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Aug 04, 2011· Posts about vertical crater retreat (VCR) written by PARTHA DAS SHARMA. ... Vertical Crater Retreat (VCR) method. View this document on Scribd. Posted in blasting, explosives, mining | Tagged blasting in underground metal mines, underground metal mines, vertical crater retreat ...
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 stopes.
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.
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.
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
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.
VERTICAL CRATER RETREAT MINE MODEL. The VCR mining method is used on vertical or steeply dipping ore bodies under similar conditions for sublevel stoping and shrinkage stoping. Downthehole drills are used for production, with small jumbos used for drift development. LHDs move the ore.
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
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.
In order to ensure the safety of the residence and the underground tunnel cavern within the mobile belt of the underground mining, the Luohe iron mine did the blasting test on the vertical crater retreat mining method and blasting vibration monitoring. The blasting experiments use common emulsified oil explosives and nonelectric initiation system.
Largediameter (6 1/2in) blastholes were an integral part of the stoping method at each mine. 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.
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.
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Start studying Underground Mine Design Test 1. Learn vocabulary, terms, and more with flashcards, games, and other study tools.
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
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 UT3 ... mechanized cutandfill and vertical crater retreat. occurred.
Mining and Minerals Engineering: University: ia Polytechnic Institute And State University ... Applications appropriate for Vertical Crater Retreat steep dip (over 45 degrees)large vertical extent ... higher risk for damaging surrounding rock than SLOS methoddilution. Generated by List View: Terms Definitions Hide All 7 ...
Geotechnical aspects of vertical crater mining method in a . 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.
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.
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 .
Nov 12, 2017· Primeras importantes indicaciones antes de cargar el explosivo en una chimenea de minería subterránea con método de cráter vertical en retroceso.
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.
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 utilizes large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes.
Initial material will be recovered at a rate of about 5,000 tonnes per day by conventional truck and shovel surface mining from both the Tom and Jason deposits. During the third year, production will transition to underground mining using Avocastyle sublevel retreat longhole (LH) stoping, vertical crater retreat (VCR) and alimak stoping.
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