mine bench height for blasting

mine bench height for blasting

Selection of practical bench height in open pit mining As a definition in open pit mining, bench height is the vertical distance between crest and toe of the b

  • Selection of practical bench height in open pit mining

    As a definition in open pit mining, bench height is the vertical distance between crest and toe of the bench (Fourie and Dohm, 1992) Determination of optimum bench height is a major concern in most open pit mines It depends on various factors, such as the cutting height and the bucket capacity of the loading machinesBench height = 15 to 4 times the burden, or possibly higher Bench height is usually limited on the low end by the height of the stemming column requimine bench height for blasting maciejchorowskiplA table of this information may also be available in the form of drill sheets, so that actual drilled records can be compared to design ; (e) Charge sheets detailing the location of primers, charge mass and length, length of inert decks (gravel, air or water), and stem heights for each blastholeONBENCH PRACTICES FOR OPEN CUT MINES AND QUARRIES

  • (PDF) Selection of practical bench height in open pit

    The height of bench calculation depends on some criteria such as cost, safety, equipment availability, ore dilution and annual schedule of production [3]Drilling,Blasting&Breaking Sarathy 14 also reported that a bench heighttoburden ratio of 25 to 3 provides the ideal situation for fragmentation as smaller values than this result in a ‘cratering’ effect, which generates flyrock, airblast, vibrations and oversizes Conclusion Based on this case study, it can be fragmentation Northern Coalfields LtdOptimizing Fragmentation AggNet08/06/2010· Bench Height Optimization Are bench dimensions always important ? Bench Height and Dilution Watch Your Blasting ! Slope Design : Summary Slope Design: Conclusions 1 Maximize the height of the benches * at the expense of mining selectivity? 2 Minimize the width of working benches * at the expense of productivity? 3 Minimize the number & width of catch benches * at the expense ofmining engineering: MINE DESIGN : BENCHING

  • Economic evaluation of optimum bench height in quarries

    growing bench height Blasting For the explosive material, 5 per cent Al added ANFO with a density of 09 kg/dm3 has been proposed, assuming that all the blast holes are dry The amount of primer has been considered to be 2 per cent of ANFO being used (Kose et al, 2000) Electrical capsules with a delay time of 25 msec have been employed as initiators In calculations, lengths of detonating04/05/2021· Subdrill is the additional hole length included to the Bench height to improve Blasting result and Bench safety Most drillhole blasted in the mine especially the small scale miners and artisanal don't include subdrill because they tend not to know it important As I have define earlier, there is a specified bench height design to mine an orebody, but the extended hole length beyond the benchGIANT MINER: SUBDRILL AN IMPORTANT PARAMETER IN BLASTINGDetermination 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 be(PDF) Selection of practical bench height in open pit

  • 222 Bench Parameters and their selection A surface mine

    222 Bench Parameters and their selection A surface mine bench is characterized by the following bench parameters – Bench height, Bench width, Bench length, Bench face slope and Bench floor slope Bench height is the vertical distance between the crest and toe of a bench As specified by the Directorate General of Mines Safety (DGMS), it shall not be more than the (i) maximum digging09/01/2016· Economics and Advantages of Bench Height Maintaining bench area involves a cost: • Less bench area = less cost • Higher benches are cheaper (usually) In drilling for blasting it takes time to set up for every hole drilled: • Higher benches allow larger more accurate holes • Allow greater spacing – uses drill time more effectivelySurface mining planning and design of open pit mining10/05/2015· The interramp angle can be created in many ways, depending on the bench height (“BH”), bench face angle, and the catch bench or berm width Different combinations of these can be used to develop the same interramp angle Typically the bench face angle (“BFA”) will be dictated by the rock strength, the structural fabric, and whether controlled blasting is used (minimizing damage toPit Wall Angles and Bench Width – How Do They Relate?

  • Open pit mining SlideShare

    31/07/2017· A bench will be longer for higher production rate Usually, blasting at one bench is done not more than once a week The extent of the orebody also has a deciding role here A simple diagram showing different design parameters is shown here: 10 10 A typical set of bench height, bench with and bench slope are given below: 11has yet to create a blast design method specifically tailored for large surface coal mine bench blasting This research examines the typical scale of bench blasting at large surface coal mines, develops a new method of design tailored for these operations, and tests the new method against two widely accepted traditional blast design methods Novel contributions of the research include a newA novel powder factor based bench blast design method forFigure 727: Key elements of an open pit mine Bench height (H): Vertical distance between upper and lower bench surface Toe: Interior vertex formed by the intersection of the bench face and bench floor Crest: Exterior vertex formed by the intersection of the bench floor and bench face Bench width: The distance between the crest and the723: Pit Terminology | ABC 123: Testing Site / Course

  • GIANT MINER: SUBDRILL AN IMPORTANT PARAMETER IN BLASTING

    04/05/2021· Subdrill is the additional hole length included to the Bench height to improve Blasting result and Bench safety Most drillhole blasted in the mine especially the small scale miners and artisanal don't include subdrill because they tend not to know it important As I have define earlier, there is a specified bench height design to mine an orebody, but the extended hole length beyond the benchThe ratio of bench height (H) to effective firing burden (Be) represents the stiffness ratio in a surface mine bench blast Changing the bench height, effective burden and/or the mode of firing may change this ratio in fieldscale blasts This is because, for a given burden, there exists a maximum bench height to produce a full crater The breakage angle for a given burden increases with theOptimizing Fragmentation | AggNetgrowing bench height Blasting For the explosive material, 5 per cent Al added ANFO with a density of 09 kg/dm3 has been proposed, assuming that all the blast holes are dry The amount of primer has been considered to be 2 per cent of ANFO being used (Kose et al, 2000) Electrical capsules with a delay time of 25 msec have been employed as initiators In calculations, lengths of detonatingEconomic evaluation of optimum bench height in quarries

  • Prediction of Rock Size Distribution in Mine Bench

    21/12/2019· Using an image processing technique, the SplitDesktop software package was used to analyze the RSD of 136 blasting events at a quarry in Vietnam Results were used as inputs, such as powder factor, explosive charge per delay, bench height, stemming length, and burden, and outputs, ie, RSD, in this study The novel scoring and colorintensity222 Bench Parameters and their selection A surface mine bench is characterized by the following bench parameters – Bench height, Bench width, Bench length, Bench face slope and Bench floor slope Bench height is the vertical distance between the crest and toe of a bench As specified by the Directorate General of Mines Safety (DGMS), it shall not be more than the (i) maximum digging222 Bench Parameters and their selection A surface minehas yet to create a blast design method specifically tailored for large surface coal mine bench blasting This research examines the typical scale of bench blasting at large surface coal mines, develops a new method of design tailored for these operations, and tests the new method against two widely accepted traditional blast design methods Novel contributions of the research include a newA novel powder factor based bench blast design method for

  • Surface mining planning and design of open pit mining

    09/01/2016· Economics and Advantages of Bench Height Maintaining bench area involves a cost: • Less bench area = less cost • Higher benches are cheaper (usually) In drilling for blasting it takes time to set up for every hole drilled: • Higher benches allow larger more accurate holes • Allow greater spacing – uses drill time more effectivelyFigure 727: Key elements of an open pit mine Bench height (H): Vertical distance between upper and lower bench surface Toe: Interior vertex formed by the intersection of the bench face and bench floor Crest: Exterior vertex formed by the intersection of the bench floor and bench face Bench width: The distance between the crest and the723: Pit Terminology | ABC 123: Testing Site / Courseand life of mine; Bench height, width and slope, Pit slope; Cutoff grade; Stripping ratio, Determination of mine parameters 3 4 Opening of Deposits: Box cut, site selection and driving, Formation of benches Trenches, Driving of entry and opening trenches; lying of communication routes, Different methods of opening up the deposits 3 5 Overburden Removal: Systems of overburden removal andMining Engineering

  • bench grinder safety rules

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