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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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 ...
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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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Topic 5: Underground Mining Methods Shrinkage stoping Vertical Crater Retreat stoping Hassan Z. Harraz hharraz2006@yahoo 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.
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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 ...
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The blasting test and blasting vibration monitoring of vertical crater retreat mining method in the Luohe iron mine [J]. Geotechnical and Geological Engineering, 2015, 34: 1047–1056. Article Google Scholar XU H L, YANG T H, ZHU L K. The studying on reasonable thickness of the boundary pillar during transferring open-pit into underground ...
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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 …
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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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2.2.4 Vertical Crater Retreat. Vertical crater retreat method (VCR) is used at the deposits that have competent steeply dipping ore hosted by the competent wall …
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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 …
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The Borska Reka copper mine is located in eastern Serbia. The FAHP decision method has been used to select the mining method leading to the selection of Vertical Crater Retreat (VCR) as the superior method (Bajic et al., 2020). 3.1.4. Zambia mine3.1.4.1. Konkola east ore body
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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. Watch this video (3:01) created by demonstrating sublevel stoping mining method.
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Vertical Crater Retreat (VCR) Mining. Vertical Crater Retreat (VCR) mining is an underground mining method primarily used for large, steeply dipping ore bodies, particularly those with tabular or pipe-like shapes. It is commonly employed in the extraction of ore deposits such as copper, nickel, and platinum.
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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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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 bottom …
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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 meters using a bottom-up mining technique. After ore blasting occurs, retrieval will take place at the bottom of the developed section.
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The vertical crater retreat method of mining was first introduced at Mindola mine in the late-1980s following several trials that helped define the design criteria for its application. …
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This document discusses various techniques for raising, which is the vertical or steeply inclined excavation that connects different levels in underground mines. The key raising techniques discussed include open raising using drilling and blasting in short lengths, compartment method which divides the raise into sections, Alimak raise climber ...
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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 …
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The method on the 'cratering' effect of an explosive charge being blasted close to the end of the hole. Mining retreats vertically as successive horizontal slices are blasted. In the case of narrow stopes where hole deterioration is a problem, a slot is brought up at one end of the block via cratering and the remainder of the block is slashed ...
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Soft rock Mining Methods. Blast mining. Shortwall mining. Coal Skimming (or Sink and Float) method. Hard rock Mining Methods. Stoping. 1) Room and pillar. 2) Bench and Fill (B & F) stoping. 3) Cut ...
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of Vertical Crater Retreat Mining Method in the Luohe Iron Mine Zhenbin Rao . Sijing Cai Received: 10 September 2015/Accepted: 29 April 2016/Published online: 4 May 2016 Springer International Publishing Switzerland 2016 Abstract Because the land requisition and demol-ishing became difficult more and more, the mining
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2.2.4 Vertical Crater Retreat. Vertical crater retreat method (VCR) is used at the deposits that have competent steeply dipping ore hosted by the competent wall rocks (Fig. 2.9). The ground conditions in general is similar to that of the SLOS method, however the VCR is technically simpler and allows to achieve a large production rate commonly ...
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from 800 thousand tonnes to 1.4 million tonnes in the Deeps section. Currently, the Deeps mining method employs up dip Vertical Crater Retreat method with waste rock as back fill material. The method has posed huge challenges in …
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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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November 2002 · The Israel Medical Association journal. Head louse infestations are prevalent worldwide. Over the past 20-25 years, 15-20% of all children in Israel between 4 and 13 years of age ...
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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 method is the VCR drop-raising technique that employs the same spherical crater charge technology …
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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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Synopsis. Vertical Crater Retreat is compared to other open stoping methods. Various geotechnical factors have been considered including the effects of stress concentration, …
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