ivertical crater retreat mining method

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 ...

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Mopani Copper Mines

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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The Best Methods for Underground Mining

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

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 …

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Underground Mining Methods (3.1)

 · Mining Exploration Session 3.Professor Kazem Oraee

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v117n2a4 Value creation in a mine operating with open ...

stoping mining methods and, from surveys conducted at these mines, open stoping operations experienced dilutions of up to 20%, and occasionally more. Dilution of this magnitude has a significant economic impact on any mining venture. Research carried out in Australia by Capes (2009) came to the same conclusion. Dilution has a significant effect ...

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Drop raising in underground mines

 · DROP RAISING - INTRODUCTION Special method of charging of Explosives and blasting is done in stages from bottom level for excavation in slices. The charging and blasting of the holes is based on Vertical Crater Retreat (VCR) method. The raise is driven either vertically or with steeply inclined dip. Mucking of blasted material done from lower ...

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Longitudinal Retreat Mining Method

Longitudinal retreat mining method samatourfr vertical crater retreat mining method 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 largescale underground mining.

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Mining Methods Flashcards | Quizlet

Crater retreat stoping. ... a system of underground mining using large rooms for extracting multiple levels simultaneously of a vertical or steeply inclined ore vein. Strip mining (Open cast mining) ... a method of stope mining that allows extraction of vertical deposits that are surrounded by competent rock mass (rock that can support itself) ...

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longitudinal retreat mining method

Eagle Mine215 Кб. This method provides the cost advantages of bulk mining, while maintaining a degree of selectivity and operational flexibility. The majority of the stopes will be mined as transverse bench and fill stopes, with some thinner thickness zones of the orebody mined as longitudinal retreat …

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Types of Mining Methods | Sell Side Handbook

 · Vertical crater retreat is another variation of long-hole 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 self-supporting vertical ore bodies.

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

Background. 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 …

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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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NIOSHTIC-2 Publications Search

A 4-year study was conducted of the rock mechanics aspects of two underground hard-rock mine study stopes: (1) Anaconda Minerals Company''s Carr Fork Mine near Tooele, Utah, and (2) Homestake Mining Company''s Homestake Mine in Lead, South Dakota. 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

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Underground hard-rock mining

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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Underground Mining Methods (3.1)

Mining Exploration Session 3.Professor Kazem Oraee

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Question 1 Draw a diagram and use it to describe the ...

Transcribed image text: Question 1 Draw a diagram and use it to describe the development and production cycle of operations of shrinkage stoping mining method in hard rock. Indicated the type of drilling and hauling equipment used in the operation Question 2 Draw a diagram and use it to describe the development and production cycle of operations of Vertical Crater Retreat (VCR) mining Method ...

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Stability of stope structure under different mining methods

Domestic and foreign researchers have conducted numerous studies on mining methods and the stability of stopes [2, 3]. At present, the mining methods of metal ore bodies include continuous mining technology, filling mining technology, VCR (Vertical Crater Retreat Method) technology, and caving mining technology [4-6].

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Crater Blasting

Crater Blasting. Crater blasting is a method of blasting used in an underground mining method called Vertical Crater Retreat (VCR). Explosive charges are placed in large diameter holes and fired. The concentrated, "spherical" charge is positioned at a specified distance from the horizontal free surface underneath and the detonation creates ...

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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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Underground Mining Methods Handbook

Excavation Design and Mining Methods in the 1100 Ore Body, Mount Isa Mine, Australia. ... Vertical Crater Retreat: An important New Mining Method. Crater Blasting Method Applied to Pillar Recovery at Falconbridge Nickel Mines, Ltd.

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Abstract

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. LHDs move the ore.

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Stability of stope structure under different mining methods

Domestic and foreign researchers have conducted numerous studies on mining methods and the stability of stopes [2, 3]. At present, the mining methods of metal ore bodies include continuous mining technology, filling mining t echnology, VCR (Vertical Crater Retreat Method) technology, and caving mining technology [4-6].

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Plastic limit bearing calculation of blasting-roof in deep ...

 · In other countries, deep hole mining is widely used due to its high efficiency and safety . This approach, specifically the Vertical Crater Retreat (VCR) mining method, was introduced in China in the 1980s. After decades of development, the VCR method has become the epitome of efficient and safe mining.

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vertical crater retreat (VCR) – Mining and Blasting

 · vertical crater retreat (VCR) August 4, 2011 by PARTHA DAS SHARMA Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method

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Sublevel Stoping Mining Method

Black Diamond Drilling Services AustraliaDatabase

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The Best Methods for Underground Mining

 · The 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. VCR''s blasting creates a cone-shaped opening in the targeted rock mass to let the materials be mined quickly.

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Study on the long-hole raising technique using one blast ...

In Canada in 1975, mining company INCO developed a mining method based on Livingston''s cratering theory. This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method. VCR method has been an established mining method …

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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.

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Sub level open stoping mining method for the Remaja type ...

methods have been studied and compared respectively as part of Vertical Crater Retreat and Sub Level Stoping mining methods. Actually the latter method is not strictly Sub Level Stoping, because in order to minimize the risk of collapse of the hanging wall, which dips at 65°, the major part of the depleted

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VCR Method_2018.pdf

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 …

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Vertical Crater Retreat | 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.

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Definition of vertical crater retreat

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. Ref: SME, 1. ii.

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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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ISSN Print: ISSN Online: Optimization of stope recovery ...

Mining methods at Mufulira mine The current mining methods used at Mufulira mine are variants of Mechanized continuous retreat (2015). These mining methods (figures 2.1and 2.2) are essentially variants of sublevel open stoping method with delayed hanging wall cave referred to as Mechanized continuous retreat 1 (MCR1)

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Major Mines & Projects

The mining methods used include Vertical Crater Retreat ("VCR"), Sub-Level Caving ("SLC"), and Longitudinal Room and Pillar ("RAP"). Average underground production for the last five years is 3.4 million tonnes per annum ("Mtpa") of ore at 1.94 %Cu and 0.12 %Co.

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The Blasting Test and Blasting Vibration Monitoring of ...

 · Because the land requisition and demolishing became difficult more and more, the mining scheme of Luohe iron mine was changed from caving method to filling method. In order to ensure the safety of the residence and the underground tunnel cavern within the mobile belt of the underground mining, the Luohe iron mine did the blasting test on the vertical crater retreat mining method …

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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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Vertical crater retreat mining in the Sudbury Basin ...

 · 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. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely ...

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Lesson 8.3: Mining by Unsupported Methods | ABC 123 ...

The name of this method derives from this drawing off or shrinkage of the stope. A modern and important variant of this method is known as vertical crater retreat (VCR) mining. A few examples of commodities mined by this method include iron and palladium. Open stoping. This type of mining is used to recover steeply dipping orebodies in ...

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Vertical Crater Retreat

VCR - Vertical Crater Retreat. Looking for abbreviations of VCR? It is Vertical Crater Retreat. Vertical Crater Retreat listed as VCR. Vertical Crater Retreat - How is Vertical Crater Retreat abbreviated? ... Mining methods using up-dip vertical crater retreat with post-fill are being examined in order to improve mining recovery and dilutions ...

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