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 From the .
For limiting the damage range caused by explosive shock loads in vertical crater retreat (VCR) mining, the blasting damage characteristics of surrounding rock were studied by two methods: numerical simulation and ultrasonic testing Combined with the mining blasting in Dongguashan Copper Mine of China, the VCR blasting shock characteristics under different conditions are obtained by using .
The charging/blasting techniques for VCR are much more complex than SLOS, with a higher risk for surrounding rock damage But the development work for VCR is much less than SLOS, and larger stopes can be mined Name 2 (of 4) naturally supported mining methods Room and Pillar; Sublevel Open Stoping (SLOS) Vertical Crater Retreat (VCR) stoping .
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
Mining retreats horizontally as successive vertical slices are blasted Vertical block mining is the term most often used for this method In VBM the workplace is divided into a series of vertical blocks and the blocks may be nined on a retreat basis working from the ends of the workplace
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, bottom-up mining
Τέλος μελετάται η περίπτωση εφαρμογής της μεθόδου VCR σε συνδυασμό με την παραγωγή και τις σφαιρικές γομώσεις σε κοίτασμα Au/CuThis thesis deals with the underground mining method of Vertical Crater Retreat (VCR) which has been developed .
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
VCR stoping STUDY PLAY VCR Vertical Crater Retreat stoping applications orebodies with steep dip large vertical extent 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 of stope walls
This course refers to the generic mining method of sublevel stoping The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR) Variations of this method include vein (Alimak) mining, transverse stoping, Avoca and longitudinal 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 ,
Drop Raising in Mining (VCR) Method copper mining India (1980 Drop Raising in Mining (VCR) Methods of Stopes ( Extraction of Ore) Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the More details » Get Price More stoping methods The Northern Miner
Aug 04, 2011· vertical crater retreat (VCR) , Blasting in High Production UG Metal Mines workings – 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 (VCR,
View Vertical Crater Retreatpdf from ADMINISTRA 1 at Autonomous University of Sinaloa Chapter 11 Vertical Crater Retreat: an Important New Mining Method LC ,
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
VCR - Vertical Crater Retreat Looking for abbreviations of VCR? It is Vertical Crater Retreat Vertical Crater Retreat listed as VCR , Mining methods using up-dip vertical crater retreat with post-fill are being examined in order to improve mining recovery and , vertical conveyor; Vertical Crater Retreat; vertical crest of internal .
Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes .
Dec 11, 2017· Aprende el método práctico para medir el cráter invertido, en tus avances en el desarrollo de una chimenea en VCR , Cut and Fill Mining Method 3D Animation - Duration: 6:36
VRM / VCR: Vertical retreat mining (VRM) also known as Vertical crater retreat (VCR) is a method where mine is divided in vertical zones with depth of about 50 meters using open stoping, bottom-up mining Long-hole large-diameter holes are drilled vertically into the ore body from the top using in-the-hole (ITH) drills, and then blasting .
The thickness varies from 8 to 14 m 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 Over the last ten years the method has been continually modified to improve safety and maximise ore production
Large-diameter (6 1/2-in) 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
What kinds of minerals are mined using vertical crater retreat Products As a leading global manufacturer of crushing, grinding and mining equipments, we offer advanced, reasonable solutions for any size-reduction requirements including, What kinds of minerals are mined using vertical crater retreat, quarry, aggregate, and different kinds of minerals
Nov 12, 2017· Primeras importantes indicaciones antes de cargar el explosivo en una chimenea de minería subterránea con método de cráter vertical en retroceso , Chimenea en VCR primeros Tips antes de .
Guide to Underground Mining Methods and Applications , mining method Mount Charlotte mucking Olympic Dam operator production stopes rail rail track Raise Climber recover remote control requires rock bolting rock drill rock mass rockdrill room and pillar shaft slice SLOS step room Sublevel caving Sublevel Open Stoping Sublevel stoping surface .
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) It is a very selective mining method that most commonly .
Oct 23, 2014· Shrinkage and Vertical Crater Retreat Stoping 1 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
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 cut-and-fill and vertical crater retreat occurred
Vertical Crater Retreat (VCR) Con Relleno Características del método Yacimiento Relleno final del caserón Bajo factor de carga Autosostenimiento Queen's Conclusiones VCR Principio Método mecanizado Perforaciones en abanico Barrenos de gran diámetro No requiere de chimeneas
Definition of vertical crater retreat i A blasting method employed in underground sublevel mining Initially a vertical slot extending across the width of the stope is mined The remaining portion of the stope is then blasted by section into the vertical slot following sublevel procedur