the block cave mining method - uk essays,block caving is a large-scale underground mining method applicable to the extraction of low-grade, massive ore bodies. with the amount of literature available on block caving this report identifies the need to provide a simple understanding of the process. understanding a production process of a block cave mine is an important aspect before getting.block_caving_method.pptx - block caving underground …,block caving is the mining method in which masses, panels, or blocks of ore are undercut to induce caving, permitting the broken ore to be drawn off below. if the deposit is overlain by capping or bounded by a hanging wall, it caves too, breaking into the void created by drawing the ore. this method is unlike sublevel caving, in that both the ore and the rock are normally involved in the caving. block caving is a.
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block caving offers lower operating costs than many open pit mining methods and, in many cases, lower environmental impacts. however, it is very capital- intensive, and one of the primary disadvantages is that it removes much of the supporting rock from under the overburden, which can lead to
the first use of a jaw gyratory crusher for metal mining in europe, and the first for primary crushing in a copper open-pit mine, is at geotechmin’s ellatzite copper near etropole in bulgaria. thyssenkrupp received an order for the supply of the key components of a new primary crushing station incorporating one bk 63-75 jaw gyratory crusher model which is scheduled to begin operating by year-end 2007.
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. block caving has proven to be cost effective but often delivers a relatively coarse run-of-mine material with unpredictable maximum lump size, which can be effectively
• block caving longwall mining is used in horizontal, tabular deposits (mainly coal), while the others have applications in inclined or vertical, massive deposits, a lmost exclusively metallic or nonmetallic. because the exploitation openings are intentionally destroyed in the progress of mining, the caving
primary gold deposits are formed from gold-bearing fluids at sites where the chemistry and transport to waste dumps or, in the case of the ore, to the crusher. underground mining is used where the depth of ore below the surface makes...
block caving and primary crushing feldspar crusher block caving and primary crushing is, production stone crusher is essential equipment in mining machinery, common stone crusher jaw crusher, mobile crushing plant, impact crusher, hammer crusher, used in a variety of ores, cement, refractories,glass raw materials, mechanism building .
process description. this design is a 2 stage crushing process, primary jaw crusher, secondary impact crusher and the vibrating screen. we apply the impact crusher as the secondary crusher is because the limestone is not hard and easy to crush. however, there are a few underground mines using block caving methods. crushing copper ore. the
draglines are a primary excavating tool used in many surface mining operations worldwide. this video describes the block caving process with 3d animation. this video shows the terex finlay i-130 impact crusher developed for mining, recycling, quarrying, and demolition purposes.
a method for determining the minimum practical energy for comminution was developed and is presented in this paper. an objective of the method was to determine experimentally the energy-breakage relationship for a wide size range in order to evaluate the energy performance of both crushing and grinding processes using one energy benchmarking value.
block caving and primary crushing we are a high-end mining machinery manufacturer in asia. the main production equipment includes crusher, sand making machine, ball mill, raymond mill, cement equipment and other products. get price; block caving and primary crushing.
new afton block caving video the mine is designed to process 11,000 tpd (4 mtpa) of ore at full capacity, recovering copper, gold, and silver. the mill processes a blend of primary, transition and supergene ores using conventional crushing, grinding, and concentration processes.
block caving. this is the large scale, high development, low cost mining method used (where applicable) in many enormous or low grade ore bodies. gravity fragmentation allows this mine plan the least control of any over muck size, and muck size distribution tends to vary widely from mine to mine as table i of section 2 indicated.
as the ore caves, there is both primary and secondary fragmentation (comminution) to help provide a lower cost mining method. as shown below, in a block caving operation, ore is drawn through a network of draw bells above the extraction level where ore is removed from drawpoints.
block caving design parameters (laubscher, 2001) 41 production requirmnts cavability primary fragment. drift spacing drawpoint interaction draw zone spacing/pillar drilling & blasting hauling crushing layout logistics excavation stability method of draw draw heights sequence – rate of draw
an in tro d u ctio n to blo ck an d pan e l cavin g allan moss, general manager rio tinto copper projects agenda context – why the interest in caving how block caving works and key technical considerations risks value drivers 1 march 2011 bmo capital markets 2011 global metals & mining conference 2 greater depths of mining 1 march 2011 bmo capital markets 2011 global metals & mining
block caving cave mining (both block caving and sub-level caving), which is currently used at petra’s underground mines in south africa is a well-established and safe mechanised mining method that was first introduced at kimberley, south africa in 1951.
of different sizes - a 1000 cubic meter block, an 8 cubic meter block and a 0.125 cubic meter block. the blocks are all assumed to be cubical in shape with aspect ratios equal to 1. on a volumetric basis, the coarsest (largest) 1- to 2-percent of blocks account for over 98-percent of the fragment-size distribution and a minimal amount of fines.
primary fragmentation: in situ block size secondary: • extension of pre-existing discontinuities • opening of filled and healed discontinuities • opening along bedding or schistocity planes • crushing under superimposed weight • failure of blocks under arching stress • abrasion of block corners
to simulate the effect on sag mill performance, these fragmentation curves were passed through a primary crusher model. as shown in the figure, the variation in mill feed (80% passing size, in mm) is evident as the cave propagates upward and the secondary fragmentation generates more fines and a
blocks 2 through to 3 are being exploited via a modified blasthole open stoping technique. blocks 1 and 2 were mined out while block 3 is nearing depletion in 2007. block 5 is currently in the pre-feasibility phase and is planned to be extracted using a mechanised block caving mining methods.
block caving offers the potential for high-volume, low-cost production usually, although not always, from low-grade deposits that could not be mined profitably by other methods. the system is fully automated with real-time draw control and transport from the drawpoints to primary crushing units. speaking at expomin 2012, the head of the
mass mining including block caving, incline caving, front caving, sub-level caving and sub-level retreat are the principal mining methods for primary diamond deposits worldwide. diamonds have only been mined on an industrial scale within the past 150 years, mainly as open pit mines.
it is the first natural caving operation and the deepest block cave in australia. ridgeway deeps was developed at a cost of a$525m by ausenco. the project involved construction of a block cave, extension of the existing underground ore-handling system (including two new primary underground crushers), development of bulk underground mining
each cut will be about 4-m (13-ft) in height. the top cut is driven under weak, virgin rock and will be maintained at a width of about 4-m. the intermediate and bottom cuts are mined under engineered, cemented backfill. this allows mining width to