Block caving mines require large horizontal extents that automatically cave when the orebody is undercut Large vertical extents ranging from 60 180m justify the use of level developments Grades should also be uniform In order for the rock mass to break there must be at least one horizontal and two vertical joint sets
Get PriceFigure 2 Diorite primary and secondary fragmentation using BCF The Core2Frag primary fragmentation estimates using drill hole data within Panels 6 9 in the Diorite rock type in the DOZ Mine are shown in Figure 3 0% 20% 40% 60% 80% 100% 0 001 0 01 0 1 1 10 100 1000 Cumulative percentage less than Block Size cubic meters Primary Secondary
Get PriceIf it had happened inside I could of used the 9V or AA adapter but neither are particularly ideal for caving Moral of story always carry a spare battery even if the primary battery has 20 hrs of runtime Over the yrs with experience with caving and bicycling I ve come to hate proprietary battery packs
Get Priceblock caving mining system applying increased diameter blastholes to break ore for the period since commission date; available drilling machinery at the mine; guarantee and actual service life of powder factors of the primary crushing kg/t are 0 75 in 2024 0 45 in 2024 0 39 in 2024 0 4 in 2024
Get PriceBlock caving mining is one of the most cost effective underground mining methods The method has particular relevance in the Chilean mining industry where approxi weight conveyor and a primary crusher Early crushing of the mineral was introduced to avoid grizzlies on ore passes and to allow proper operation on conveyors
Get PriceBy Admin July 27 2024 Category Free Essays Block caving is a large scale resistance excavation method applicable to the extraction of low grade monolithic ore organic structures With the sum of literature available on block undermining this study identifies the demand to supply a simple apprehension of the procedure
Get PriceBlock caving 50 Room and pillar Potash 75 Sub level caving 120 For mines where rock is transported through a decline using diesel powered truck haulage or there is no crushing of the mined rock Primary ventilation systems or networks are concerned with ensuring the flow of air through interconnected mine openings The overall
Get PriceBlock Caving with Continuous Haulage Block cave mining is a mass mining technique used in many underground mines around the world The innovative Cat Rock Flow System jointly developed with the Chilean mining company Codelco greatly improves productivity by making use of continuous haulage technology as compared to the conventional use of
Get PricePrimary Sources & E Books Block caving Large ore bodies of lower grade can be mined with the block caving method so called because mining occurs sequentially in segments or blocks 200 to 500 feet 60 to 150 meters wide A series of railroad tunnels is first constructed under the ore to be mined Crushing Washing and Grinding the Ore
Get PriceThis video describes the block caving process with 3D animation View Video Bruker s TWIN/TWIN Setup In this video expert from Bruker talks about the TWIN/TWIN setup used in D8 ADVANCE diffractometer Draglines are a primary excavating tool used in many surface mining operations worldwide It features both screening and crushing
Get PriceIn order for a block caving operation to be successful Predicting the cavability of a rock mass is an area of primary importance in block cave design The cavability of a rock mass is based on many not only in terms of overall mine ability but also in blasting fragmentation crushing and grade recovery 3 Rock engineering system
Get PriceThe fundamental difference between the methods is that block caving produces from the full orebody footprint while in panel caving the active caving zone moves across the panel ie while one end is being undercut the other end is producing Once a panel becomes depleted the adjacent panel is mined in sequence until the orebody is exhausted
Get PriceThe results indicated that an underground mine utilizing block caving methods had the best relative valuation and this option was selected as the basis for the PEA primary crushed material to
Get PriceNorthparkes in New South Wales for example was the first mine to use the standard indirect fed jaw gyratory crusher type BK 63 75 for a block cave mine Since the Northparkes installation the primary crusher design has become the standout solution for block cave mines taking run of mine ore extracted using this advanced method
Get PriceA semi quantitative geotechnical risk assessment shows that the block cave has the potential for improved engineering controls and reduced workforce exposure when mining at depth Pre conditioning of BC1 and BC2 is included in the mine design and schedule as a caving and seismic threat mitigation control Crushing and Grinding Flow Sheet
Get PriceAbandoned roadways and roof caving zones are commonly found in residual coal and can destroy the integrity of the coal seam and roof and crushing the supports The sudden instability of the coal pillars weakened its support of the main roof thus resulting in long key blocks across the RCZ and hinged roof structures which significantly
Get PricePANEL CAVING In document Under Ground Mining Method Page 162 181 Introduction In this section the term panel caving will be used to represent both block caving suggesting the mining of individual blocks and panel caving indicating a laterally expanding extraction There are a great number of variants of this system and it is
Get PriceFig 12 3 Block caving 12 2 Rock mass response to stopingactivity •Supported method full support room and pillar strong and resistant to crushing and degradation during draw crater retreat and cut and fill methods 12 4 Underground mining method •Vertical crater retreat VCR stoping a Primary stopes b secondary stopes 12
Get PriceThe 182 000 tonnes p a concentrator is also conventional and is primary crushing followed by SAG mills and ball mills with cyclone classification panel caving with pre undercut and block caving which have been adapted to overcome the serious rockburst problem which stopped mining some years ago on level 6 and threatened the future of
Get PriceIn most current block caving operations the broken ore is removed from the drawpoints by LHD vehicles although the Kimberley Underground mines still use the more traditional gravity based grizzly or slusher systems From the extraction level the ore is transported to the haulage level and out of the mine sometimes following underground
Get PriceOpen bench mining Sub level caving Mechanised block caving Conventional block caving Vertical crater retreat Mechanised fissure mining etc Settlers Sub level crushing plant Transfer house Primary stockpile Primary crushing Ore tip Tamrock long hole drill and more
Get Pricethyssenkrupp has developed a concept design for a new integrated in pit crushing and skip conveying system ideally suited to opencast mines The system is based on existing underground technology and is designed to eliminate or reduce the number of trucks transporting ore from the pit to the plant This will cut diesel costs significantly or
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Get PriceThe selected mining method for Carrapateena is block caving The orebody will be mined in two lifts of approximately 500 met res each with primary crushing underground and ore delivery to the plant via conveyor Figure 2 A mining rate of 12 4 million tonnes per annum is envisaged for the life of the mine after a three year ramp up period
Get Priceblock caving and primary crushing underground mining methods and equipment caving methods are defined as those associated w ith induced controlled massive caving of the ore body the overlying rock or both th e exploitation workings in caving methods are designed to collapse with intentional caving of the ore and/or host rock the three major …
Get PriceThe project also involved construction of an additional secondary crushing and regrind circuit The mine commenced full production from the block cave beneath the existing mine Ridgeway Deeps will be producing about 1 6 million ounces Moz of gold and 0 21 million tons Mt of copper over the eight year mine life
Get PriceThe concept centers on the use of an RF300 Rock Feeder beneath each drawpoint each with a capacity of up to 300 mt/h to push broken ore on to a 900 mt/h RM900 Rock Mover conveyor This in turn moves the ore to a primary crusher with belt conveyors being used for rock transport after that
Get PriceA typical block caving mine is developed by first driving a series of parallel haulage drifts below the ore body From the haulage drifts a series of raises are driven at a 45 degree angle
Get Pricenormalized block caving comminution models by R Gómez1 R Castro2 3 F Betancourt1 and M Moncada1 three stages can be identified in situ fragmentation and primary and secondary fragmentation The strength ratio between large and small blocks plays an important role in crushing McDowell and Bolton 1998; Wood and Maeda
Get PriceOct 02 2024· Source Mining Magazine September 2024 Sub level caving is a highly efficient top down underground bulk mining method Recent developments in sub level cave mining have advanced the understanding of the technique and its production performance which allow it to now be considered as a highly viable alternative to open stoping and in some cases even to block caving …
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