Vertical Crater Retreat stoping. applications. orebodies with steep dip large vertical extent competent rock in both ore and host rock part of the blasted ore will remain in the stope over the production cycle serving as temporary support of stope walls. Crater Blasting technique.

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 CIL Inc. [14].

Aug 04, 2011· This entry was posted in blasting, explosives, mining and tagged blasting in underground metal mines, underground metal mines, vertical crater retreat …

Vertical Crater Retreat. Utilizes larger rotary drills like the Cubex to drill large diameter blast holes. It is a good drilling type for massive sulfide deposits, large disseminated deposits, or those locations that will be processing high tonnages.

Vertical Crater Retreat. Vertical Crater Retreat (VCR) applies to orebodies with steep dip and com­petent rock in both ore and host rock. Part of the blasted ore will remain in the stope over the production cycle, serving as temporary support.

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 from the bottom and advancing upwards.

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 draw.

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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 …

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.

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 stopes and pillars and the layout of cable bolt assays or other artificial support must be done in ...

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'scrater.

orebodies with steep dip large vertical extent competent rock in both ore and host rock part of the blasted ore will remain in the stope over the production cycle serving as temporary support of stope walls Crater Blasting technique ... Vertical Crater Retreat stoping. Full transcript.

(VCR) Vertical Crater Retreat, en español cráteres de retroceso vertical. Patentado en Canadá por la Minera Inco. Mina Levack (1974). Vertical Crater Retreat (VCR) Con Relleno Ing. Vanessa Anjoul Rodríguez. CI. V-19711534 Principio *Se fundamenta en la teoría de cráteres de C. Livingston.

Vertical Long-holes are drilled from drives developed in the ore between two levels. Ore is then blasted using a charge that occupies a relatively short length of the hole, some distance from the ...

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

Vertical crater retreat is a beneficial mining method because it reduces the cost of mining orebodies that are wide and steep. It also eliminates the need for a support system after the blasting occurs and increases mining safety because miners do not have to be …

Vertical crater retreat - MineWiki, Queen's Mine Design Project WikiFeb 7, 2014 Vertical crater retreat VCR, also known as Vertical retreat mining, is an …

One has two vertical crater retreat (VCR) stoping areas and the other a VCR area and a sub-level caving (SLC) area. Vertical crater retreat mining is Nkana Division's most widely used mining method, employed at all three shafts.

A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to investigate the practical blast performance.

View source for Vertical crater retreat. From QueensMineDesignWiki ← Vertical crater retreat. Jump to: navigation, search. You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in one of the groups: Users, approved.

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 ...

Notes on Vertical Crater Retreat Method† Crater Blast: This theory propounds that when a spherical charge is placed at an optimum depth below ground, it will break the maximum volume in the shape of an inverted crater. The optimum depth, N is obtained from the relationship:

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Nov 16, 2018· Vertical crater retreat - MineWiki, Queen's Mine Design Project Wiki. Feb 7, 2014 Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottom-up mining method that involves vertically drilling. Live Chat. Vertical Roller Mill repair - Castolin Eutectic.

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…

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 ...

Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA

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.

The mining method used, possibly sublevel stoping or vertical crater retreat, must involve fairly consistent development procedures and stope dimensions. Natural variability

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).