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Shrinkage stoping is a short hole mining method which is suitable for steeply dipping orebodies This method is similar to cut and fill mining with the exception that after being blasted broken ore is left in the stope where it is used to support the surrounding rock and as a platform from which to work Only enough ore is removed from the
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stope [noun] a usually steplike excavation underground for the removal of ore that is formed as the ore is mined in successive layers
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Essentially to keep the hanging wall and footwall from closing open stope and causing a failure Typically the ore is strong but the country rock less so This method works well with narrow veins as thin as 3 or thicker veins of 100 or so Stope lengths vary from 150 to 300 and heights of 200 to 300
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This is the focus of this study in order to establish design criteria to enable one to employ existing methods for stope design such as the Stability Graph by augmenting input parameters that have been calibrated through field measurements analytical assessments numerical modeling and laboratory testing to evaluate the effect of mining
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Spanish translation método de escalonamiento / escalonamiento con perforación long hole The current stoping method is mostly cut and fill mining and is suitable for the large workforce available to the mine however the economics of long hole stoping should be examined to see if it is more cost effective than the current method being used
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Bogging the Stope Bogging a Stope Inspecting the Drive Always get out of the bogger and inspect the same things you would in a heading Inspecting the stope From behind the bund in supported ground shine your light into the stope You are looking for any cracks on the hanging wall or the foot wall and around the brow area Inspect the dirt
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the sublevel cave mining process should promote rnaximizing both these parameters Results from the underground operatioos conciuded that fragmentation is of key importance to sublevel cave stope Proper fiagmentation of the ore column resulted in improved eEciency for the other mine operations aml was critical to recovery Underground observations
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The invention discloses a combined hole sublevel open stope subsequent filling mining method which is especially suitable for ore body stoping with medium ore rock stability medium average thicknessor above large attitude change and sharply thinned upper thickness A stope is arranged along an ore body movement direction the width of the stope is ore body thickness the height of the stope
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Shrinkage stope is a generic term used in mining to portray the process of mining upwards from a lower to an elevated horizon leaving broken rock in the excavation created The broken rock acts as a working platform and assists to stabilize the excavation by supporting the walls The method may be used for ore mining in shrinkage stopes for
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Primary Mining Method Long hole bench stoping with backfill Information Length 12 m to 15 m 39 ft to 49 ft if backfilled Height 10 m to 15 m 33 ft to 49 ft Ore width m to m 4 in to 5 ft Backfill type Waste rock Traditionally Kundana has used the long hole open stope benching More recently they have turned to a long
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C From the full load current table below select a transformer under the corresponding secondary voltage with a standard kVA capacity and amperage … is a type of instrument transformer that is designed to produce an alternating current in its secondary winding which is proportional to the current being measured in its primary
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Good operating practice is key to reducing drill hole deviation Every mining operation has had to deal with damaged drill rods or stalled operations due to hole deviation While your choice of equipment can help good operating practice is the most effective way to mitigate the problem It is helpful to understand the reason deviation occurs
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The gently inclined medium thick orebody is generally viewed as difficult to extract This paper presents a sublevel open stoping using long hole with back filling method particularly for inclined medium thick orebodies This method not only changes the temporal sequence of ore stoping and realizes transportation using gravity and trackless devices but also improves production capacity and
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v stopped stop·ping stops v tr 1 To close an opening or hole by covering stopped the check 10 Music a To press down a string on a stringed instrument on the fingerboard to produce a desired pitch b To close a hole on a wind instrument with the finger in sounding a desired pitch v intr 1 To cease moving progressing
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Nov 01 2021Hydraulic in situ measurement of rock mass permeability by packer Lugeon testing is an inherent and integral element of many engineering hydrogeological and mining investigation This paper describes and discusses geotechnical testing in the design process from a consulting practitioner s perspective
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It can help client to achieve the best economic and social benefit Below is 7 rules of thumb for open bit blast pattern 1 Burden 25 to 35 hole diameters 2 Spacing size greater than 140 mm 5½ to burden Hole size smaller than 140 mm 5½ to burden
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the in stope long hole drilling method are the ability to throw blast and the ride of the hangingwall and footwall for the following reasons • The steeper the dip the more efficient is blast and gravity assisted ore movement into secondary cleaning points gullies Figure 1 Typical in stope long hole drilling layout for a trackless mining
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About Us Downhole Surveys is an innovative Western Australian rental business with a global reach providing precision downhole instruments to the civil engineering mining exploration and drilling industries With over 30 years experience Downhole Surveys are the absolute authority when it comes to directional surveying technology and
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The miners drill blast holes in the stopes with hand held rock drills The stope is cleaned with slusher scrapers The inclined stope is a difficult place to work The miners have to climb the steep piles of blasted rock carrying with them their rock drills and the drag slusher pulley and steel wires
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Before time and money are spent on drilling and extraction planning and production engineers need to consider the following key aspects of stope design 1 STOPE GEOMETRY Mining Dimensions Consider the orebody and drive dimensions to ascertain what can be practically and economically extracted
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Download Free Template This Mine Safety Audit checklist template can be used to audit a mining site s vehicles and equipment road conditions emergency response plan mechanical electrical on site offices and much more to ensure mine safety Mining officers and site managers can also directly create corrective actions and further
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High Quality Rock Drilling Tools R25/R32/T38 Thread Button Bits Hard Rock Formation Forging Ore Mining High Performance Carbide Features of Bayiclan Square Hole Drill Bit woodworking Hole Saw Mortising Chisel Drill Bit Tool Set 1/4″ 5/16″ 3/8″ 2/5″ 1/2″ 5pcs Instructions Loosen the chuck by hand insert the drill bit s shank and
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Systems such as the Cavity Monitoring System revolutioni s ed stope reconciliation with the ability to define stope voids however these systems come with issues relating to shadowing point density and most importantly personnel exposure at the stope brow Hovermap is the next revolution for stope reconciliation Hovermap significantly increases data density removing shadows almost entirely
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Unplanned ore dilution has a direct and large influence on the cost of a stope and ultimately on the profitability of a mining operation This paper presents the results of an examination of factors influencing ore dilution in a blasthole stoping environment For the study a comprehensive database was established incorporating information related to the design construction excavation and
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Open stope mining data are used to assess quantitatively the stope dilution level The parameters considered in the study included the stope depth the stope average dip the hydraulic radius surface character RMR powder factor and the ELOS equivalent linear overbreak/slough parameter A dilution index DI is defined using the Rock System
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Stope Pillar is applied to flat ore body or dipping less than the angle of repose f General Feature II Maximum permissible dip is 40 degree for stope pillar method of mining Very thick ore body can be mined by Stope Pillar method By cutting horizontal slice either from top to bottom or bottom to top upper hand or under hand
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Primary Mining Method Long hole open stope Information The holes are loaded with Anfo ammonium nitrate Only the holes with a length over 15 m 49 ft are ignited in double Generally 3 to 4 rows are blasted at once approximately 1500 t per blast The powder factor is to kg/t Sons of Gwalia Ltd Yilgarn Star Mine Australia
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The figure below shows various methods of working the back in overhand stoping To start the stope if the ore is low grade and timber is scarce a pillar or pillars are left above the level as shown in A and if the ore is high grade it is all removed above the level and stulls are placed as shown at B To start a stope as shown at B a cutting out or lead stope is broken immediately above
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Open stoping This type of mining is used to recover steeply dipping orebodies in competent rock The ore is removed from the stope as soon as it is mined Sublevel stoping and big hole stoping are the important variants in use today A few examples of commodities mined by this method include iron and lead/zinc Room and Pillar Method
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