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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.
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.
Discuss the geology, geometry and rock strength issues applicable to the vertical crater retreat mining method. (3 marks) Underground Mining Methods and Design 09MmpA2 May 2015 Page 3 of 13 Question (7 marks) answer compulsory General mine ventilation question. (7 marks)
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 .
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 Mining Method. We are a largescale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment.
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...
including mining sequence and blastinduced vibrations from production blasting. Sublevel stoping mining methods with delayed backfill are extensively used to exploit steeply dipping ore bodies by Canadian hardrock metal mines. Mine backfill is an important constituent of mining process. Numerical modelling of mine backfill
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.
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.
Start studying Mining Methods. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... Crater retreat stoping. a method of stope mining that allows for extraction of vertical deposits surrounded by incompetent rock mass (rock that cannot support itself) ...
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 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...
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,
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.
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 ...
Aug 04, 2011· Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting . ... Technical Papers; August 4, 2011 by PARTHA DAS SHARMA. Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method. ... explosives, mining and tagged blasting in underground metal mines, underground metal mines ...
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. Get Price; longitudinal retreat mining method essentialgapcoza
Shrinkage stoping Vertical Crater Retreat stoping. Underground Mining Mining and Blasting. The general conditions to which each of the principal stoping methods is applicable have been stated briefly in the preceding pages.
Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR) VRM is a contraction of ''Vertical Retreat Mining'', however it is also known as ''V ... dry way and wet way. Both methods can produce high quality manufactured sand as concrete aggregate. Especially, the dry way can produce not only the manufactured sand used in SMA ...
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 .
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.
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 largescale underground mining based on CW ~ivingston''scrater.
Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes ...
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