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Vertical crater retreat - QueensMineDesignWiki

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.

VERTICAL CRATER RETREAT - ResearchGate

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 …

vertical crater retreat mining method - guardianangels.co.za

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.

Research Study on Pillar Design for Vertical Crater ...

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.

Vertical Crater Retreat (VCR): Underground Mine Design ...

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.com. List View: Terms ...

vertical crater retreat (VCR) – Mining and Blasting

Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA. Mining and Blasting Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting . ... August 4, 2011 by PARTHA DAS SHARMA. Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method. View this document on ...

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, ...

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.

Design and Application of Sublevel Stoping Methods ...

The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR). Variations of this method include vein (Alimak) mining, transverse stoping, Avoca and longitudinal mining.

mining method retreat - perkinspreschool.com

Jul 12, 2018· Oct 20, 2009 Vertical crater retreat is a beneficial mining method because it reduces the cost of mining orebodies that are wide and steep. It also eliminates ... Mining method, Dilution, Recovery Sublevel stoping, vertical crater retreat (VCR), sublevel caving, and cut-and-fill are all methods that can be applied to ore. Contact Us.

Vertical crater retreat mining in the Sudbury Basin ...

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 ...

POSSIBILITY OF APPLICATION OF BACKFILL METHODS WITH ...

Vertical crater retreat mining method - VCR Vertical Crater Retreat method 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. This mechanized

A new model for mining method T selection of mineral ...

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

vertical crater retreat mining method - abwasseranlagen.eu

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.

Underground mining techniques - Universidade Federal do ...

Underground Mining Methods and Applications FIGURE 1.3 Post room-and-pillar mining mined out Numbers indicate sequence of extraction FIGURE 1.4 Step-room mining of inclined orebody Deposits with large vertical heights are mined in slices. Mining starts at …

Underground Mining Methods (3.1) - YouTube

Jan 14, 2013· Underground Mining Methods (3.1) Nikzad7. Loading... Unsubscribe from Nikzad7? ... Mining Exploration Session 3. Professor Kazem Oraee. Category Education; Show more Show less.

Techniques in Underground Mining - ILO Encyclopaedia

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 ...

Drop Raising in Mining (VCR) Method - copper mining India ...

Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply orebodies. ... Drop Raising in Mining (VCR) Method. Drop Raising in Mining - read more. First Class Mines Manager Certificate. Haridwar, …

VCR 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 stoping

Vertical Crater Retreat (VCR) con relleno by Vanessa ...

* Medida inicial de los barrenos. * Tapar / sellar el fondo de los barrenos. * Cebado y carguío de los barrenos. * Medida de altura de la carga. * Sellado superior. * Conexión al tren de encendido en el nivel superior. *Se fundamenta en la teoría de cráteres de C. Livingston.

Blasting in High Production UG Metal Mines workings ...

Aug 04, 2011· Mining and Blasting ... Technical Papers; August 4, 2011 by PARTHA DAS SHARMA. Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method. View this document on Scribd. Advertisements. Like this: ... ← Tunnel Construction Methods …

National Exams May 2015 09-MMP-A2, Underground Mining ...

cycle of operations utilizing the vertical crater retreat (VCR) method of mining. Clearly show examples of the following in your sketch, "raise", ~~S~Ot~~ and "stope" 3.2 In VCR, the term "crater" is used with reference to the work of C.W. Livingston. Describe how the drilling, explosive loading and blasting cycle in practical VCR mining

drop raising in mining vcr method - palmfruitoil.co.za

Vertical crater retreat (VCR) mining is a method originally developed by the Canadian VCR is based on the crater blasting technique in which powerful explosive . Lower development cost since it eliminates raise boring and slotcutting.

Creighton's VCR mechanics. - Free Online Library

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.

vertical retreatment mining method - samatour.fr

Vertical crater retreat is a beneficial mining method because it reduces the cost of mining orebodies that are Read More vrm vertical crater retreat - get more. Vertical Crater Retreat VCR …

VERTICAL CRATER RETREAT.pptx | Mining | Geology

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

longitudinal retreat mining method - greenrevolution.org.in

Drop Raising in Mining (VCR) Method - copper mining India (1980-2009) Metalliferous Mines and Mining Methods. Mechanized Under Ground Mining and Mechanized Open Cast Mining.Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply orebodies. Read more

Underground mining (hard rock) - Wikipedia

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.

Longitudinal Retreat Mining Method - uniqueevent.in

vertical crater retreat mining method vcr; vertical crater retreat (VCR) – Mining and Blasting. ... longitudinal retreat mining method - ... vertical crater retreat mining method longitudinal retreat mining method - … 16.1 LONGHOLE LONGITUDINAL RETREAT MINING METHOD The mining ...

vrm vertical crater retreat - abwasseranlagen.eu

vertical crater retreat mining method ... hoisting 50,000 t / week are hauled at shrinkage stoping vcr vertical crater retreat vrm vertical retreat mining . ... More Info Vertical Crater Retreat stoping by chuka anu on Prezi