mine bench height for blasting

    Improved Blasting and Bench Slope Design at the Aitik Mine

    Improved Blasting and Bench Slope Design at the Aitik Mine P-I. Marklund Boliden Mineral AB, Sweden J. Sjöberg Vattenfall Power Consultant AB, Sweden F. Ouchterlony Swebrec at Luleå University of Technology, Sweden N. Nilsson Nitro Consult AB, Sweden Abstract The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase,

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    Pit Wall Angles and Bench Width – How Do They .

    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.

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    DESIGN OF SURFACE BLASTS- A COMPUTATIONAL APPROACH

    National Institute of Technology Rourkela CERTIFICATE This is to certify that the thesis entitled "SURFACE BLAST DESIGN-A COMPUTATIONAL APPROACH" submitted by Sri Ashutosh Mishra, Roll No. 10505029 in partial fulfillment of the requirements for .

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    Rock fragmentation control in opencast blasting ...

    01-04-2016· The bench height is related to the working capability of loaders and varies from 5 m to 42 m. A few blasts were performed by the existing blast design practiced in the mine and after each blast, 18–25 scaled digital photographs throughout the complete mucking of the fragmented rock pile were taken as well as loading efficiency of the shovel was recorded.

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    big bench blasting in mining operations - Hitlers .

    big bench blasting in mining operations. 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

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    BLAST DESIGN IN SURFACE MINES | Explosive .

    Less back break Elimination of Toe problems Better displacement Increased fragmentation Stable face Blast hole inclination of 150- 250 is recommended for blasting in surface mines Bench height can be increased which reduces the number of haulage levels Disadvantages: Harder to collar holes Difficult to maintain accurate angle More problems with geologic discontinuities Easier to hang steel in ...

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    Economic evaluation of optimum bench height in quarries

    economical bench height has been suggested to be 12 m (Lechner, 1971). Today, bench height can be designed up to 15 m in large quarries, while it can be 12 m in small ones. Moreover, in small open pit gold mines it is feasible to design bench heights up to 7.5 m since it requires selective mining and the achievement of less dilution (Hustrulid and

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    explosives – Mining and Blasting

    Taller bench heights will allow larger hole diameters and larger burdens and less drilling and blasting cost. Also, if the material to be blasted is blocky, it is quite likely that some blocks may emerge intact unless smaller hole diameters and tighter patterns place explosives within them.

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    ASK MINING: Blasting Practices at Open Cast Mines

    For Coal Mines (Overburden bench), an example 1. height of bench = 13-14m 2. width of bench= 20-25m 3. Avg. Burden= 4m 4. Avg. Spacing= 5m 5. Diameter of blast hole= 250mm 6. No. of blast hole/ blast = 20-35 7. Blasting Pattern is staggered/ rectangular 8. Depth of Blast hole = 13-14m 9. length of face = 40 -100m 10. explosives: Site Mixed ...

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    CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE ANGLE .

    angles (65°, 75°, 85° and 90°) and 3 different bench heights of 16.7m, 20m, and 25m evaluated for each. These bench heights correspond to 4, 5 and 6 benches in a stack respectively. The selection of the bench height is, however, most often a function of the equipment size and its reach and the required selectivity of the ore. The

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    Blasting sequence at Goldcorp's Penasquito mine .

    28-08-2014· MineSight at Goldcorp's Penasquito mine, Zacatecas, Mexico A blasting sequence at Goldcorp's Penasquito silver-gold mine, where MineSight is integral to mine...

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    height of iron ore mine bench in south africa

    height of iron ore mine bench in south africa Mining Technology | Mining News and Views Updated Daily, Mining Technology | Mining News and Views Updated Daily is using cooki We use them to give you the best experience If you continue using our website, we'll assume that you are happy to receive all cookies on this website, Rock collapse at gold mine in South Africa kills four workers

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    Designing Blast Patterns Using Empirical Formulas

    This publication has been cataloged as follows: Pugliese, Joseph M Designing blast patterns using empirical formulas: a com­ parison of calculated patterns with plans used in quarrying

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    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 of

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    Bench Height | Drilling | Mining | Free 30-day Trial .

    Mine Planning Bench Blasting. TGA March. 1-s2.0-S0924013600006865 ... Geology may Constrain Need to mine certain intervals quarry rock quality control toxic or substitute topsoil rock in coal mine Grade Control height of bench averages out high and low grades and may limit selective mining Need to Manipulate Problem Layers hard layer on top ...

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    Rock fragmentation control in opencast blasting ...

    01-04-2016· The bench height is related to the working capability of loaders and varies from 5 m to 42 m. A few blasts were performed by the existing blast design practiced in the mine and after each blast, 18–25 scaled digital photographs throughout the complete mucking of the fragmented rock pile were taken as well as loading efficiency of the shovel was recorded.

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    ON-BENCH PRACTICES FOR OPEN CUT MINES AND QUARRIES

    Code of Practice: On-Bench Practices for Open Cut Mines and Quarries Page 1 . ... of any scheduled blasting on a mine/quarry site. Blast Area – The area where blastholes are to be charged and fired, and within which access will be restricted to authorised persons, ...

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    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

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    Blaster'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 ...

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    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 of

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    Economic evaluation of optimum bench height in quarries

    Moreover, in small open pit gold mines it is feasible to design bench heights up to 7.5 m since it requires selective mining and the achievement of less dilution (Hustrulid and Kuchta, 1998). When planning an economical bench height, it has been underlined that drilling speed and penetration rate influence drilling cost. Therefore, blasting operation, which

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    ASK MINING: Blasting Practices at Open Cast Mines

    For Coal Mines (Overburden bench), an example 1. height of bench = 13-14m 2. width of bench= 20-25m 3. Avg. Burden= 4m 4. Avg. Spacing= 5m 5. Diameter of blast hole= 250mm 6. No. of blast hole/ blast = 20-35 7. Blasting Pattern is staggered/ rectangular 8. Depth of Blast hole = 13-14m 9. length of face = 40 -100m 10. explosives: Site Mixed ...

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    Optimization of Blasting Parameters in opencast Mines

    National Institute of Technology Rourkela This is to certify that the thesis entitled " Optimization of Blasting Parameters in Opencast Mines " submitted by Sri Manmit Rout (Roll. No.: 10305019) and Sri Chinmay Kumar Parida (Roll. No.: 10305017), in fulfillment of the .

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    Blasting sequence at Goldcorp's Penasquito mine .

    28-08-2014· MineSight at Goldcorp's Penasquito mine, Zacatecas, Mexico A blasting sequence at Goldcorp's Penasquito silver-gold mine, where MineSight is integral to mine...

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