Sub Level Caving - YouTube
22.03.2007 · A method of underground mining operation. WORLDS BEST TREE FELLING TUTORIAL! Way more information than you ever wanted on how to fell a tree!
Chimenea en VCR primeros Tips antes de cargar …
12.11.2017 · Primeras importantes indicaciones antes de cargar el explosivo en una chimenea de minería subterránea con método de cráter vertical en retroceso.
Vertical Retreat Mining (VRM) or Vertical Crater …
VRM is a contraction of ‘Vertical Retreat Mining’, however it is also known as ‘Vertical Crater Retreat’ or ‘VCR’ or sometimes simply called ‘Inverted Crater Blasting’. In 1983, it was called ‘an achievement of the last decade’ and is practiced in mines in Canada, Australia, Europe, Central America, and the U.S. It was advertised as ‘a unique and revolutionary new ...
Shrinkage and Vertical Crater Retreat Stoping
Shrinkage and Vertical Crater Retreat Stoping 1. Hassan Z. Harraz [email protected] 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.
(PDF) Shrinkage stoping and Vertical Crater …
Shrinkage stoping Ascending method of mining Advantages and Disadvantages Vertical Crater Retreat stoping Introduction Application Developmental sequence of stopes Production How Cratering Works ...
Vertical Crater Retreat - digistar.mb.ca
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 blasted close to the end of the hole. Mining retreats vertically as successive horizontal slices are blasted. In the ...
Edumine | Mining courses | Professional …
This course refers to the generic mining method of sublevel stoping. The most commonly used sublevel stoping mining methods are sublevel open stoping, long-hole open stoping or blasthole stoping, and vertical crater retreat (VCR). Variations of this method include vein (Alimak) mining, transverse stoping, Avoca and longitudinal mining. Sublevel stoping accounts for more than 60% of all ...
VERTICAL CRATER RETREAT - ResearchGate
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 ...
Vertical Crater Retreat | Economic Geology | Mining
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 large-diameter holes and fired. Part of the ...
vertical crater retreat (VCR) – Mining and Blasting
04.08.2011 · vertical crater retreat (VCR) August 4, 2011 by PARTHA DAS SHARMA Blasting in High Production UG Metal Mines workings – Vertical Crater Retreat (VCR) method
Catatan Seorang Eksplorator: Mining Methods
The mining methods that will be reviewed under this section are: Sub-level Open Stoping, Vertical Crater Retreat Stoping, Sub level Caving and Block Caving methods. II-2-A. Sub-Level Open Stoping This type of mining method applies to large ore zones that are characterized by relatively regular ore- waste contacts and good ground conditions.
Vertical crater retreat mining in the Sudbury Basin ...
Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely by blasting and cratering the bottom of the drill holes. The ore body is mined from the bottom up. The method in turn has required a ...
Geotechnical aspects of vertical crater mining …
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 ...
Abstract - USGS
This method is not as popular as it once was. Sublevel stoping, vertical crater retreat (VCR), sublevel caving, and cut-and-fill are all methods that can be applied to ore bodies where shrinkage stoping is feasible. The model is valid.for operations with daily mining capacities of 100 to 6,000 st/d. Base-case cost model equations are in table ...
Vertical Crater Retreat Pillar Mining-A Case Study …
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 use of angled blastholes and blasting of the stope in two sections ...
Vertical crater retreat mining in the Sudbury Basin ...
Vertical crater retreat mining in the Sudbury Basin. Min. Sci. Technol., 13: 131-143. Faced with rising costs and lower metal prices, several Ontario base metal sulphide mines have changed their method of mining to vertical crater retreat mining. This is a bulk mining method that utilizes large diameter holes and mines successive cuts remotely ...
Vertical Crater Retreat Mining Method
Vertical Crater Retreat Mining Method. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and iron, glass, coal, asphalt, gravel ...
vertical crater retreat mining method
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.
OG Title - Centers for Disease Control and …
A true vertical crater retreat (VCR) method was used at the Homestake Mine, while a vertical bench mining method (VBM) was used at the Carr Fork Mine. Since there are no personnel in a VCR or VBM stope, all ground control including dimensioning of stopes and pillars and the layout of cable bolt assays or other artificial support must be done in advance of production blasting. Accordingly, the ...