# vertical crater retreat mining method

• #### vertical crater retreat (VCR) – Mining and Blasting

Aug 4, 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 . Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method

• #### Shrinkage and Vertical Crater Retreat Stoping SlideShare

Oct 23, 2014 Underground mining method Shrinkage stoping, Ascending method of mining, Advantages and Disadvantages, Vertical Crater Retreat stoping, Introduction, Applica

• #### Underground Mining Methods Explosives Engineering

MINE PLANNING LESSON. ·. General Mine Planning. ·. Mine Planning for the various types of mining methods. MINING METHODS LESSONS. ·. Four Lessons on Room and Pillar Stoping (R&P). ·. Review of the four R&P lessons. ·. Two Lessons on Sublevel Open Stoping (SLOS). ·. One Lesson on Vertical Crater Retreat

• #### 3.Underground mining capital and operating costs

Table 1. Mine dilution and recovery factors. Mining method, Dilution, Recovery. factor, %, factor, %. Open pit, 5, 90. Block caving . . . . . . . . 15, 95. Cutandfill, 5, 85. Roomandpillar . . . . . . 5, 185. Shrinkage, 10, 90. Sublevel longhole . . . . . 15, 85. Vertical crater retreat . . 10, 90. 'Assumes pillar extraction.

• #### Untitled

1.3 Discuss the geology, geometry and rock strength issues applicable to the vertical crater retreat mining method. 5 marks. Question 1.4 (6 marks) ' answer compulsory. 1.4 A general mine hoist question. 1.4.1 When choosing a type of hoisting rope, what are the two most important rope properties. 1.4.2 What is the most

• #### Vertical Crater Retreat (VCR) method Mining and Blasting

Aug 4, 2011 Blasting Techniques in Underground Metal MinesIn "blasting". NEW BURN CUT BLAST DESIGN IN DRIVES ENHANCES DRILLING & BLASTING EFFICIENCY WITH ECONOMY A CASE STUDYIn "blasting". Explosives and Blasting in Underground Coal MinesIn "blasting". This entry was posted in

• #### Vertical crater retreat QueensMineDesignWiki

Feb 7, 2014 Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut. A system of primary and secondary stopes is

• #### Geotechnical aspects of vertical crater mining method in a deep mine

Synopsis. 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

• #### Design and Appliion of Sublevel Stoping Methods Edumine

Feb 20, 2011 Introduction. This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, longhole open stoping or blasthole stoping, and vertical crater retreat (VCR). Variations of this method include vein (Alimak) mining,

• #### Vertical crater retreat QueensMineDesignWiki

Feb 7, 2014 Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut. A system of primary and secondary stopes is

• #### Review of:"Techniques in Underground Mining: Selections from

Section 2, Methods Requiring. Minimum Support, contains a number of papers including some on sublevel stoping, room and pillar method of openstope mining, vertical crater retreat as a mining method, cost calculations for sublevel longhole stoping, and cost estimation for sublevel stopoing. The third section entitled

• #### Mining method evaluation and dilution control in Kittilä mine Aaltodoc

May 5, 2014 mucked, including possible pillars. Methods are given colors to measure their applicability: green for applicable, red for not applicable and yellow for neutral. For further elaboration see 2.3 Discussion on Mining Methods. Sublevel open stoping. Cut and fill stoping. Vertical crater retreat. Stull stoping/.

• #### Vertical Crater Retreat RitchieWiki

Oct 20, 2009 A vertical crater retreat (VCR), also referred to as vertical retreat mining, involves drilling largediameter holes into the orebody vertically from the top of the mine, as opposed to the conventional blasthole stope method of drilling them in fans from bottom to top. Vertical crater retreat is a beneficial mining

• #### Challenges with Deep Mining

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° to 72°, the ore is extracted in stopes and backfilling is employed. The current production

• #### the university of zambia Unza

mining the Vertical crater retreat chambers at 25.25 meters strike length and supporting them with. 6 meters cable bolts and fibre reinforced shotcrete. Furthermore, adopting of a steeper stoping echelon is also recommended. This research gives the details of the problems of excavation instability, research methodology

• #### Shrinkage and Vertical Crater Retreat Stoping SlideShare

Oct 23, 2014 Underground mining method Shrinkage stoping, Ascending method of mining, Advantages and Disadvantages, Vertical Crater Retreat stoping, Introduction, Applica

• #### Overhand Stoping University of Saskatchewan

Vertical Crater Retreat / VCR. • Advantages. – VCR is a bulk, highcapacity mining method with good recoveries. – It is an efficient stoping method that is very susceptible to mechanization and can have productivities in excess of 32 tonnes/employeeshift. – It offers good wall support during the stoping phase by using.

• #### SHORT DELAY BLASTING IN UNDERGROUND MINING ppt video

19 Vertical crater retreat. Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the ore body from the top, and then blasting horizontal slices of the ore body into an undercut A system of primary and secondary

• #### Damage Characteristics of Surrounding Rock Subjected to VCR

Sep 28, 2014 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

• #### vertical crater retreat (VCR) – Mining and Blasting

Aug 4, 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 . Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method

• #### Underground mining (hard rock) Wikipedia

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, bottomup mining. Longhole largediameter holes are drilled vertically into the ore body from

• #### This Is Mining WV Mine Safety

dump unit for haulage to the shaft. The sublevel stoping method works only if the walls of the opening around the ore do not cave. The safety of this method relies on exposing personnel to a small tunnel opening that can be supported. Variations of the method include vertical crater retreat (figure 22) and blasthole mining.

Oct 18, 2010 47 FIGURE 2.21 I d e a l i z e d i s o m e t r i c drawing showing the "mass b l a s t " r e t r e a t f o r b l a s t h o l e open stope mining method. 49 FIGURE 2.22 Cross s e c t i o n o f the v e r t i c a l c r a t e r r e t r e a t method used i n b l a s t h o l e open stope mining, showing an i n i t i a l b l a s t, and the

• #### Vertical crater retreat Centre for Excellence in Mining Innovation

Feb 7, 2014 Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut. A system of primary and secondary stopes is

• #### Vertical Crater Retreat (VCR) method Mining and Blasting

Aug 4, 2011 Blasting Techniques in Underground Metal MinesIn "blasting". NEW BURN CUT BLAST DESIGN IN DRIVES ENHANCES DRILLING & BLASTING EFFICIENCY WITH ECONOMY A CASE STUDYIn "blasting". Explosives and Blasting in Underground Coal MinesIn "blasting". This entry was posted in

• #### Geotechnical aspects of vertical crater mining method in a deep mine

mining method in a deep mine. S. C. Goel. Zambia Consolidated Copper Mines Ltd, Zambia. SYNOPSIS. 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

• #### Geotechnical aspects of vertical crater mining method in a deep mine

mining method in a deep mine. S. C. Goel. Zambia Consolidated Copper Mines Ltd, Zambia. SYNOPSIS. 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

• #### Underground Mining Methods (3.1) YouTube

Jan 14, 2013 Mining Exploration Session 3. Professor Kazem Oraee.

• #### Underground Mining Methods Body

Vertical crater retreat (VCR) mining (Figures 1.14, 1.15, and. 1.16) 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 blasting technique

• #### The Blasting Test and Blasting Vibration Monitoring of Vertical

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

• #### The role of gravity flow in the design and planning of large sublevel

or vertical crater retreat (VCR). The optimal conditions Synopsis. Sublevel stoping (SLS) is one of the oldest and most used methods for underground mining. It relies heavily on the use of drilling and blasting techniques to remove design and planning of large sublevel stopes with and without vertical dilution, based on.

• #### Vertical Crater Retreat Mining Nature Scribd

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

• #### Vertical Crater Retreat RitchieWiki

Oct 20, 2009 A vertical crater retreat (VCR), also referred to as vertical retreat mining, involves drilling largediameter holes into the orebody vertically from the top of the mine, as opposed to the conventional blasthole stope method of drilling them in fans from bottom to top. Vertical crater retreat is a beneficial mining

• #### Mining Vertical Crater Retreat < Mining Methods InfoMine

Mining information: Vertical Crater Retreat. Also find mining business, people, countries, commodities, technology & research.

• #### A Framework for Stope Sequence Optimization Centre for

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, must involve fairly consistent

• #### Vertical crater retreat Centre for Excellence in Mining Innovation

Feb 7, 2014 Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut. A system of primary and secondary stopes is