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Mar 07, 2012· Under ground mechanized mining methods. Drop Raising in Mining (VCR) Methods of Stopes (Extraction of Ore). Hindustan Copper Limited has addressed the complex 'raising' operation in mining and developed and implemented Drop Raising techniques at 80 meters intervals which improved safety and led to faster and higher productivity.
Sep 01, 2018· 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 method.9, 10 This technique has vastly improved raise blasting safety because top loading no longer requires ...
Drop Raise in Mining, VCR Method of Stopes, Surpac Mining Software Trained. Experience. Mining Consultant Mining Consultant India. Sep 2009 – Present 10 years 10 months. Mining Consultant India - Mine Plan and Mine Design, Mining Software, ERP, Drilling .
Drop raising is commonly used world-wide in the development of rock and ventilation passes over a length of generally up to 60m in the vertical mode and around 15m in an almost flat mode (Refer graph 1 and 2 – Inclination and length matrix). Drop raising offers a safe method .
Aug 04, 2011· This entry was posted in blasting, explosives, mining and tagged blasting in underground metal mines, underground metal mines, vertical crater retreat (VCR). Bookmark the .
A scheme of multiple deck blasting based on vertical crater retreat (VCR) drop-raising method was designed for an abandoned cavity with 30-m cover. The lower 12-m cover was first blasted to ...
level stoping mining method. The average stope height is 25 meters but can be as high as 40 meters. The original long-hole open stoping method required 21 drill holes for opening a drop raise in each stope, using the same conventional long-hole rigs as that were used for drilling
Author: Mike Neumann, Neumann Engineering and Mining Services Inc. (NEMS) Date: May 2010 Shrinkage stoping is a mining method used for steeply dipping, narrower ore bodies with self supporting walls and ore. It is an overhand mining method that relies on broken ore being left in the stope to be used as the "working floor" and to support the walls.
Raising methods in metal Min, DROP RAISING IN MINING (VCR) METHOD The method of drop raising is an improvement over the method of raising through longholing, described earlier, blasted in a sequence with the help of delay detonators at a time from the surface when no worker is allowed to remain underground.
Aug 01, 2015· The raise is a type of excavation that can be constructed by the raise boring method. Raise boring is very important in the mining industry, and it is also applied to other underground engineering, such as water conduits, air shafts, elevator hoistways and cable shafts in hydropower stations and pumped-storage power stations, ventilation shafts ...
Mar 29, 2010· Johan Fourie, regional manager at AEL comments on the blasting of the inverse drop raise hole, "With the traditional box hole development method, it would take approximately 12 days to advance 15 metres before loading and blasting the hole. This process could take longer in some of the older gold mines where reef exposure is minimal.
Jun 16, 2018· DROP RAISING - INTRODUCTION Special method of charging of Explosives and blasting is done in stages from bottom level for excavation in slices. The charging and blasting of the holes is based on Vertical Crater Retreat (VCR) method. The raise is driven either vertically or with steeply inclined dip. Mucking of blasted material done from lower ...
Since 2003, the experts at iRing have been solely dedicated to the pursuit of optimizing underground drilling and blasting operations. What we have discovered is that when we turn the blast into a repeatable industrial process then the overall costs and environmental impact are reduced substantially, at the same time allowing for increased rates of production.
VCR drop-raising is actually. an o ff shoot of vertical crater retreat (VCR) mining method based on. Livingston's cratering theory. 8 ...
Raising methods in metal Mines - copper mining United Kingdom (1980. Raising methods in metal Min, DROP RAISING IN MINING (VCR) METHOD The method of drop raising is an improvement over the method of raising through longholing, described earlier, blasted in a sequence with the help of delay detonators at a time from the surface when no worker ...
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 187 Get Price.
Drop Raising in Mining (VCR) Methods of Stopes (Extraction of Ore). Hindustan Copper Limited has addressed the complex 'raising' operation in mining and developed and implemented Drop Raising...
a level (compare raise). 1.3 MINING METHODS 1.3.1 Introduction Once an ore body has been probed and outlined and sufficient information has been collected to warrant further analysis, the important process of selecting the most appropriate method or methods of mining can .
The mining method selected is determined by the size, shape, orientation and type of orebody to be mined. The orebody can be narrow vein such as a gold mine in the Witwatersrand, the orebody can be massive similar to the Olympic Dam mine, South Australia, or Cadia-Ridgeway Mine, New South Wales.The width or size of the orebody is determined by the grade as well as the distribution of the ore.
typical layouts and proposals, the drop raising technique and future applications. Similarly, the application of longhole blast hole drilling in tabular and massive orebodies is discussed with emphasis on the DTH application, advantages and disadvantages, limiting factors, typical layouts, the long hole stoping techniques and future applications.
In underground mining, a raise refers to a vertical or inclined excavation that leads from one level, or drift, to another. A raise may also extend to surface. There are four excavation methods for raises: Conventional or open raise; Long-hole or drop raise; Alimak
Drop Raising in Mining - read more VCR concept: The term crater in blasting terminology is applied for creation of a surface cavity in a rock mass as result of detonating an explosive charge into...
Drop Raising in Mining (VCR) Method. Drop Raising in Mining - read more. First Class Mines Manager Certificate. Haridwar, Uttarakhand. Independence Day Message 15 August 2009. India Independence Day. Indian Copper Complex. Indian Copper Complex - Old History. Indian Copper Complex Smelter Photo.
The raise climber is a vehicle that obviates ladder climbing and much of the difficulty of the manual method. This vehicle climbs the raise on a guide rail bolted to the rock and provides a robust working platform when the miner is drilling the round above. Very high raises can be excavated with the raise climber with safety much improved over ...
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