- each sublevel is developed into drifts that penetrate complete ore section - spiral ramp connects sublevels - in narrow deposits, drifts parallel to strike - ore section above drifts is drilled with long holed fan pattern - drilling is done ahead of blasting - several sublevels can be drilled completely before blasting/production...
Mar 03, 2017· Experience from LKAB, Sweden - Sub-level caving (SLC) is an important mass mining method, used at LKAB The caved rock or debris at the SLC interface reduces the fragmentation and the swelling of the blasted ring and it dissipates the explosive energy These phenomena may immobilize the blasted ring, causing ore loss...
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Nov 22, 2019· Sublevel caving is a large scale mining method, suitable for large ore bodies with a steep dip and a rock mass where the host rock in the hanging wall will f....
From the ore production of all under- ground mines, the largest annual production of underground metalliferous mines in the world is caving methods The sublevel caving in Kiruna Iron Mine of Sweden has reached annual ore production over 20 million tons in 1974...
There is a method of development of ore deposits sublevel caving under the patent of the Russian Federation No 2208162, AS 41/22, publ in BI No 19, 2003, including on the horizons of the release openings: drifts, vectors and vent itself, carrying potatah drilling workings and the breaking of ore panels wells with formation of a temporary ....
properties of ore body, ore body above 3720m extraction level is selected as the first-mining scope and adopts block caving scheme of sublevel The maximum caving height is 370m and the average is 200m Caving height of world block caving mine is shown in table 1 Based on the engineering of...
May 31, 2021· Block caving and sublevel caving have in common that rock mass caves during the extraction of the ore body in a controlled way As a result regional stress changes, the formation of considerable abutment stresses, large-scale subsidence and significant seismic energy releases occur...
Oct 23, 2014· Figure shows sublevel caving is used to mine large orebodies with steep dip and continuation at depth 47 Design: transverse sublevel caving - this case, the galleries of production (drifts) are perpendicular to the strike of the ore; - Mining recoveries are greater than the longitudinal layout Prof Dr HZ Harraz Presentation Caving methods 47...
The removal of the ore causes a large gap or ‘cave’ where the orebody previously resided Specific examples of cave mining techniques include block caving, panel caving, inclined-drawpoint caving, cut and fill mining, shrinkage stopping, sublevel longhole mining, room-and-pillar mining and front caving Cave mining is typically used to mine ....
Mar 03, 2017· Experience from LKAB, Sweden - Sub-level caving (SLC) is an important mass mining method, used at LKAB The caved rock or debris at the SLC interface reduces the fragmentation and the swelling of the blasted ring and it dissipates the explosive energy These phenomena may immobilize the blasted ring, causing ore loss...
A method named 'Semi – level induced caving with single – sided lateral ore loading' is the biggest modification of currently known sublevel caving methods Principle of this method is caving of ore and a hanging wall In classification of mining methods, group of methods where ore is excavated in entire block height are named block methods...
Process animation - LKAB Sub-Level Caving (ENG) 6 years ago LKAB PRO In order to extract ore underground we have to build transport roads – tunnels in the rock called drifts Preparation of new areas of the mine for ore extraction is called development...
Jun 15, 2018· 7 Sublevel caving Sublevel caving is a method often evaluated in parallel with block and/or panel caving options It requires multiple levels of development and ongoing ring blasting for production Sublevel caving allows for a more selective extraction but typically achieves lower production rates than block and panel caving methods...
determining the optimal ratio for ore recovery coefficient is reviewed several variants (Ivanovski 1986; Mijalkovski 2015) Zone or interval to optimize the ore recovery coefficient in sublevel caving mining method is usually in ranges from 70 to 90%, while the ratio of the ore dilution ranges from 10 to 30%...
154 Sublevel caving 1541 Gravity flow of caved ore-Flow of caved ore cannot be described satisfactorily by theories for the flow of granular materials because the particle size, discharge rates, boundary conditions, feature of progressive breakdown of broken ores, and degree of fragmentation of ore...
Nov 12, 2019· Sublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1] The method functions on the principle that ore is fragmented by blasting, while the overlying host rock fractures and caves under the action of...
Feb 26, 2021· Sublevel Caving - oraee So, best conditions for sublevel caving are fairly compact ore, weak walls and steep dip Advantag The advantages of sublevel caving are claimed to be that: It can be applied to variety of rock condition - Quite flexible It is flexible as regards irregularity of the ore and low width, down to about 35 - 4m...
Jun 25, 2010· Sublevel caving is usually carried out when mining of the orebody through an open pit method is no longer economically feasible Mining now proceeds underground, underneath the ,...
Mar 01, 2019· As is well known, the disadvantages of sublevel caving are that ore recovery hardly exceeds 85-90% if waste rock dilution is to be kept below 20-30% Therefore, the main research and development work has been concentrated on parameters which can affect and reduce these disadvantag Caving theories and definitions...
A new mine planning tool for sublevel caving mines D Villa and T Diering 238 Caving 2010, Perth, Australia 2 Principles of PCSLC The PCSLC development tool is being done in conjunction with SRK Consulting enabling Gemcom to take advantage of the considerable SLC experience gained by SRK over the years This experience is proving...
FIELD: ore mining industry; applicable in mining of ore deposits with thickness above 5m and steeply dipping and with thickness of above 10-20m and slightly dipping SUBSTANCE: method includes driving on draw levels of drifts, crosscuts and air raises, making of drilling rooms on sublevels, and breakage of ore panels by holes with formation of recoverable pillar above workings of draw level ....
MacLean’s full suite of bULk MINING solutions With the increasing prevalence of bulk mining (block and sublevel caving) and the large ore volumes it generates, oversized hang-ups present correspondingly significant challenges to ore flow for mine operators MacLean’s comprehensive suite of ore flow solutions starts with Water Cannons as a ....
Process animation - LKAB Sub-Level Caving (ENG) 6 years ago LKAB PRO In order to extract ore underground we have to build transport roads – tunnels in the rock called drifts Preparation of new areas of the mine for ore extraction is called development...
Sublevel caving (SLC) is a mass mining method based upon the utilisation of gravity flow of blasted ore and caved waste rock [1] The method functions on the principle that ore is fragmented by blasting, while the overlying host rock fractures and caves under the action of mine-induced stresses and gravity [2]...
1 Diagrammatic plan of sublevel caving in Kiruna: l--drifting; 2--ring drilling (roof of slice); 3---charging of explosive; 4--ore loading so-called Tunnler 200 (Fig 2) with from 1 to 3 drills on a chain-feed cradle and in larger headings drill rigs with hydraulically operated feed cradles may be used...
Jun 15, 2018· 7 Sublevel caving Sublevel caving is a method often evaluated in parallel with block and/or panel caving options It requires multiple levels of development and ongoing ring blasting for production Sublevel caving allows for a more selective extraction but typically achieves lower production rates than block and panel caving methods...
A new mine planning tool for sublevel caving mines D Villa and T Diering 238 Caving 2010, Perth, Australia 2 Principles of PCSLC The PCSLC development tool is being done in conjunction with SRK Consulting enabling Gemcom to take advantage of the considerable SLC experience gained by SRK over the years This experience is proving...
DOI link for Predicting ore grades in cave rock for large scale sublevel caving Predicting ore grades in cave rock for large scale sublevel caving book By ME Kuchta Book Computer Applications in the Mineral Industri Click here to navigate to parent product Edition 1st Edition First Published 2001...
In sublevel caving, the ore blocks are usually mined in descending order When , experience, more than 20 % dilution is considered as excessive (Pakalinis et al, 1995)...