Vertical Crater Retreat Mining Method Pdf

vertical crater retreat mining method pdf

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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 into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut.



vertical crater retreat mining method pdf

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Vertical crater retreat (VCR) mining (Figures 1.14, 1.15, and. 1.16) is a method originally developed by the Canadian mining. Chat Online Caving Underground Mining Methods (longwall, Sublevel caving

vertical crater retreat mining method pdf

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Vertical retreat mining: In vertical retreat mining the stope does not take the shape of a vertical slot. Instead, the trough serves as a horizontal slot, and only short lengths at the bottoms of the blastholes are charged with explosives, blowing a horizontal slice of ore downward into the…



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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 advance of production blasting. Accordingly, the

Vertical crater retreat mining method pdf
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vertical crater retreat mining method pdf

Blasting in High Production UG Metal Mines workings

Mining method selection is a critical point and a strategic issue in the mining engineering process. Selection of a method unsuitable for deposit characteristics may make exploitation of the orebody troublesome and sometimes uneconomical. So, available deposits should be evaluated carefully in an optimum manner. In the process, the selection of the most appropriate mining method is of great

vertical crater retreat mining method pdf

Characterization and empirical analysis of block caving

Vertical Crater Retreat (VCR) Vertical or subvertical blastholes are drilled downward from the top level to the bottom level. A cuboid of orebody can be excavated from the lower level upward by a number of horizontal slices using the same blastholes (Figure 18).

vertical crater retreat mining method pdf

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CHAPTER 1 Underground Mining Methods and Applications Production Headframe Hans Hamrin* 1.1 INTRODUCTION Ore is an economic concept. It is defined as a concentration of

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* Medida inicial de los barrenos. * Tapar / sellar el fondo de los barrenos. * Cebado y carguío de los barrenos. * Medida de altura de la carga. * Sellado superior. * Conexión al tren de encendido en el nivel superior. *Se fundamenta en la teoría de cráteres de C. Livingston.

vertical crater retreat mining method pdf

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Vertical crater retreat 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 because miners do not have to be …

vertical crater retreat mining method pdf

Characterization and empirical analysis of block caving

the spherical charge is positioned at a distance underneath and the detonation creates a crater shape opening in the rock -several holes are detonated at the same level creating a horizontal slice. ore is excavated in slices starting from the bottom and advancing upwards.

vertical crater retreat mining method pdf

A new model for mining method T selection of mineral

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.

vertical crater retreat mining method pdf

Blasting in High Production UG Metal Mines workings

The thesis describes the selective mining method adapted to tbis type of orebody, and subsequent measures taken to minimize ore dilution. For tbis study, the locations ofstress relaxation are taken as fallures zones. Therefore, these zones are more important since they are subjected to very low stresses which can provoke rock block sliding orlocal wall caving (tension failure). Tracing the

vertical crater retreat mining method pdf

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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 in large-diameter holes and fired. Part of the blasted ore

Vertical crater retreat mining method pdf - Longitudinal Retreat Mining Method cz-eu.eu

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