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Vertical crater retreat VCR, also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut.
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 Canada, Australia, Europe, Central America, and the U.S.
Shrinkage and Vertical Crater Retreat Stoping 1. Hassan Z. Harraz hharraz2006 2014 2015 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors.
This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, longhole open stoping or blasthole stoping, and vertical crater retreat VCR. Variations of this method include vein Alimak mining, transverse stoping, Avoca and longitudinal 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 39cratering39 effect of an explosive charge being blasted close to the end of the hole.
Primeras importantes indicaciones antes de cargar el explosivo en una chimenea de minera subterrnea con mtodo de crter vertical en retroceso.
CASE STUDY ON VERTICAL. CRATER RETREAT MINING. BY SUJAN DALBEHERA DEVGAN SINGH ABHAYA MISHRA. 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
The method in turn has required a change in materials handling to cope with the greatly increased productivity. This paper presents an overview of vertical crater retreat mining in the Sudbury area using examples from several producing mines.
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
The mining methods that will be reviewed under this section are Sublevel Open Stoping, Vertical Crater Retreat Stoping, Sub level Caving and Block Caving methods. II2A. SubLevel Open Stoping This type of mining method applies to large ore zones that are characterized by relatively regular ore waste contacts and good ground conditions.
VRM VCR Vertical retreat mining VRM also known as Vertical crater retreat VCR is a method where mine is divided in vertical zones with depth of about 50 meters using open stoping, bottomup mining. Longhole largediameter holes are drilled vertically into the ore body from the top using inthehole ITH drills, and then blasting
V ert ical Crater Retreat VCR or V ertical Retreat Stoping configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore, leading them to the base of
Vertical crater retreat is another variation of longhole 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 selfsupporting vertical ore bodies.
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
The Vertical Crater Retreat VCR mining method was used to mine two rib pillars at New Broken Hill Consolidated Limited NEHC mine at Broken Hill. Experience gained in a trial VCR pillar stope was applied to the design of Panel 3CN pillar P3CN. Restricted access and a central sandfilled plug in this pillar necessitated the
This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, longhole 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 60 of all
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