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vertical crater retreat mining method

Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR)

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.

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Vertical Crater Retreat

Vertcial crater retreat is a comparatively new method of blasthole mining in which only large diamter ITH holes are used to blast down horizontal slices of ore into an opening below the block of ore being mined. The method on the 'cratering' effect of an explosive charge being

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Vertical Crater Retreat Pillar Mining-A Case Study AusIMM

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...

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VERTICAL CRATER RETREAT.pptx 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 dipping ore and host rock.

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Shrinkage and Vertical Crater Retreat Stoping

Oct 23, 2014· 6) Vertical Crater Retreat (VCR) stoping 8 9. VCR Vertical Crater Retreat 10. 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 mined.

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Abstract USGS

vertical crater retreat mine model The VCR mining method is used on vertical or steeply dipping ore bodies under similar conditions for sublevel stoping and shrinkage stoping. Down-the-hole drills are used for production, with small jumbos used for drift development.

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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

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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

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Abstract USGS

vertical crater retreat mine model The VCR mining method is used on vertical or steeply dipping ore bodies under similar conditions for sublevel stoping and shrinkage stoping. Down-the-hole drills are used for production, with small jumbos used for drift development.

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Vertical Crater Retreat [34m7w1zp1846]

CASE STUDY ON VERTICAL CRATER RETREAT MINING BY: SUJAN DALBEHERA DEVGAN SINGH ABHAYA MISHRA 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

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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.

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Baselining Vertical Retreat Mining as a Mining Method

Baselining Vertical Retreat Mining as a Mining Method Baselining a Mining Method Vertical Crater Retreat (VRM) Baselining a process is not an easy task. One must get down on the ‘ground floor’ and document process structure from start to finish. A convenient method for representing a process and all of its components is simple flowcharting.

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Evolution of Vertical Crater Retreat Mining at Mindola

The vertical crater retreat method of mining was first introduced at Mindola mine in the late-1980s following several trials that helped define the design criteria for its application. Over the last ten years the method has been continually modified to improve safety and maximise ore production. For example, due to the weakness of some rock

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Vertical Crater Retreat Mining Method

vertical crater retreat mining method. 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 mining method Henan Mining

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POSSIBILITY OF APPLICATION OF BACKFILL METHODS WITH

3.3. 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 method can be regarded as a considerably safer form of

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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

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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

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Mopani Copper Mines Wikipedia

Vertical crater retreat is the predominant mining method while sublevel open-stopping and sublevel caving methods are also used. [26] In April 2011 Mopani announced its intentions to sink a new $295 million shaft at Mufulira, this should extend the life of the mine by some twenty-five years. [27]

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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.

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Vertical crater retreat mining in the Sudbury Basin

Sep 01, 1991· Vertical crater retreat mining in the Sudbury Basin. Min. Sci. Technol., 13: 131-143. Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining.

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(PDF) Shrinkage stoping and Vertical Crater Retreat stoping

V ert ical Crater Retreat (VCR) or V ertical Retreat Stoping: configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore, leading them to the base of

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Numerical modelling approach for mine backfill

including mining sequence and blast-induced vibrations from production blasting. Sublevel stoping mining methods with delayed backfill are extensively used to exploit steeply dipping ore bodies by Canadian hard-rock metal mines. Mine backfill is an important constituent of mining process. Numerical modelling of mine backfill

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