>Vertical Crater Retreat | PDF | Mining | Science
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
>Damage Characteristics of Surrounding Rock Subjected to ...
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 China, the VCR blasting shock characteristics under different …
>
>(PDF) Ch. 74 / Techniques in Underground Mining TECHNIQUES ...
Vertical crater retreat mining Like sublevel stoping and shrinkage stoping, vertical crater retreat (VCR) mining is applicable to mineralization in steeply dipping strata. However, it uses a different blasting technique breaking the rock with heavy, concentrated charges placed in holes ("craters") with very large diameter (about 165 mm ...
>Underground Mining Methods - UFRGS
Underground Mining Methods and Applications FIGURE 1.3 Post room-and-pillar mining mined out Numbers indicate sequence of extraction FIGURE 1.4 Step-room mining of inclined orebody Deposits with large vertical heights are mined in slices. Mining starts at the top below the hanging wall. At this stage,
>Underground Mining and Its Methods - BusinessTech
Vertical retreat mining (VRM) is a selective mining method that is used to divide mines into vertical zones. It is also known as Vertical crater retreat (VCR). It divides the mines with a depth of about 50 meters. Open stopping, a bottom-up mining technique is used in this method. Block Caving. It is one of the bulk mining methods.
>BLASTING TECHNIQUES IN HIGH PRODUCTION UNDERGROUND …
The major innovation in Vertical Crater Retreat (VCR) method is of blasting. In this method, horizontal slice blasting of ore body with …
>Shrinkage and Vertical Crater Retreat Stoping
6) Vertical Crater Retreat (VCR) stoping 8 9. VCR - Vertical Crater Retreat 10. Vertical Crater Retreat (VCR) or Vertical Retreat Stoping: configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore, leading them to the base of …
>Study of Two-Step Parallel Cutting Technology for Deep ...
Z. Rao and S. Cai, "The blasting test and blasting vibration monitoring of vertical crater retreat mining method in the luohe iron mine," Geotechnical and Geological Engineering, vol. 34, no. 4, pp. 1047–1056, 2016. View at: Publisher Site | Google Scholar
Underground mining (hard rock) - WikiMili, The Best ...
VRM/ VCR: Vertical retreat mining (VRM) also known as Vertical crater retreat (VCR) is a method where mine is divided in vertical zones [clarification needed] with depth of about 50 meters using open stoping, bottom-up mining.
>Escalante Silver Mine – Western Mining History
mining method is end-slicing, a variation of vertical crater retreat mining. comment (geology): volcaniclastic host rock is post-middle miocene in age and fills east-north east trending graben structure . comment (deposit): mining currently in progress ; info.src : 1 pub lit; 2 unpub rept
>Vertical Retreat Mining (VRM) or Vertical Crater Retreat (VCR)
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.
>Shrinkage and Vertical Crater Retreat Stoping
10. Vertical Crater Retreat (VCR) or Vertical Retreat Stoping: configuration method in stopes where drilling large diameter is used to detonate horizontal slices of ore, leading them to the base of the block being mined.
>Study on the raising technique using one blast based on ...
The new blasting method developed into a new mining method called Vertical Crater Retreat. Its application in pillar recovery and in primary stopes has resulted in the elimination of raise boring ...
>(PDF) Shrinkage stoping and Vertical Crater Retreat stoping
8. VCR - V ertic al Cra ter R etr eat. V ert ical Crater Retreat (VCR) or V ertical Retreat Stoping: configuration method in stopes where drilling large …
>(PDF) Underground mining Methods - ResearchGate
Underground Mining Methods. Soft rock Mining Methods. Blast mining. Shortwall mining. Coal Skimming (or Sink and Fl oat) method. Hard rock Mining Methods. Stoping. 1) Room and pillar. 2) Bench and ...
>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. All these factors favour a VCR method in a deep mining environment.
>Lesson 6.3: The Design of Blast Rounds | ABC 123: Testing ...
crater blasting: used in the vertical Crater Retreat (VCR) mining method; cast blasting: adaptation of bench blasting used in certain area surface applications, predominantly in the Powder River Basin surface coal mines. In past lessons, we've defined some key terms for the design of a blast round. By way of review, these included the following:
>
>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 Best Methods for Underground Mining - Industry Tap
The vertical crater retreat mining method is also known as VCR mining. This mining method precipitously dips strata for mineralization. This method blasts rocks with total and heavy charges with a large diameter of 165 mm. VCR's blasting creates a cone-shaped opening in the targeted rock mass to let the materials be mined quickly.
1undergroundMiningMethods.pdf - MN 372 Underground Mining ...
TABLE OF CLASSIFICATION OF STOPING METHODS BY ROCK STRENGTH a) Stopes which are Naturally Supported 1. Open Stoping a) Stopes in small orebodies b) Sublevel stoping c) Open stopes with pillar support e.g. Room and Pillar stoping, Panel stoping, etc. d) Vertical Crater Retreat Stoping (VCR) Method e) Vein Mining Method b) Stopes which are Artificially …
>VCR Method_2018.pdf - MINE 411 Underground Mining …
Area of Application The VCR method is used in mining steeply dipping narrow to medium large deposits where the country rock and ore are strong and competent and can stand unsupported throughout the entire span of the stope. The VCR method makes use of a unique blasting technique – crater blasting.
>Vertical Crater Retreat - VSIP.INFO
CASE STUDY ON VERTICAL 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, steeply dipping ore …
>Surface Mining | PDF | Surface Mining | Mining
Surface mining is the predominant exploitation method worldwide. In the USA, surface mining contributes about 85% of all minerals exploitation (excluding petroleum and natural gas). Almost all metallic ore (98%) and non-metallic ore (97%), and 61% of the coal is mined using surface methods in the USA (Hartman and Mutmansky, 2002).
>Types of Mining Methods | Sell Side Handbook
Vertical crater retreat is another variation of long-hole stoping and is used for ore bodies that are steeply dipping. Depending on the type of ore body, the appropriate variation is selected. Shrinkage Stoping. Shrinkage stoping is an overhand mining method that is used for self-supporting vertical ore bodies.
Plastic limit bearing calculation of blasting-roof in deep ...
In other countries, deep hole mining is widely used due to its high efficiency and safety . This approach, specifically the Vertical Crater Retreat (VCR) mining method, was introduced in China in the 1980s. After decades of development, the VCR method has become the epitome of efficient and safe mining.
- vertical toller mill type classifired
- quality aggregates amp use of vertical shaft impactor
- millrite by powermatic vertical mill model mvn
- vertical cement roller mill manufacturer in china
- vertical roller mill supplier in india
- sala flotation vertical cell
- ball fly ash vertical roller mill preventive maintenance
- The Use Of Vertical Roller Mill In The Industry Ustaadkhan Articles
- For Sale Vertical Mill Th
- Vertical Roller Suspension
- Product Temperature Using Vertical Roller Mills
- Vertical finish versus horizontal finish on machine parts
- vertical mill mill grinding mill
- operation performed oncnc vertical machining centre
- production rate of vertical cement mill
- Vertical Roll Mill Roll
- vertical shaft impact crushers books
- What Is The Working Principle Of Vertical Roller Mill Seperator
- oscillating grinding machine vertical stone
- vertical raw mill design specification
- 19752 coal mill vertical roller mill
- working principle of vertical roller mill operation losch
- Design A Vertical Roller Mill
- cement vertical crusher
- vertical mills company
- Vertical Grinding Include
- vertical raw mill manual