Vertical Crater Retreat Mining Method

Study on the raising technique using one blast based on the …

In the previous work reporting the results of preliminary study, method of vertical crater retreat (VCR) multiple-deck shots with different and smaller slice heights was used to excavate the raise in one blast. ... VCR drop-raising is actually an offshoot of vertical crater retreat (VCR) mining method based on Livingston's cratering theory. 8 ...

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Vertical crater retreat mining in the Sudbury Basin

This paper presents an overview of vertical crater retreat mining in the Sudbury area using examples from several producing mines. The paper reviews the history of vertical crater retreat mining, various methods of applying vertical crater retreat layouts, the development of in-the-hole drills capable of drilling the large diameter holes …

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Evolution of Vertical Crater Retreat Mining at Mindola Mine …

This paper discusses the technical and operational aspects of vertical crater retreat mining at Mindola mine during the last ten years. The changes in mining method are often …

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Underground Mining Method Selection Flashcards

Vertical Crater Retreat 2. Shrinkage stoping 3. Cut and Fill stoping 4. Tumbered stoping (square sets, stulls) Un-supported. Caving 1. Block caving 2. Sublevel caving 3. Longwall mining. Room and Pillar. Mining method. Describe room and pillar.

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Shrinkage stoping and Vertical Crater Retreat …

Then to verify the "standardized" method for calibrating LaModel, 47 deep cover pillar retreat case histories from 11 different mines were analyzed with the new calibration procedures.

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Vertical Crater Retreat Mining Method

vertical crater retreat mining method. 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 agenciesVCR ...

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Vertical Crater Retreat Method | PDF | Mining

Vertical Crater Retreat Method - Free download as PDF File (.pdf), Text File (.txt) or read online for free. This is an underground mining method which involve the creation of a crater during mineral exploitation

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vertical crater retreat mining method

Apr 14, 2021· 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 …

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CASE STUDY ON VERTICAL CRATER RETREAT MINING

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 placed …

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The Blasting Test and Blasting Vibration Monitoring of Vertical Crater …

The blasting test on the vertical crater retreat mining method and the blasting vibration were analyzed. It is estimated if the vibration damage possibly the surface buildings and related facilities of mine. Because the land requisition and demolishing became difficult more and more, the mining scheme of Luohe iron mine was changed …

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Research Study on Pillar Design for Vertical Crater Retreat …

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. Since there are no personnel in a VCR or VBM stope, all ground control including dimensioning of stopes and pillars and the layout of cable bolt assays or other artificial support must be done in ...

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Evolution of Vertical Crater Retreat Mining at Mindola Mine…

Mindola mine is currently the deepest mine in the Zambian copper belt. Stoping is currently active to 1330 m below surface with long range plans indicating future production from 1590 m level. The orebody is tabular and dips between 55o to vertical. The thickness varies from 8 to 14 m. The vertical crater retreat method of mining was first …

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Metal Mines Blasting | PPT

2. Precise long hole drilling allows for larger sublevel spacing and vertical crater retreat (VCR) mining which improves efficiency and productivity. 3. In VCR mining, parallel long holes are drilled and charged in horizontal slices which are blasted in a spherical pattern for effective fragmentation. Drilling is completed before slice blasting ...

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Vertical Crater Retreat

Vertical Crater Retreat Blasthole mining is a general term applied to mining methods that employ long hole drilling for the production of ore. In most Blasthole methods the ore is blasted into a vertical opening.

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9.3.2: Shrinkage Stoping | MNG 230: Introduction to Mining …

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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Vertical Crater Retreat | PDF | Mining | Industries

Vertical Crater Retreat - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. Vertical crater retreat is a method of blasthole mining where large diameter holes are drilled using in-the-hole drills to blast horizontal slices of ore into an opening below. The method exploits the cratering effect of explosives close to the end …

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Underground Mining

Study with Quizlet and memorize flashcards containing terms like VERTICAL CRATER RETREAT, SQUARE SET STOPING, ROOM AND PILLAR and more. ... This primitive mining method uses pure timber to mine in the weakest of rock masses. ROOM AND PILLAR. 3. Is a style of mining where drifts are driven in a chess board pattern …

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Vertical Crater Retreat: an Important New Mining Method

INTRODUCTION The introduction of 165-mm (61/z-in.) holes to underground mining operations has made possible the application of Canadian Industries Ltd's (CIL) vertical …

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Vertical crater retreat.pdf

Vertical crater retreat From QueensMineDesignWiki This article is about the orebody requirements and developmental steps involved in Vertical Crater Retreat planning and mining. 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 …

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Moving towards deep underground mineral resources: …

Vertical crater retreat stoping: the method is a larger scale of shrinkage stoping made possible by recent advancements in large-diameter explosive design. …

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(PDF) Underground mining Methods

The mining method used will depend on the characteristics of the orebody, particularly thickness

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Vertical Crater Retreat Mining: Methods Advantages

• Also known as Vertical retreat mining • Bottom up mining • Vertical drilling and horizontal slicing • Similar to longhole/ sublevel stoping but : – It is bottom up method rather than left to right – Doesn't require excavation of sublevel drifts before production – Thickness of each horizontal slice varies between 2-5m

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Geotechnical aspects of vertical crater mining method in a

Synopsis. Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of …

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Definition of vertical crater retreat

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. A variation of the sublevel stoping method that uses basic crater blasting models.

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9.3.2: Shrinkage Stoping | MNG 230: Introduction to Mining …

Shrinkage stoping is a vertical stoping method, conducted in a vertical or near-vertical plane, and at an angle greater than the angle of repose of the broken ore. A defining characteristic of shrinkage stoping is that most of the blasted (broken) ore remains in the …

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OPERATING COST ESTIMATION MODELS …

costs for the various mining methods used in extracting ore from underground metalliferous mines. The aim of such a study ... and vertical crater retreat mining techniques. Additionally, the impact of technical factors such as productivity, stope width, recovery, dilution and others, were investigated. ...

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Vertical Crater Retreat (VCR) Mining Method Explained

MN 372 Underground Mining Systems Course Instructor: Sylvester Yenzanya Students: UMaT BSc. III 1 CHAPTER 10 VERTICAL CRATER RETREAT (VCR) MINING METHOD 10.0 Introduction The Vertical Crater Retreat (VCR) method is basically an open stoping method which resembles shrinkage stoping. It was developed …

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A Review of Sublevel Stoping

vertical crater retreat are also analysed. Finally, key components of ... large excavations in which ring drilling is the main method of rock breakage. Ore dilution consisting of low-grade, waste rock ... Professor of Mining Geomechanics, Western Australian School of Mines, PMB 22 Kalgoorlie WA 6430. E-mail: [email protected] ...

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Underground Mining Exam 1 | Quizlet

Vertical Crater Retreat. Opening Development. 2 of 38. Definition •Minimize pre-production development •Minimize stope development (selective versus bulk mining methods). •Maximize gravity assist (underhand versus overhand). •Maximize natural support (partial extraction versus complete extraction).

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sbm vertical crater retreat mining method vcr.md

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A CASE STUDY ON VCR METHOD OF MINING

Adult mortalities were determined for every five in 60 min (closed method) and for every ten in 180 min (open method). The closed method showed the percent mortality was 45, 88, and 100 at 5, 10 ...

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

On the other hand, several blasting technique innovations have also improved the raising safety. 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.

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Vertical crater retreat mining in the Sudbury Basin

The paper reviews the history of vertical crater retreat mining, various methods of applying vertical crater retreat layouts, the development of in-the-hole drills …

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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 utilises large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes. The orebody is mined from the …

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(PDF) Mining Methods

Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes Production How Cratering Works ...

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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 blasted close to the end of the hole. ... Vertical block mining is ...

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vertical crater retreat mining method vcr

Keywords Iron mine Vertical crater retreat mining method (VCR) Blasting test Vibration monitoring 1 Introduction The initial design scheme of the Luohe iron mine was sub-level caving mining. In the collapse area, the requisition of lands were 2940 acres and the resettle-ment were about 3–4 villages. After 4 years of

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Vertical Crater Retreat | PDF | Economic Geology | Mining

60942218 Vertical Crater Retreat - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Vertical crater retreat is a method of blasthole mining that uses large diameter holes drilled with in-the-hole drills to blast horizontal slices of ore vertically downwards into an opening. Mining retreats vertically as successive horizontal slices …

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