Discuss the geology, geometry and rock strength issues applicable to the vertical crater retreat mining method (3 marks) Underground Mining Methods and Design 09-Mmp-A2 May 2015 Page 3 of 13 Question 13 (7 marks) answer compulsory 13 General mine ventilation question (7 marks)
Vertical crater retreat mining Like sublevel stoping and shrinkage stoping, vertical crater retreat (VCR) mining is applicable to mineralization in steeply dipping strata However, it uses a different blasting technique breaking the rock with heavy, concentrated charges placed in holes (“craters”) with very large diameter (about 165 mm .
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 hol The orebody is mined.
vertical crater retreat mining method – Grinding Mill 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 large-scale underground mining based on CW ~ivingston'scrater
including mining sequence and blast-induced vibrations from production blasting Sublevel stoping mining methods with delayed backﬁll are extensively used to exploit steeply dipping ore bodies by Canadian hard-rock metal min Mine backﬁll is an important constituent of mining process Numerical modelling of mine backﬁll
More stoping methods - The Northern Miner Nov 8, 2004 , Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply dipping orebodi
vertical crater retreat mining method customer case Vertical Crater Retreat Underground Mining Method Vertical Crater Retreat (VCR) applies to ore bodies with steep dip and competent rock in both ore and host rock Read more Underground Mining Methods by sarah smith on Prezi
Feb 02, 2016· Topic 5: Underground Mining Methods Shrinkage stoping Vertical Crater Retreat stoping Hassan Z Harraz [email protected] 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
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 ,
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
Vertical Crater Retreat Part of the blasted ore will remain in the stope over the production cycle, serving as temporary support VCR was originally developed by the Canadian mining company INCO, and uses the crater blasting technique of powerful explosives in large diameter hol
vertical crater retreat mining method - necnowgong Vertical Retreatment Mining Method, Vertical Crater RetreatRitchieWiki, Vertical crater retreat is a beneficial mining method because it reduces the cost of Live Chat; method of statement for quarrying - assetcarecoin
Artificially supported methods include bench-and-fill stoping, cut-and-fill stoping, shrink stoping, and vertical crater retreat (VCR) Cut-and-Fill Mining Cut-and-fill mining is a very versatile method that can be adapted to an orebody with any shape (Bullock and Hustrulid, 2001)
Nov 02, 2011· Underground mining, Underground mining methods Lecture 4: Underground Mining 1 Hassan Z Harraz [email protected] 2010- 2011 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: an Important New Mining Method LC LANG INTRODUC'I'ION 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, illustrated in the accompanying sketch
Aug 04, 2011· 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 .
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 ,
Nov 23, 2012· Chapter 11 Vertical Crater Retreat: an Important New Mining Method LC LANG INTRODUC'I'ION the standard uphole method was used to blast down the The introduction of 165-mm (6% -in) holes to 18-m (60-ft) long section of waste from the bottom underground mining operations has made possible the of the ore into the undercut application of Canadian Industries Ltd's (CIL) vertical ,
Vertical Crater Retreat Mining in the Sudbury Basin AusIMM 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
The new blasting method developed into a mining method called Vertical Crater Retreat method Its application in pillar recovery and in primary stopes resulted in the elimination of raise boring .
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
Nov 12, 2017· Primeras importantes indicaciones antes de cargar el explosivo en una chimenea de minería subterránea con método de cráter vertical en retroceso
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 ,
MINING 324 SYLLABUS FS11 Underground Mining Methods and Equipment Instructor: Richard L Bullock, D Eng, PE, QP 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 (VCR) - Flashcards Flashcard Deck Information Class: MINE 3564 - Underground Mine Design , the spherical charge is positioned at a distance underneath and the detonation creates a crater shape opening in the rock , -higher risk for damaging surrounding rock than SLOS method-dilution Generated by Koofers List .
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
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 non-electric initiation system
of empirical and numerical methods The empirical methods included Potvin’s stability graph method for the estimating the stable span of Vertical Crater Retreat chambers and Grinstad/Barton graph method for estimating the support requirements Mining simulations using Phase 2 and Examine tab numerical modelling programs were carried out
vertical crater retreat mining method vcr Drop Raising in Mining VCR Method The VCR mining method is used on vertical or vrm mining method Mining Machine Contact Supplier vertical retreatment mining method stopes for narrow-vein vertical mining methods - Deswik stopes for narrow-vein vertical mining methods Designed specifically for use in .
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 stop The mining method used, possibly sublevel stoping or vertical crater retreat.