The Vertical Crater Retreat (VCR) technique was soon introduced to the mine with advice from Inco Tech of Canada. Pillar extraction at RajpuraDariba Mining methods using updip vertical crater retreat with postfill are being examined in order to improve mining recovery and dilutions and to increase production rates from this ore source.
• Large blast and mucking flexibility of a vertical crater retreat (VCR) method. 2 Goldex seismic monitoring system Extraction of the Goldex orebody uses a novel and aggressive open stoping mining method. It was felt that a highresolution seismic monitoring system would be essential to monitor the rock mass response to mining to
What does Medical Science VCR stand for? Hop on to get the meaning of VCR. The Medical Science Acronym /Abbreviation/Slang VCR means Vertical Crater Retreat. by
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 cutandfill and vertical crater retreat. occurred.
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Jun 25, 2010· BLASTING TECHNIQUES IN HIGH PRODUCTION UNDERGROUND METAL MINES By: Partha Das Sharma ... The major innovation in Vertical Crater Retreat (VCR) method is of blasting. ... BLASTING TECHNIQUES IN ...
Drop Raising in Mining VCR Method copper mining . Vertical crater retreat VCR also known as vertical retreat mining VRM reduces the cost of mining wide steeply orebodies 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 bottom sill on the sublevel below
Retreat mining Wikipedia. Retreat mining is the removal of pillars in the underground mining technique known as room and pillar mining.. In the first phase of room and pillar mining, tunnels are advanced into the coal or ore body in a rectangular pattern resembling city streets.
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. Live Chat. Open pit Mine Images, Stock Photos Vectors .
tional mining of the VCR reserves to the west of the shoreline. In order to allow the ... mining depths of 1200 m and vertical stresses at the range of 20 to 35 MPa. Having tested at low production rates from a total predeveloped orebody the mining methods employed will now develop a significantly ... mining method and the deployment of ...
Inco's commitment to Vertical Crater Retreat (VCR) mining has been particularly intense. The company has constantly reviewed and incorporated the latest in mining materials, equipment, blasting and filling methods, remote control and the like, and constantly refined VCR planning and design to ensure greater productivity and safety.
Vertical crater retreat (VCR), also known as vertical retreat mining (VRM), reduces the cost of mining wide, steeply orebodies. 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 .
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 .
Vertical Crater Retreat RitchieWiki. 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 .
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iii. Vertical Crater Retreat (VCR) Vertical or subvertical blastholes are drilled downward from the top level to the bottom level. A cuboid of orebody can be excavated from the lower level upward by a number of horizontal slices using the same blastholes (Figure 18). Spherical charges should be placed to obtain the maximum cratering effect.