This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR). Variations of this method include vein (Alimak) mining, transverse stoping, Avoca and longitudinal mining. Sublevel stoping accounts for more than …

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...

Underground Mining Methods (ENGR 2356) Assignment 2 Vertical Retreat Mining Method Due date: March 3, 2024 You are requested ... Describe the Vertical Retreat Method (VRM), advantages ... Section 1, pp. 3-14 & 34-37; Section 6, pp. 205 – 286 Trotter (1991) Vertical crater retreat mining in the Sudbury Basin. Mining Science and ...

Vertical Retreat Mining (VRM) or Vertical Crater . 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 …

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 crater …

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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 …

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.

VERTICAL CRATER RETREAT METHOD The application of this new and revolutionary and mining method has been possible only after down-the–hole drills were introduced to …

El documento describe el método de explotación VCR (cráteres verticales en retroceso) utilizado en la mina Monterrosas en Perú. Se realizó el desarrollo de niveles superiores e inferiores para preparar cámaras de perforación y recepción. Se perforaron taladros verticales de nivel a nivel y se cargaron y volaron en rebanadas descendentes. El material caía en la cámara inferior y se ...

VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on C.W. Livingston's crater blasting theories and was developed by Inco and CIL Inc. [14]. ... vrm vertical crater retreat - …

cratering theory. This method is called vertical crater retreat (VCR) or vertical retreat mining (VRM) method. VCR method has been an established mining method being practiced in various mines all over the world [8]. An offshoot of this mining …

Long-Hole Raising and Vertical Crater Retreat (VCR) or Vertical Retreat Mining (VRM) drop-raising are the established blast-hole raising techniques being practiced in various underground ...

A review of the factors controlling stope wall behaviour such as excavation geometry, rockmass strength, induced stress, ground support, blast damage and drill drive layout is undertaken. In addition, the advantages and disadvantages of single lift stope geometries linked to vertical crater retreat are also analysed. Finally, key components of multiple lift stoping such as cut-off slots ...

A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to ...

Método Vertical Crater Retreat (VCR) Aplicaciones del método V.C. El método V.C., es utilizado en excavaciones, tanto de producción como de desarrollo y su autonomía es hasta unos 70m. Su aplicación ha dado buenos resultados en términos de productividad, rendimiento, costos de operación y seguridad.

Este método desenvolvido pela INCO no Cana-dá, foi experimentalmente aplicado na mina Caraíba com consultoria sul-africana. É comum uma variante (VRM – Vertical Retreat Mining) em que a face livre é …

As va-riações do método ocorrem sob a forma de abertura de poços, túneis e galerias nos maciços das encaixan-tes ou aplicação de métodos ou técnicas mais sofisti-cadas como realce auto-portantes (câmaras e pilares, subníveis e VCR – Vertical). Crater Retreat; suporte das encaixantes; e abatimento em minas de grande porte; a ...

Geotechnical aspects of vertical crater mining method in a deep mine S. C. Goel Zambia Consolidated Copper Mines Ltd, Zambia SYNOPSIS 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

Download scientific diagram | -Vertical crater retreat mining method (, 2007) from publication: Possibility of application of backfill methods with cementing fill in ore body Borska ...

VERTICAL CRATER RETREAT VCR Se utiliza en cuerpos mineralizados de baja a mediana potencia y en rocas de mediana competencia (3B) • Se utiliza la técnica de cargas controladas en que el largo de la carga explosiva es menor a 6 veces el diámetro de perforación. Carga esférica • Este sistema de explotación requiere la construcción de ...

A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to investigate the practical blast performance. Charging and timing patterns were adjusted accordingly and the left 18-m cover was

Vertical crater retreat mining is being used at Zinc Corporation, Limited and New Broken Hill Consolidated, Limited for pillar recovery between previously mined and filled stopes. In order to increase productivity in the older lead lode areas of the mine, particularly in the lower grade sections around the keel of the orebody, score form of longhole stoping was considered …

10. 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, vertical, descending and spherical …

El método VCR (Cráteres Verticales en Retroceso) es un método de explotación minera que involucra la perforación de barrenos verticales u oblicuos desde un nivel superior hasta el inferior a través del cuerpo mineral, los cuales son cargados y detonados por secciones para extraer el mineral de forma ascendente. El mineral extraído cae por gravedad a una cámara inferior para …

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...

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Vertical crater retreat (VCR) is an underground mining method suitable for steeply-dipping orebodies. It involves drilling large-diameter holes vertically into the orebody and blasting horizontal slices into an undercut. Ore is then drawn from the stope through draw points. VCR creates downward-facing craters with each blast, allowing the broken ore to remain partially …

III. DESCRIPCIÓN DEL VCR, O CRATER RETREAT VERTICAL . Es un método desarrollado originalmente por la empresa minera canadiense INCO. Hoy en día, Crater Retreat vertical es un método de extracción establecida, que se utiliza en las minas de todo el mundo. Retiro cráter vertical se basa en la técnica de chorreado cráter.

The introduction of 165-mm (6% -in.) holes to underground mining operations has made possible the application of Canadian Industries Ltd's (CIL) vertical crater retreat (VCR) mining method, …

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 are blasted.

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 into the orebody …

Study with Quizlet and memorize flashcards containing terms like VCR Applications, Vertical Crater Retreat, is a method originally developed by, The introduction of ..... and advancements in ..... make this method possible. and more.

A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to ...

These acronyms stand for vertical retreat mining, which also refers to vertical crater retreat (VCR). This mining method divides the mines into vertical zones having a depth of 50 …

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 …