• Selection of practical bench height in open pit mining

    Dilution versus bench height (Bozorgebrahimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as deposit-related or mine-related. The bench height is a mine-related parameter that can be studied using a simple geometrical model ofmine bench height for blasting,,blast pattern Mining and Blasting. 12/10/2012 Bench height = 1.5 to 4 times the burden, or possibly higher; Bench height is usually limited on the low end by the height of the stemming column required and its limiting effect on the amount of explosive that can be loaded, and limited on the high end by the height of the digging equipment

  • Selection of practical bench height in open pit mining

    Determination of practical bench height is an important subject in open pit mining. This subject has always been an issue with different and sometimes conflicting criteria that have to bemine bench height for blasting frontemare.eu,mine bench height for blasting leathernecktactical . Dec 20, 2015 . analyzed, which include bench height and mining panel width, inclined angle of blast holes, explosive unit consumption (EUC), delay time. Live Chat Controlled blasting in an open pit mine for improved . Get price.

  • (PDF) Optimisation of Drill and Blast Parameters Using

    Blasting in-situ rock to its desired fragment size requires both controllable (bench height, hole diameter, spacing, burden, hole length, bottom charge, specific charge) and uncontrollable (rockDevelopment and Application of Blast Casting Technique in,Abstract. Blast casting is a high-efficiency technique applied in surface mines for overburden removal and results in stripping cost savings. According to ballistic theory and center-of-mass frame basic movement principles, key factors influencing blast casting effect were analyzed, which include bench height and mining panel width, inclined angle of blast holes, explosive unit consumption

  • mine bench height for blasting,

    blast pattern Mining and Blasting. 12/10/2012 Bench height = 1.5 to 4 times the burden, or possibly higher; Bench height is usually limited on the low end by the height of the stemming column required and its limiting effect on the amount of explosive that can be loaded, and limited on the high end by the height of the digging equipmentmine bench height for blasting frontemare.eu,mine bench height for blasting leathernecktactical . Dec 20, 2015 . analyzed, which include bench height and mining panel width, inclined angle of blast holes, explosive unit consumption (EUC), delay time. Live Chat Controlled blasting in an open pit mine for improved . Get price.

  • mine bench height for blasting

    Mine Bench Height For Blasting pclconsult. Bench Blasting . Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, and at spacing so that the ANFO (which is a mixture of Ammonium Nitrate[fertilizer] and Fuel Oil [diesel fuel]) as a Development and Application of Blast Casting Technique in,Abstract. Blast casting is a high-efficiency technique applied in surface mines for overburden removal and results in stripping cost savings. According to ballistic theory and center-of-mass frame basic movement principles, key factors influencing blast casting effect were analyzed, which include bench height and mining panel width, inclined angle of blast holes, explosive unit consumption

  • Economic evaluation of optimum bench height in quarries

    bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportationBlaster's Training Modules Module 4 Blasthole Drilling,Bench Height feet 3 3.5 4 4.5 5 5.5 6 6.25 6.5 6.75 7 7.88 9 9.88 10.6 12.3 13 15 16 3 7 10 13 16 20 23 26 30 33 36 39 43 46 49 52 56 59 62 66 69 72 75 79 82 Hole Diameter in Inches A common method for calculating this relationship is: d (inches) < H/5 (in feet). Thus, for example, the maximum recommended drill-hole diameter for a mine that

  • Pit Wall Angles and Bench Width How Do They Relate?

    May 10, 2015· A rule of thumb is that the catch bench width should be according to the formula 4.5m + 0.2H, where H is the height of the bench. This means the recommended catch bench width for a 5m high bench should be about 5.5m; for a 10m high bench it should be 6.5m; and for 15m high bench it should be 7.5 metres.CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE ,The South African Institute of Mining and Metallurgy height, bench face angle and berm width can be used in the slope design. The bench designs of blasting for wall stability are an additional criterion. The wedge failure mechanism and volume of failed material are illustrated in

  • Improving Double Bench Face Performance at the Ekati

    involves drilling, blasting, and excavating the material for the design bench height. A second bench is then excavated without the creation of a catch bench, i.e. only minimal offset from the first bench face is allowed when drilling off the second bench. The result is a double high bench face or double bench.Optimized design of drilling and blasting operations in,Nov 01, 2018· Some other researchers made attempts to optimize drilling and blasting operations from the technical point of view; Sontamino and Drebenstedt addressed a dynamic model for a bench blasting design . Bowa introduced a practical method in an open pit mine to optimize blasting design parameters such as bench height, drill hole diameter, spacing

  • An Open Pit Bench Blasting Application Mining Consultant

    Dec 09, 2016· Bench Blasting Application. Hi everyone, I want to show an application from beginning to end in open pit bench blasting.Step-by-step we’re going to explain what we should do in an open pit bench blasting.In most of mine works which including open pit production methods use almost same stage in blasting.Bench Height Drilling Mining Free 30-day Trial Scribd,Mine Planning Bench Blasting. TGA March. 1-s2.0-S0924013600006865-main.pdf. ICRAMID_283. Tech Drilling DrDrilling1. and benches fragmentation usually cheaper with larger holes and benches Regulations may constrain Some localities limit bench height for safety Blast

  • Bench Blasting

    Bench Blasting . Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, and at spacing so that the ANFO (which is a mixture of Ammonium Nitrate[fertilizer] and Fuel Oil [diesel fuel]) as a column charge,together with a bottom charge, can fracture the rock in a controlled manner.H BLASTING IN SURFACE EXCAVATION Mining and Blasting,c. blast geometry; d. blast size; e. the priming method; and f. the initiation sequence Terminology in bench blasting Free face: This is an exposed rock surface towards which the explosive charge can break out. It resembles a wall. Face height (H): This is the vertical distance in metres between the top and floor of the bench and should be at least

  • H BLASTING IN SURFACE EXCAVATION Mining and Blasting

    c. blast geometry; d. blast size; e. the priming method; and f. the initiation sequence Terminology in bench blasting Free face: This is an exposed rock surface towards which the explosive charge can break out. It resembles a wall. Face height (H): This is the vertical distance in metres between the top and floor of the bench and should be at leastBench Height Drilling Mining Free 30-day Trial Scribd,Mine Planning Bench Blasting. TGA March. 1-s2.0-S0924013600006865-main.pdf. ICRAMID_283. Tech Drilling DrDrilling1. and benches fragmentation usually cheaper with larger holes and benches Regulations may constrain Some localities limit bench height for safety Blast

  • Economic evaluation of optimum bench height in quarries

    bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportationImproving Double Bench Face Performance at the Ekati,involves drilling, blasting, and excavating the material for the design bench height. A second bench is then excavated without the creation of a catch bench, i.e. only minimal offset from the first bench face is allowed when drilling off the second bench. The result is a double high bench face or double bench.

  • CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE

    The South African Institute of Mining and Metallurgy height, bench face angle and berm width can be used in the slope design. The bench designs of blasting for wall stability are an additional criterion. The wedge failure mechanism and volume of failed material are illustrated inBlast design in opencast mining,Oct 12, 2017· Blasting parameters Burden- the shortest distance between two holes perpendicular to the face. It should be adequate. In practice, burden = ½ to 1/3 of bench height. Spacing- distance between two consecutive holes in a row parallel to face. It should be adequate. In practice, spacing = 1.0 to 1.5 of burden. 9.

  • ASK MINING: Blasting Practices at Open Cast Mines

    Mar 02, 2012· Blast Hole Diameter: Up to bench height of 8m, 100mm,, 150mm, 163mm of blast hole diameter is preferred but for bench height > 8m, a minimum of 250mm diameter of blast hole is efficient. 4. Spacing and Burden: In coal measure rocks spacing varies from 3-8m whereas burden is selected about 0.8 times the spacing.Rock fragmentation control in opencast blasting,Apr 01, 2016· But, all the blast design parameters cannot be changed depending on the type of strata and bench height. Hole diameters of 159 mm, 259 mm, 269 mm and 311 mm were used depending on their bench height. The bench height is related to the working capability of

  • Surface mining planning and design of open pit mining

    Jan 09, 2016· 2 February 2016 Prof. Dr. H.Z. Harraz Presentation Mining Methods, Surface mining 23. 1.5) Bench height The bench height is the vertical distance between each horizontal level of the pit. The elements of a bench are illustrated in Fig. 1. Unless geological conditions dictate otherwise, all benches should have the same height.Blasting sequence at Goldcorp's Penasquito mine in,Aug 28, 2014· drill and blast mining Duration: 9:44. JasonGaugg 114,531 views. Blasting an access bench to save a dozer Duration: 4:50. Society For Mining, Metallurgy &

  • Bench Blasting

    Bench Blasting . Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, and at spacing so that the ANFO (which is a mixture of Ammonium Nitrate[fertilizer] and Fuel Oil [diesel fuel]) as a column charge,together Improved Blasting and Bench Slope Design at the Aitik Mine,For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be suitable in terms of both achievable bench slope geometry, and production concerns. For the hangingwall, a presplit blast design is used in specific areas to ensure that sufficient ramp width is achieved. The study

  • Mining Bench Height Evaluation for the Wallaby Resource

    A study on the feasibility of mining the recently discovered Wallaby gold deposit is due for completion by mid-2000. Open pit mining is the favoured method. Determination of the impact of mining bench height on the recovery of ore, including the estimation of dilution and Analysis of Safety Aspects And Mining Practices For,determining safe and workable bench height, bench face angle, and bench width. To determine the relationship of mine design parameters/practices and effective ground control in surface mining, this study was undertaken. It included coal and nonmetal mines, and consisted of four parts: • A review of accident statistics for the 1988-1997 period