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·Sublevel stope mining is one of the common underground mining methods which is suitable for steeply deeping and tabular orebodies In this method large open stopes are created in the vertical direction as shown in the Fig 1 to extract the materials existing in a competent ore and host rock [] The extracted ore from drilling and blasting of sublevels within
Sublevel Open Stoping If we had a stronger and more competent host rock we could dispense with the need to keep ore in the stope to support the hanging wall as we do VCR mining Indeed such deposits do exist and when they do we can employ the open stoping method There are different variations but essentially we delineate
·In operations that use the sublevel stoping mining method production scheduling takes into account factors including ore reserve envelopes ore grade averages equipment capacity feed controls to the mill and geotechnical restrictions across the scheduling horizon Mathematical programming is one of the most effective methods for enhancing the
·Long hole winze LHW blasting is a critical stage of production in underground sublevel open stoping; however its influence on potential excavation damage is often overlooked In addition
The pillar stability factor PSF is calculated in three different mining stages for a sublevel open stoping mining project located in northern Botswana Several three dimensional finite element models were developed by varying the stope span Pillar strength was estimated using the Lunder and Pakalnis equation and pillar stress was obtained from the numerical models
·The sublevel open stoping using subframe long hole with back filling mining method was applied in practical production conditions and a 3D laser scanning system CMS was used in the stoped area after extraction in order to evaluate the mining process The industrial experimental results showed that ore production capacity can reach up to 600 t
·Villaescusa [3] conducted an extensive review of those used specifically in sublevel open stoping Others [1 2 15 16 17 18] provided in depth reviews of typical sequences used at Canadian mines
·Sublevel open stoping design of the O640 L651 and N659 sublevel open stopes in the 3000 orebody of the Mount Isa copper mines Queensland Australia Department of Mining University of Pretoria
·Compared with sublevel open stoping with subsequent backfill sublevel roadway is omitted preparation and cut engineering quantities are less blast hole diameter and depth are large and production capacity is large Further Reading Gan D Q Sun G H Li Z J 2012 Mining design technology of underground mines Metallurgical Industry Press
·The present study enhances prior integrated optimisation approaches to a variation of the sublevel longhole open stoping mining method using backfilling through a new two stage stochastic integer programming formulation A comparison to a sequential stochastic approach shows different stope layouts and extraction sequences for a copper mine
Villaescusa [3] conducted an extensive review of those used specifically in sublevel open stoping Others [1 2 15 16 17 18] provided in depth reviews of typical sequences used at Canadian mines
The concept of sublevel open stoping also known as long hole or blast hole stoping was originally developed in the first half of the 20th century in Michigan It originated from a mining method referred to as short hole bench mining which was used at that time for the extraction of iron ore Haldar 2018 During this time period the
·In the sublevel variation of open stoping the stope faces retreat from the end of the ore body or stope limit longitudinally or where the stopes are run across the lode from one of its walls The miners are always working under solid backs and have a safe avenue of retreat through the subdrifts to the manway raises Slabbing of roof or walls
Download scientific diagram Sublevel open stoping method Atlas Copco 2007 from publication Possibility of application of backfill methods with cementing fill in ore body Borska reka The
Sublevel open stoping SLOS is a self supporting mining method which is widely used in the world Sublevel open stoping method popularity has grown since 1970 and at the end of the 20th century Henning 2007 Jang 2014 cited Austrade 2013 reported that 70% of underground mines in Australia use sublevel open stoping mining method
Dilution is associated with considerable direct and indirect costs in underground open stoping operations As shown in previous works an improved ability to predict dilution enables the economic risks associated with unplanned dilution to be reduced Depending on the width of the orebody and depth of mining the economic performance of an open stoping operation can
·The ore body can be efficiently mined in large volumes and with higher productivity using larger underground equipment and the bulk mining methods There are several methods for bulk underground mining the most common being block caving long hole open stoping sublevel open stoping sublevel caving and vertical crater retreat Block Caving
·Sublevel Open Stoping mineral con las siguientes características exceder el ángulo de reposo FIGURA 49 Drawpoint Underground Mining Methods Sublevel Stoping 57 Un diseño simple de drawpoints esta ganando en popularidad El carguío de mineral es echo directamente en el fondo del tajeo dentro del open stope
Sublevel Open Stoping Ernesto Villaescusa Western Australian School of Mines Created Date 2/4/2014 9 39 31 AM
·In the current sublevel open stoping operation the production levels are assumed to be separated by sill pillars of 10 m high equal to the height of one block and the stopes are separated by rib and longitudinal pillars of different sizes which are presented in Table 2 showing the user defined parameters of each geotechnical zone
·The top down extraction sequence in the sublevel open stope method leaves rib pillars to support the excavations so the stability of the pillars and stopes makes dilution control critical in this method This work introduces an integrated methodology for the net profit and geomechanical optimization of the layout of open stopes and rib pillars with the use of a
1 ·The first comprehensive work on one of the most important underground mining methods worldwide Geotechnical Design for Sublevel Open Stoping presents topics according to the conventional sublevel stoping process used by most mining houses in which a sublevel stoping geometry is chosen for a particular mining method equipment availability and work force
