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Nov 02, 2011· Harraz Presentation Mining Methods 29 30. 7) Vertical Crater Retreat (VCR) Stoping Vertical longholes are drilled from drives developed in the ore between two levels. Ore is then blasted using a charge that occupies a relatively short length of the hole, some distance from the bottom face. The method has a low explosive consumption. The ...
Vertical crater retreat mining in the Sudbury Basin. Min. Sci. Technol., 13: 131143. 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.
Eagle Mine215 Кб. This method provides the cost advantages of bulk mining, while maintaining a degree of selectivity and operational flexibility. The majority of the stopes will be mined as transverse bench and fill stopes, with some thinner thickness zones of the orebody mined as longitudinal retreat .
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.
longitudinal retreat mining method samatourfr vertical crater retreat mining method Vertical Crater Retreat Stoping as Applied at the Homestake, 28 Jul 2012, Therefore, the feasibility of applying the VCR stoping method at the Homestake Mine was explored Vertical Crater Retreat stoping is a recent innovation in largescale underground mining .
Baselining Vertical Retreat Mining as a Mining Method Baselining a Mining Method Vertical Crater Retreat (VRM) Baselining a process is not an easy task. One must get down on the ''ground floor'' and document process structure from start to finish. A convenient method for representing a process and all of its components is simple flowcharting.
Rock Mechanics Study of Shaft Stability and Pillar Mining, Homestake Mine, Lead, SD ... Rock Mechanics Study of Shaft Stability and Pillar Mining, Homestake Mine, Lead, SD (In Three Parts) 3. Geomechanical Monitoring and Modeling Using UTAH3 ... mechanized cutandfill and vertical crater retreat. occurred.
PDF | Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental .
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
longitudinal retreat mining method samatourfr. vertical crater retreat mining method Vertical Crater Retreat Stoping as Applied at the Homestake, 28 Jul 2012, Therefore, the feasibility of applying the VCR stoping method at the Homestake Mine was explored Vertical Crater Retreat stoping is a recent innovation in largescale underground mining ...
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, bottomup mining.
The proposed mine plan envisages a bulk mining operation with two mining methods: vertical retreat mining (VRM), and sublevel open stoping (SLOS). Uncemented waste rock backfill will be employed to fill the VRM stopes to provide hanging wall support to reduce mining dilution.
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 shrinkage draw. All these factors favour a VCR method in a deep mining environment.
Many methods of extracting ore in an underground mining context exist. The stope sequencing methods developed here are applicable to steeply dipping ore bodies that can be segregated into panels of stopes. The mining method used, possibly sublevel stoping or vertical crater retreat,
Vertical Crater Retreat: an Important New Mining Method LANG INTRODUC''I''ION The introduction of 165mm (6% in.) holes to underground mining operations has made possible the application of Canadian Industries Ltd''s (CIL) vertical crater retreat (VCR) mining method, illustrated in the accompanying sketches.
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
Oct 23, 2014· 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.
vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining. Moreover, underground methods such as longwall may be performed in the retreat or advance mode and the ground control may be performed by caving or filling. Therefore choices in the mining method selection process are
The Pilar UG Mine has previously employed or currently employs the following mining methods: Sublevel Stoping, VRM and Vertical Crater Retreat ("VCR"). Sublevel stoping, which is no longer planned for future development, is a method whereby the ore .
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.
MINING 324 SYLLABUS FS11 Underground Mining Methods and Equipment. Instructor: Richard L. Bullock, D. Eng.,, 217 Sunset Drive, Longview, WA I. COURSE DESCRIPTION Principles utilized to develop metallic, coal and industrial mineral deposits into productive entities using underground mining methods.
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 .
Mar 01, 2019· Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA. Mining and Blasting Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting . ... crater retreat (VCR) August 4, 2011 by PARTHA DAS SHARMA. Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method ...
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