Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR)
In most underground mines using this method, holes are laid out usually as a 3m x 3m. (burden /spacing) pattern, to provide the required , for 165 mm boreholes and about 3.7m x 13.7 m for 200 mm boreholes. The word ‘Retreat’ in ‘Vertical Retreat Mining’ refers to the blasting progression.
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.
Vertical crater retreat mining in the Sudbury Basin,
01-09-1991· 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.
vertical retreatment mining method - eltabernaculoatlanta.org
18-01-2018· vertical retreatment mining method grupporoyal.it. Retreatment of Residues and Waste Rock SAIMM. Retreatment of Residues and Waste Rock D.W. Bosch 12.1 Introduction From the commencement of gold mining on the Witwatersrand in 1887 up to 1984, a total of approximately 4,2 billion tons of gold ore has been milled reduce the measured length of
(PDF) Shrinkage stoping and Vertical Crater Retreat stoping
Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes,
Vertical Crater Retreat | PDF | Mining | Science
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
vertical retreatment mining method
Vertical Retreatment Mining Method FELONA Mining . Vertical Retreatment Mining Method; Vertical Retreatment Mining Method sIn any discussion of methods of underground mining comparison one is repeatedly confronted with the difficulty of dealing with so many variable conditions it is not an exact science and in the choice of a method each varying factor has a
canada vertical retreatment mining method
canada vertical retreatment mining method. Canada:MiningLaws and Regulations 2021. ICLG -MiningLaws and Regulations -Canadacovers common issues inmininglaws and regulations – including the acquisition of rights, ownership requirements and restrictions, processing, transfer and encumbrance, environmental aspects, native title and land rights – in 15 jurisdictions...We
vertical retreatment mining method - pisanie-prac
sand mining spiral circuit vertical bovenindewolken. sand mining spiral circuit vertical 2 Nov 2011, A common method of mining such vertical ore bodies is stull stoping, The timber sets interlock and are filled with broken waste rock or sand fill, for they are not strong enough to support, form of a sheet that e.
Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR)
In most underground mines using this method, holes are laid out usually as a 3m x 3m. (burden /spacing) pattern, to provide the required , for 165 mm boreholes and about 3.7m x 13.7 m for 200 mm boreholes. The word ‘Retreat’ in ‘Vertical Retreat Mining’ refers to the blasting progression.
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.
vertical retreatment mining method - eltabernaculoatlanta.org
18-01-2018· vertical retreatment mining method grupporoyal.it. Retreatment of Residues and Waste Rock SAIMM. Retreatment of Residues and Waste Rock D.W. Bosch 12.1 Introduction From the commencement of gold mining on the Witwatersrand in 1887 up to 1984, a total of approximately 4,2 billion tons of gold ore has been milled reduce the measured length of
vertical retreatment mining method - pisanie-prac
sand mining spiral circuit vertical bovenindewolken. sand mining spiral circuit vertical 2 Nov 2011, A common method of mining such vertical ore bodies is stull stoping, The timber sets interlock and are filled with broken waste rock or sand fill, for they are not strong enough to support, form of a sheet that e.
vertical retreatment mining method - tatianasawicka
Vertical Crater Retreat Mining Method Mode Design . Vertical crater retreat mining method vcr vertical crater retreat method applies to orebodies with steep dip and petent 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.
Shrinkage and Vertical Crater Retreat Stoping
23-10-2014· 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. The method progresses vertically, as successive slices of ore are detonated. Vertical Crater Retreat (VCR) uses parallel,
canada vertical retreatment mining method
canada vertical retreatment mining method. Canada:MiningLaws and Regulations 2021. ICLG -MiningLaws and Regulations -Canadacovers common issues inmininglaws and regulations – including the acquisition of rights, ownership requirements and restrictions, processing, transfer and encumbrance, environmental aspects, native title and land rights – in 15 jurisdictions...We
Business Planning Group - Vale
1.3 Vertical Retreat Mining Vertical retreat mining (VRM) is a bulk method of mining used in most of Vale’s underground mines. It is a versatile method that can be used for longitudinal or transverse mining applications. VRM is best suited for ore dipping at 55° or greater and may be used in a variety of ground conditions, where the drilled
8.3.2: Shrinkage Stoping | ABC 123: Testing Site / Course
The variant is known as the vertical crater retreat (VCR) mining method. It was invented by mining engineers working in the nickel mines in Canada. The company, INCO or International Nickel Company as it was known, obtained a patent on the method, and until the patent expired near the end of the 20th century, INCO had exclusive use of this new method.
vertical retreatment mining method - Roboco
vertical retreatment mining method. 20 hours ago · The latest acquisitions cover 12 single-cellminingclaims, three patented claims and one leasehold property consisting of fourminingclaims covering a total area of around 4 square kilometres.
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.
vertical retreatment mining method - eltabernaculoatlanta.org
18-01-2018· vertical retreatment mining method grupporoyal.it. Retreatment of Residues and Waste Rock SAIMM. Retreatment of Residues and Waste Rock D.W. Bosch 12.1 Introduction From the commencement of gold mining on the Witwatersrand in 1887 up to 1984, a total of approximately 4,2 billion tons of gold ore has been milled reduce the measured length of
VCR Method_2018.pdf - MINE 411 Underground Mining Methods,
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
vertical retreatment mining method - tatianasawicka
Vertical Crater Retreat Mining Method Mode Design . Vertical crater retreat mining method vcr vertical crater retreat method applies to orebodies with steep dip and petent 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.
vertical retreatment mining method bcr
05-09-2020· Vertical Retreatment Mining Method sovica. Mining method truck shovel loader hydraulic mining.The year ended december 31, 2019 was a full year operation and revenue generation at the retreatment chrome of crocodile river mine.The companys targets for 2020, subject to capital availability include.The mafic rocks of the bic display a maximum vertical
8.3.2: Shrinkage Stoping | ABC 123: Testing Site / Course
The variant is known as the vertical crater retreat (VCR) mining method. It was invented by mining engineers working in the nickel mines in Canada. The company, INCO or International Nickel Company as it was known, obtained a patent on the method, and until the patent expired near the end of the 20th century, INCO had exclusive use of this new method.
(PDF) UNDERGROUND MINING METHODS | Timileyin Ayomide,
There are several methods for bulk underground mining, the most common being block caving, long hole open stoping, sublevel open stoping, sublevel caving and vertical-crater-retreat. 2.2.1 Block Caving Block caving is a large-scale production technique applicable to homogeneous ore bodies of large dimensions and most commonly steep to vertical ore bodies.
Mining method evaluation and dilution control in Kittilä mine
Mining method selection was performed by doing preliminary method selection with traditional mining method selection tools. This, 2.3.3 Vertical Crater Retreat (VCR)..... 12 2.3.4 Square Set Stoping and Stull Stoping,
Lesson 6.3: The Design of Blast Rounds | ABC 123: Testing,
crater blasting: used in the vertical Crater Retreat (VCR) mining method; cast blasting: adaptation of bench blasting used in certain area surface applications, predominantly in the Powder River Basin surface coal mines. In past lessons, we’ve defined some key terms for the design of a blast round.
Transverse longhole stoping - QueensMineDesignWiki
Transverse longhole stoping is a bulk mining method in which the long axis of the stope and access drifts are perpendicular to the strike of the orebody. Typically drawpoints are located in under-cut access drifts which extend from the footwall, and the free face is mined in a horizontal retreat from the hanging wall to the footwall.
