Crushing & Grinding Machines

Vertical Retreatment Mining Method

Vertical Crater Retreat VCR method - Mining and Blasting 4 Aug 2011 Weblog of Partha Das Sharma For Discussing Various Aspects of Mining Explosives and Blasting by PARTHA DAS SHARMA Read more December 2012 - International Tungsten Industry Association...

Evolution of Vertical Crater Retreat Mining at Mindola

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...

Crater Blasting

Crater blasting is a method of blasting used in an underground mining method called Vertical Crater Retreat VCR Explosive charges are placed in large diameter holes and fired The concentrated spherical charge is positioned at a specified distance from the horizontal free surface underneath and the detonation creates crater-shaped...

longitudinal retreat mining method

Drop Raising in Mining VCR Method - copper mining India 1980-2009 Metalliferous Mines and Mining Methods Mechanized Under Ground Mining and Mechanized Open Cast MiningVertical crater retreat VCR also known as vertical retreat mining VRM reduces the cost of mining wide steeply orebodi Read more...

Vertical Crater Retreat 34m7w1zp1846

CASE STUDY ON VERTICAL CRATER RETREAT MINING BY SUJAN DALBEHERA DEVGAN SINGH ABHAYA MISHRA 1 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...

Shrinkage and Vertical Crater Retreat Stoping

Shrinkage and Vertical Crater Retreat Stoping 1 Hassan Z Harraz hharraz2006 yahoo 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...

Underground mining hard rock

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...

Vertical Crater Retreat VCR Underground Mine Design

Vertical Crater Retreat VCR - Flashcards Flashcard Deck Information Class MINE 3564 - Underground Mine Design Applications appropriate for Vertical Crater Retreat -steep dip over 45 degrees -large vertical extent -higher risk for damaging surrounding rock than SLOS method-dilution Generated by Koofers List View Terms...

Design of underground mining with the VCR method

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...

Definition of vertical crater retreat

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 Ref SME 1 ii A variation of the sublevel stoping method that uses basic crater blasting models...

The Blasting Test and Blasting Vibration Monitoring of

Because the land requisition and demolishing became difficult more and more the mining scheme of Luohe iron mine was changed from caving method to filling method 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...

COAL AND METAL SURFACE AND UNDERGROUND MINING

Aug 22 2011 0183 32 For more on VCR mining method refer Blasting in High Production UG Metal Mines workings - Vertical Crater Retreat VCR method Sublevel caving Sublevel caving is applicable to mineral deposits...

Major Mines Projects

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...

A new model for mining method T selection of mineral

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...

Lecture 4 Underground Mining

HZ 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...

Study on the long

Sep 01 2018 0183 32 This method is called vertical crater retreat VCR or vertical retreat mining VRM method VCR method has been an established mining method being practiced in various mines all over the world 8 An offshoot of this mining method is the VCR drop-raising technique that employs the same spherical crater charge technology as VCR method9 10 This...

Drop Raising in Mining

Vertical crater retreat VCR also known as vertical retreat mining VRM reduces the cost of mining wide steeply orebodi The stope has a similar shape but instead of small longholes drilled in fans large blastholes are drilled vertically from a top sill to break through into a...

VERTICAL CRATER RETREAT

Vertical crater retreat VCR mining is a method originally developed by the Canadian mining company INCO Today VCR is an established mining method used...

MASTER S THESIS

at 25 years The mining method used for production at Mindola Shaft is a variation of sublevel stoping known as the Vertical Crater Retreat VCR method The ore body in Mindola is on average 12 meters wide with dip varying from 56 176 to 72 176 the ore is extracted in stopes and backfilling is employed...

Vertical Crater Retreat Pillar 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...

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 All these factors favour a VCR method in a deep mining environment...

Underground Mining

Topic 9 Mining Methods Part V- Underground Mining 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

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...

BLASTING TECHNIQUES IN HIGH PRODUCTION UNDERGROUND

Jun 25 2010 0183 32 The major innovation in Vertical Crater Retreat VCR method is of blasting In this method horizontal slice blasting of ore body with near spherical charges into the...

Numerical modelling approach for mine backfill

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...

Vertical Crater Retreat Mining Method

vertical crater retreat mining method 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 Download Free png Vertical crater retreat mining...

Damage Characteristics of Surrounding Rock Subjected to

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 LSDYNA...

Mopani Copper Mines

Vertical crater retreat VCR both caving and post-fill have been the predominant mining method utilised within the Nkana mine but is now being converted to a combination of sub-level caving SLC and open stoping techniqu Vertical shafts from the surface provide access to...

Techniques in Underground Mining

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...

Questions on Mining

In relation to underground metalliferous mining define a Recovery b Dilution What methods of sampling are available to determine each of the above Question 19 Detail the development and production sequence for a vertical crater retreat VCR stope In what situations can VCR...