat: an Important New Mining Method L.C. LANG INTRODUC'I'ION The introduction of 165-mm (6% -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.
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 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.
Definition of vertical crater retreat. i. A blasting method employed in underground sublevel mining. Initially a vertical slot extending across the width of the stope is mined. The remaining portion of the stope is then blasted by section into the vertical slot following sublevel procedures.
Mar 01, 2019· Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA. ... Vertical Crater Retreat (VCR) method. View this document on Scribd. Advertisements. Posted in blasting, explosives, mining | Tagged blasting in underground metal mines, underground metal mines, vertical crater retreat ...
Large-diameter (6 1/2 in.) blastholes were an integral part of the stoping method at each mine. A true vertical crater retreat (VCR) method was used at the Homestake Mine, while a vertical bench mining method (VBM) was used at the Carr Fork Mine. Since there are no personnel in a VCR or VBM stope, all ground control including dimensioning of ...
VCR - Vertical Crater Retreat. Looking for abbreviations of VCR? It is Vertical Crater Retreat. Vertical Crater Retreat listed as VCR. ... Mining methods using up-dip vertical crater retreat with post-fill are being examined in order to improve mining recovery and ... vertical conveyor; Vertical Crater Retreat; vertical crest of internal ...
vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining. Moreover, underground methods such as longwall may be performed in the retreat or advance mode and the ground control may be performed by caving or filling. Therefore choices in the mining method selection process are
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.
The Vertical Crater Retreat (VCR) mining method was used to mine two rib pillars at New Broken Hill Consolidated Limited (NEHC) mine at Broken Hill. Experience gained in a trial VCR pillar stope was applied to the design of Panel 3CN pillar (P3CN). Restricted access and a central sandfilled plug in this pillar necessitated the...
longitudinal retreat mining method - samatourfr. vertical crater retreat mining method 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 ...
What kinds of minerals are mined using vertical crater retreat Products. As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, What kinds of minerals are mined using vertical crater retreat, quarry, aggregate, and different kinds of minerals.
Vertical Crater Retreat (VCR) - Flashcards. Flashcard Deck Information. Class: MINE 3564 - Underground Mine Design ... Applications appropriate for Vertical Crater Retreat -steep dip (over 45 degrees)-large vertical extent ... -higher risk for damaging surrounding rock than SLOS method-dilution. Generated by Koofers. List View: Terms ...
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 dipping ore and host rock.
Vertical crater retreat (VCR) mining is a method originally developed by the Canadian mining company INCO. Today, VCR is an established mining method used .
Oct 23, 2014· Shrinkage and Vertical Crater Retreat Stoping 1. Hassan Z. Harraz hharraz2006@yahoo 2014- 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
VCR mining applicable to similar ore-rock conditions as Sublevel Open stoping VCR is technically simpler with DTH drilling compared to top hammer drilling DTH holes are straight with minimal hole deviations VCR charging is complex, techniques must be mastered by the charging team
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 mining.
This method is not as popular as it once was. Sublevel stoping, vertical crater retreat (VCR), sublevel caving, and cut-and-fill are all methods that can be applied to ore bodies where shrinkage stoping is feasible. The model is valid.for operations with daily mining capacities of 100 to 6,000 st/d.
VCR has gradually supplanted other mining methods until today about three- quarters of the Sudbury output is obtained using VCR. VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C.W. Livingston's crater blasting theories and was developed by Inco and ...
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 ...
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 techniques. Vertical shafts from the surface provide access to .
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