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Vertical crater retreat mining in the Sudbury Basin ...

199191Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely by

VCR

VCR Vertical Crater Retreat mining method 12,1974,,

Vertical Crater Retreat digistar.mb.ca

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 blasted close to the end of the hole.

Vertical crater retreat mining in the Sudbury Basin ...

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. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes. The ore body is mined from the bottom up. The method in turn has required a change in materials

Vertical Crater Retreat Mining Method Mode Design

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 Vertical Crater Retreat Mining Method

Vertical Crater Retreat Mining Science

201745Vertical crater retreat VCR mining is a method originally developed by the Canadian

Vertical Retreat Mining VRM or Vertical Crater

2021226VRM 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

Baselining Vertical Retreat Mining as a Mining Method

2021226VRM 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.

Geotechnical aspects of vertical crater mining method

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.

VCR

VCRVertical Crater Retreat mining method12,1974,,

Vertical Crater Retreat Mining Method Mode Design

Vertical Crater Retreat Mining In The Sudbury Basi. 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 this is a bulk mining method that utilises large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes the orebody is mined

Vertical crater retreat mining in the Sudbury Basin ...

The safety aspect of vertical crater retreat mining has been of concern, and was the focus of a provincial inquiry. The benefits in improved safety are demonstrated through an analysis of various records kept by the mines and provincial agencies. Future trends can now be envisaged, particularly in relation to deep mining.

Vertical Crater Retreat Mining Science

201745Vertical 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

Vertical Retreat Mining VRM or Vertical Crater

2021226Background. 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.

Vertical Crater Retreat Pillar MiningA Case Study

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 use of angled blastholes and blasting of the stope in two sections.

Geotechnical aspects of vertical crater mining method

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.

VCR Method2018.pdf MINE 411 Underground

MINE 411 Underground Mining Methods Equipment Course Instructor: Prof. Raymond S. Suglo Students: UMaT BSc. III 1 VERTICAL CRATER RETREAT VCR MINING METHOD The Vertical Crater Retreat VCR method is basically an open stoping method which resembles shrinkage stoping. It was developed in Canada. Area of Application The VCR method is used in mining steeply dipping narrow

Vertical Crater Retreat Mining Method, Hot Products

Vertical Crater Retreat Mining In The Sudbury Basin Ausimm. 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 this is a bulk mining method that utilises large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes the orebody is mined

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

2009826vertical 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

VCR

VCRVertical Crater Retreat mining method12,1974,,

Baselining Vertical Retreat Mining as a Mining Method

2021226VRM 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.

Vertical Crater Retreat Mining Method

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. Read more. Underground Mining Methods by sarah smith on Prezi.

Geotechnical aspects of vertical crater mining method

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.

Vertical Crater Retreat Mining Method, Hot Products

Vertical Crater Retreat Mining In The Sudbury Basin Ausimm. 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 this is a bulk mining method that utilises large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes the orebody is mined

The Best Methods for Underground Mining Industry

2021414The vertical crater retreat mining method is also known as VCR mining. This mining method precipitously dips strata for mineralization. This method blasts rocks with total and heavy charges with a large diameter of 165 mm. VCRs blasting creates a

Types of Mining Methods Sell Side Handbook

2018311Vertical crater retreat is another variation of longhole stoping and is used for ore bodies that are steeply dipping. Depending on the type of ore body, the appropriate variation is selected. Shrinkage Stoping. Shrinkage stoping is an overhand mining method that is used for selfsupporting vertical

Mine Productivity Issues: A Case Study of Mopani

202015Vertical crater retreat VCR 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 of operations because drilling and blasting are carried out from above and there is no need for the miner to ...

Geotechnical factors QueensMineDesignWiki

2019628Artificially supported methods include benchandfill stoping, cutandfill stoping, shrink stoping, and vertical crater retreat VCR. CutandFill Mining. Cutandfill mining is a very versatile method that can be adapted to an orebody with any shape Bullock and Hustrulid, 2001. It is a very selective mining method that most commonly ...

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