Sketches Of Overburden And Rorckmass Ratios In A Qaurry

  • Stripping ratio Wikipedia

    In surface mining stripping ratio or strip ratio refers to the amount of waste or overburden that must be removed to release a given ore quantity It is a number or ratio that express how much waste is mined per unit of ore The units of a stripping ratio can vary between mine types For example in coal mining the stripping ratio is commonly referred to as volume/weight

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  • STABILITY ANALYSIS OF OVERBURDEN INTERNAL DUMP

    overburden material that has to be extracted in order to obtain the coal The total volume of these overburden/waste rock in Amlohri opencast mine is about 1400Mm 3 with a stripping ratio of 3/t The OB overlying the Turra top and Turra bottom seams are being excavated using dragline and rest of OB in between the

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  • O RTICLES Estimation of Reserve Overburden Ratio of A

    a minimum ratio of overburden to basement thickness of 1 1 and a limiting 10m overburden is considered to be the economically exploitable area The VES results showed a two to three geoelectric

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  • Prediction of near field overpressure from

    01/12/2010· In the rest of the blasts one of the blasting ratios mainly H/B or T/B in quarry A and B/d in quarry B is outside the suggested range The existence of a loose overburden of sandy nature and little cohesion in quarry A is the reason for blasting in higher benches with longer stemming lengths than usual The use of fairly inclined blastholes in quarry B allows longer burdens than those given

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  • STABILITY ANALYSIS OF OVERBURDEN INTERNAL DUMP

    overburden material that has to be extracted in order to obtain the coal The total volume of these overburden/waste rock in Amlohri opencast mine is about 1400Mm 3 with a stripping ratio of 3/t The OB overlying the Turra top and Turra bottom seams are being excavated using dragline and rest of OB in between the

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  • Height of overburden fracture based on key strata

    24/01/2020· In this way the generation of cracks in the rock mass can be determined by the appearance of identifiable joint fractures in the overburden after excavation However as the block can deform infinitely it will not generate cracks even if stress exceeds the limit strength Moreover crack initiation and development in strata are different in appearance Due to their small size the initiated

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  • STABILITY EVALUATION OF AN UNDERGROUND QUARRY IN OYA

    entire support of the overburden load from the rooftop up to the surface Additionally there ought to be firm through the mining process and in some cases even for post mining activities [2] [1] [3] Furthermore discontinuities in general are zones of weakness Thus if it is found in a rock mass or an

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  • TES analysis for crushed stone aggregate quarry site

    15/02/2021· In the study area a minimum value of the rock mass to overburden thickness ratios of was obtained for facet # 98 and even this value very much satisfy the universal profitability factor of thickness ratio of for mineral deposits Bale et al 2011 Therefore in the study area although high volumes of overburden need to be removed sometimes at facets such as 1 18 52 53 and 80

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  • Overburden Wikipedia

    In mining overburden also called waste or spoil is the material that lies above an area that lends itself to economical exploitation such as the rock soil and ecosystem that lies above a coal seam or ore body Overburden is distinct from tailings the material that remains after economically valuable components have been extracted from the generally finely milled ore

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  • Geotechnical Engineering II KSU

    Area Ratio A R Sampling tube soil The thicker the wall of the sampling tube the greater the disturbance Good quality samples A R <10% CE 483 Foundation Engineering 2 Site Investigation Soil sampling Implementation Sampling Disturbed vs Undisturbed 12 Area Ratio A R = = •Samples collected in Split spoon Sampler is usually classified as disturbed What is the Area Ratio

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  • Prediction of near field overpressure from quarry blasting

    Quarry blasts Front offace ISEE [4] Confined blasts for airblast 1906 suppression Blasts with average burial ofthe charge Kuzu et al Quarry blasts in competent 2 [6] rocks Quarry blasts in weak rocks 2 Overburden removal 2 Hustrulid Detonations in air

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  • TES analysis for crushed stone aggregate quarry site

    15/02/2021· In the study area a minimum value of the rock mass to overburden thickness ratios of was obtained for facet # 98 and even this value very much satisfy the universal profitability factor of thickness ratio of for mineral deposits Bale et al 2011 Therefore in the study area although high volumes of overburden need to be removed sometimes at facets such as 1 18 52 53 and 80

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  • Prediction of near field overpressure from quarry blasting

    Quarry blasts Front offace ISEE [4] Confined blasts for airblast 1906 suppression Blasts with average burial ofthe charge Kuzu et al Quarry blasts in competent 2 [6] rocks Quarry blasts in weak rocks 2 Overburden removal 2 Hustrulid Detonations in air

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  • Overburden Wikipedia

    In mining overburden also called waste or spoil is the material that lies above an area that lends itself to economical exploitation such as the rock soil and ecosystem that lies above a coal seam or ore body Overburden is distinct from tailings the material that remains after economically valuable components have been extracted from the generally finely milled ore

    Get Price
  • Quarry optimisation good fragmentation less fines

    Figure 1 Geological areas at which different blast designs were applied Bench8 overburden blast design OBB benches 7 5 Blast A benches 4 1 blast desing B Different blast designs implemented Original blast design used throughout the entire quarry was Hole diameter 113 mm 4 1/3 Burden x Spacing m x 4 m 11 5´x 13 3´ Stemming 2 m ´ Bottom charge 11 kg

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  • PDF Estimation of Reserve Overburden Ratio of

    Estimation of Reserve Overburden Ratio of A Proposed Quarry Site Using Resistivity Survey A Case Study of Ajebo Near Abeokuta Southwestern Nigeria 1

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  • Underground Quarrying for Marble Stability Assessment

    consider the rock mass as a continuous body distinct elements DEM considers the rock mass as a discontinuous body with intact rock and natural discontinuities It is difficult to identify the model that better reproduces the behavior of the rock mass in a specific case For this reason in some cases the analyses are usually carried out

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  • Investigation of movement and damage of

    01/05/2019· Sketch map of key strata in overburden the ratio of horizontal stress to vertical stress was found to be in the range of 29 Therefore the horizontal to vertical stress ratio k of and were implemented in four numerical models Validation of numerical surface subsidence Fig 8 Fig 9 show the vertical and horizontal displacements of the ground

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  • INCREMENTAL OPEN PIT MINING OF STEEPLY DIPPING ORE

    laid in the temporary conservation of overburden rocks and leaving a tempo rary basset edge within the quarry This is due to the desire to reduce the volume of mining and stripping operations in the initial periods of quarries exploitation To reduce costs it is advisable to plan incremental surface mining with the estab lishment of pushbacks Phased formation dynamics of the working zone of

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  • Prediction of near field overpressure from

    01/12/2010· In the rest of the blasts one of the blasting ratios mainly H/B or T/B in quarry A and B/d in quarry B is outside the suggested range The existence of a loose overburden of sandy nature and little cohesion in quarry A is the reason for blasting in higher benches with longer stemming lengths than usual The use of fairly inclined blastholes in quarry B allows longer burdens than those given

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  • Blasting mechanics Blasting design standards Pit

    21/02/2019· Company 2 may be a quarry that will use a slightly larger burden ratio than Company 1 because they can have a larger fragmentation size that will be moved by a loader and haul trucks that can carry 40 tons in a load Company 3 may be a large metal or coal mine that has large shovels and haul trucks that can easily haul 300 tons at a time This company may have an even larger burden ratio

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  • In Situ Stresses Stress Measurement

    the rock mass it must be recognized that an in situ pre existing state of stress already exists in the rock 10 of 64 Erik Eberhardt UBC Geological Engineering EOSC 433 2017 In Situ Stress Tectonics When considering the loading conditions imposed on the rock mass it must be recognized that an in situ pre existing state of stress already exists in the rock Zoback et al 1989 6 11

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  • Prediction of near field overpressure from

    01/12/2010· In the rest of the blasts one of the blasting ratios mainly H/B or T/B in quarry A and B/d in quarry B is outside the suggested range The existence of a loose overburden of sandy nature and little cohesion in quarry A is the reason for blasting in higher benches with longer stemming lengths than usual The use of fairly inclined blastholes in quarry B allows longer burdens than those given

    Get Price
  • Overburden an overview ScienceDirect Topics

    Contour surface mining takes advantage of the low strip ratio coal reserves adjacent to the outcrop Contour mining equipment includes a drill loader bulldozers and trucks The steps in contour mining begin with drilling and blasting a triangle shaped portion of overburden in cross section above the coal to be mined The fractured overburden is then loaded into rubber tired trucks The

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  • Rock fragmentation control in opencast blasting

    01/04/2016· 1 Introduction Rock fragmentation distribution influences a range of mining and milling processes including load and haul rates crushing and grinding performance and ore recovery in beneficiation processes Michaud et al 1997 In opencast mining where blasting is employed for excavation the overall cost effectiveness of the production operations is compatible with optimization

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  • Investigation of movement and damage of

    01/05/2019· Sketch map of key strata in overburden the ratio of horizontal stress to vertical stress was found to be in the range of 29 Therefore the horizontal to vertical stress ratio k of and were implemented in four numerical models Validation of numerical surface subsidence Fig 8 Fig 9 show the vertical and horizontal displacements of the ground

    Get Price
  • Quarry optimisation good fragmentation less fines

    Figure 1 Geological areas at which different blast designs were applied Bench8 overburden blast design OBB benches 7 5 Blast A benches 4 1 blast desing B Different blast designs implemented Original blast design used throughout the entire quarry was Hole diameter 113 mm 4 1/3 Burden x Spacing m x 4 m 11 5´x 13 3´ Stemming 2 m ´ Bottom charge 11 kg

    Get Price
  • Investigation of movement and damage of

    01/05/2019· Sketch map of key strata in overburden the ratio of horizontal stress to vertical stress was found to be in the range of 29 Therefore the horizontal to vertical stress ratio k of and were implemented in four numerical models Validation of numerical surface subsidence Fig 8 Fig 9 show the vertical and horizontal displacements of the ground

    Get Price
  • Design and operational considerations of hard

    01/12/2017· Relative to sand and gravel operations hard rock quarries normally have very little waste in the form of overburden and typically have low overburden stripping ratios This can lead to

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  • sketches of overburden and rorckmass ratios in a

    Sketches Of Overburden And Rorckmass Ratios In A Qaurry Stripping overburden limestone mining stripping overburden limestone miningtripping overburden limestone miningkmbtbusinurface miningwikipedia the free encyclopedia surface mining including strip mining openpit mining and mountaintop removal mining is a broad category of mining in

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