mining: Blasthole stoping: In vertical retreat mining the stope does not take the shape of a vertical slot. Instead, the trough serves as a horizontal slot, and only short lengths at the bottoms of the blastholes are charged with explosives, blowing a horizontal slice of ore downward into the.
Aug 28, 2010· A few of the underground mining methods, such as, Avoca? and Vertical Crater Retreat (VCR?), have been patented resulting in new names for variations (Modified Avoca and Modified VCR). Moreover, different names are often applied to the same mining method (Blasthole Stoping and Longhole Open Stoping are frequently used to refer to the same ...
cycle of operations utilizing the vertical crater retreat (VCR) method of mining. Clearly show examples of the following in your sketch, "raise", ~~S~Ot~~ and "stope" In VCR, the term "crater" is used with reference to the work of Livingston. Describe how the drilling, explosive loading and blasting cycle in practical VCR mining
Planning for the various types of mining methods 3. Mining Methods Room and Pillar Stoping (RP) Sublevel Open Stoping (SLOS) Vertical Crater Retreat (VCR) Shrinkage Stoping; Cut and Fill Stoping (CF) Sublevel Caving Systems Block Caving Coal Mining Systems (includes hard rock Longwall methods) 4.
Vertical Crater Retreat (VCR) Stoping. Vertical Crater Retreat (VCR) stoping is a larger scale variant of shrink stoping, made possible by advancements in largediameter blasthole drilling technology and explosive design. It is applicable in many places where shink stoping is feasible, except for orebodies that are narrow in width (less than ...
Three Classifications of Mining Methods, based on rock strength Naturally Supported Artificially Supported Caving (failure of roof integral to extraction process) Naturally Supported Methods Room and Pillar Sublevel and Long hole open stoping Vertical Crater Retreat (VCR) stoping Shrinkage stoping
VCR Vertical Crater Retreat. Looking for abbreviations of VCR? It is Vertical Crater Retreat. Vertical Crater Retreat listed as VCR. ... Mining methods using updip vertical crater retreat with postfill are being examined in order to improve mining recovery and ... vertical coordination; Vertical Crater Retreat; vertical crest of internal ...
from mining method to mining method and, to a lessor extent, mine to mine. The adjustment factors we use (table 1) are the same as Camm's (1991). Table 1 Mine dilution and recovery factors. Mining method Cut and fill Room and pillar Shrinkage stope Sublevel longhole Vertical crater retreat Dilution factor % 5 5 10 15 10 Recovery factor % 85 85 90
1. Introduction VCR (vertical crater retreat) mining technology is widely used in mine engineering because it possesses many better features, such as higher efficiency and more simple operation. In the mining process, the blasting shock originating simultaneously from the rockfracturing blasting load also can damage surrounding rock.
vacancy vacant land VacquierSteenland method ... clay varved clay varves vashegyite vat vaterite vaughanite vauquelinite vauxite Vbob Vbox Vbucket conveyor elevator VCR ... auger drill vertical balance vertical chain conveyor vertical circle vertical collimator vertical component vertical crater retreat vertical crater retreat mining ...
Jun 23, 2000 ... MASTER OF MINERAL SCIENCES IN MINING ENGINEERING ... selected operations, namely stope drilling and raiseboring of Vertical Crater. Page 6. iv. Retreat (VCR) mining method. ... terms. The cost estimations were done using both rudimental and computer .... Types and Sources of Hole Deviation. More details » Get Price
Jun 25, 2010· as before. As mentioned, drilling is carried out from sublevel and is usually complete before slice blasting commences; the high level of efficiency and productivity is obtained with VCR method .
vertical crater retreat mining method. longitudinal retreat mining method . LONGHOLE LONGITUDINAL RETREAT MINING METHOD The mining . This mine utilised an early version of the vertical crater retreat mining method that was . Get Price And Support Online; Sublevel Caving Technique | Mining | Economic Geology
from 800 thousand tonnes to million tonnes in the Deeps section. Currently, the Deeps mining method employs up dip Vertical Crater Retreat method with waste rock as back fill material. The method has posed huge challenges in as far as excavation stability problems are concerned.
Vertical crater retreat mining at the Centennial Mine of Hudson Bay Mining Smelting Co., Limited ... The method seemed to offer some advantages and one slope at Centennial Mine was selected to be mined by VCR while production was maintained from bias thole trial slope was safe and showed lower development costs, reduced drilling ...
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 .
vertical crater retreat mining (VCR), strip mining and novel extraction methods such as hydraulic mining and borehole mining. Moreover, underground methods such as longwall may be performed in the retreat or advance mode and the ground control may be performed by caving or filling. Therefore choices in the mining method selection process are
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, bottomup mining .
Vertical crater retreat (VCR), also known as Vertical retreat mining, is an open stoping, bottomup mining method that involves vertically drilling largediameter holes into the orebody from the top, and then blasting horizontal slices of the orebody into an undercut.
Underground Mining Methods: Choice of methods of development and stoping and factors affecting the same; statutory provisions. Primary and secondary Development: ... Alimak and Joralift raising, longhole and vertical crater retreat (VCR) raising; Raise boring systems; ...
• 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
Vertical crater retreat mining in the Sudbury Basin ... VERTICAL CRATER RETREAT MINING IN THE SUDBURY BASIN Vertical crater retreat mining History The vertical crater retreat mining method is based on Livingston's crater blasting theories and was developed by Inco and CIL Inc. [14]. Get Price; Room and pillar mining Wikipedia