Vertical Crater Retreat Mining Method

blasting damage of vertical crater retreat (VCR) mining method,laying the theoretical basis for rational control of stopeboundaries and optimization of blasting parameters.

 · Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR) The word 'Retreat' in 'Vertical Retreat Mining' refers to the blasting progression. As each charge is loaded and detonated with this process repeated, the remaining ore to be blasted is "in retreat" upwards until a section of about 7 m to 17 m is left at the top of the stope.

a time, on retreat, and is cleaned using remoteloading LHDs. No personnel may enter these open stopes at any time. .939+51;2585(54: To investigate and document the behaviour of open stopes at Target mine, and to evaluate alternative open stope design methods, a comprehensive empirical database was established based on the open stope mining information, rock mass properties, rock .

Primary Mining Method SubLevel Longhole retreat. Information. DEVELOPMENT SEQUENCE The Diamond hill ore bodies and mine workings are in exceptionally solid unfractured rock and accordingly are amenable to low cost sublevel open stoping methods. Ore is transported to the Montana Tunnels mill facility by truck. There it is processed in a separate circuit designed for Diamond Hill ore. Most gold ...

 · Considers improvements in slot rising through vertical crater retreat, inverse drop rise, and raise boring; Devotes a chapter to rock mass characterization, since increases in sublevel spacing have meant that larger, unsupported stope walls must stand without collapsing ; Describes methodologies to design optimum open spans and pillars, rock reinforcement of development access and stope walls ...

mining (VRM). It involves drilling a raise bore or blasting a slot raise using large diameter boreholes. The production holes are then drilled off as parallel rows or rings. The typical procedure for mining a stope using the VRM method consists of raise boring (typically m in diameter), and then drilling production

Chapter 74, Mining has important economic, environmental, labour and social, Surface mining of coal is performed by a variety of methods depending on the, vertical crater retreat (VCR) mining is applicable to mineralization in steeply dipping strataMing Copper Mine, It hosts the former Ming and Ming west coppergold mines that,, The deposit will be mined using the longhole mining method ...

This method is used when host rock is reasonably competent and orebody is steeply dipping. Broken ore is left in place to support the walls of the stope until all of the broken ore is removed. An important varient of this method is known as vertical crater retreat (VCR) mining. Commodities mined by this method include iron and palladium.

Then the new blasting method developed into a new mining method called vertical crater retreat, and is gaining acceptance by the industry. Its appliion in pillar recovery and in primary stopes has resulted in the elimination of raise boring and slot cutting. Dilution of the ore by backfill material . Related Documents. Vertical Crater Retreat November 2019 30. Vertical Crater ...

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 blasting technique in which powerful explosive charges are placed in largediameter holes and fired. Part of the ...

View Vertical crater from MINE 101 at University of Nevada, Reno. Vertical crater retreat From QueensMineDesignWiki This article is about the orebody requirements and developmental steps

At present, the mining methods of metal ore bodies include continuous mining technology, filling mining technology, VCR (Vertical Crater Retreat Method) technology, and caving mining technology [46]. For example, T. M. Ermekovtakes [7] mine engineering obtains the key parts of pillar instability in the goaf and then analyzes the goaf stability. Zhao et al. [810], used FLAC 3D numerical ...

INTRODUCTION The introduction of 165mm (61/zin.) holes to underground mining operations has made possible the appliion of Canadian Industries Ltd's (CIL) vertical crater retreat (VCR) mining method, illustrated in the accompanying sketches. This unique and revolutionary new appliion of spherical charge technology (see the Appendix), when applied to primary stopes and pillar recovery ...

Underground mining method •Vertical crater retreat (VCR) stopingApplied to the cases where conventional shrink stopingis feasible although narrow orebodywidth (< 3 m) may not be tractable, or to the cases where sublevel development is difficult or impossible.Use of long and subverticalblast holes eliminates the need for entry of operating personnel into the developing mine void.After ...

At present, there are two mining methods that are in use at Mindola. These are the vertical crater retreat (VCR) and sublevel caving (SLC) method. Deep sections below 5500 ftL have been experiencing very high temperature ranging from 34 ̊C to 36 ̊C wet bulb and 37 ̊C to 39 ̊C dry bulb temperature. These high temperatures are mostly ...

vertical crater retreat mining method pdf Mining in Zambia Wikipedia. Research by the Overseas Development Institute on the taxes and fees in the Zambian mining sector during privatisation in the late 1990s and the subsequent boom in copper prices reviewed the taxes and fees for mining and compared it internationally for royalties and corporate income tax in other major mining countries.

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 blasting technique in which powerful explosive charges are placed in largediameter holes and fired. Part of the ...

VERTICAL CRATER RETREAT MINE MODEL. The VCR mining method is used on vertical or steeply dipping ore bodies under similar conditions for sublevel stoping and shrinkage stoping. Downthehole drills are used for production, with small jumbos used for drift development. LHDs move the ore. Development includes a haulage drift, raises for access to drill overcuts, undercut of the complete area ...