drilling pattern for blasting in Sweden

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  • Design of Drilling and Blasting Pattern for Excavation of ...

    2010-1-1 · Design of Drilling and Blasting Pattern for Excavation of HRT in High Temperature Zone (Adit 4 Upstream) at Karcham-Wangtoo Hydroelectric Project D. G. Kadkade Jaiprakash Associates Ltd Sector 128, Noida-201304, India Email: [email protected] ABSTARCT High temperatures (60°-98°C) were measured in tunnel of Karcham-Wangtoo

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  • A Pattern For Improvement | Agg-Net

    2021-6-9 · All the blasts were drilled using a staggered drilling pattern with ANFO explosive and sensitized emulsion cartridge primers. The blasts were initiated by shocktube with delay sequencing. Table 1 gives comprehensive details of four experimental blasts: B1, B2, B3 and B4.

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  • Drilling and Blasting in Underground Mining - GRT Review

    2021-4-1 · The drilling pattern chosen should suit the intended blasting operations to achieve minimal overburden at the primary blasting level. The need for secondary blasting to remove overburden should be minimal if the drilling patterns are set up properly.

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  • Drilling patterns - QueensMineDesignWiki

    The results of this study show that the drilling pattern with a spacing of 5 m, burden 4 m, hole depth 10 m, and hole diameter 15 cm is the most suitable one. The stemming length and powder factor of the sug-gested pattern are 2.3 m and 2.6 gr/cm3, respectively. Keywords: Drilling and blasting pattern; Sangan Iron Ore Mine; AHP; TOPSIS; PROMETHEE 1.

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  • Adalsbanan in Sweden - tunnel

    3. Smooth blasting or normal blasting of the contour. 4. Hole diameter . 5. Collaring deviation . 6. Angular deviation . 7. Planned advance or hole depth . 8. Types of blasting agents and degree of packing . 9. Weight strength of the explosives . 10. The toughness of the rock described by a rock constant . 11. Cost of the drilling equipment and ...

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  • SELECTION OF THE MOST PROPER DRILLING AND BLASTING

    2019-7-19 · blast hole pattern. Hence, the function (2) considering specific charge is: 2 3 0 0 = ⋅ o i i i W W q q η η (3) where W 0 is reference value of a blast hole pattern, m; q 0 is reference specific energy cost, kgm/m3; Q i is new blast hole pattern value, m; q i is new specific energy cost, kgm/m3. The analysis of bulk blasts using (3) showed that

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  • Computer Calculations Of Drilling Patterns For Surface And ...

    2019-1-1 · Smooth wall blasting is the most commonly used underground technique and was developed in Sweden . The smooth wall line technique is composed around the final excavation line underground where the holes are lightly loaded to reduce the amount of overbreak. These explosives are also decoupled from the sides of the borehole . The final feature of smooth wall blasting …

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  • Designing Blast Patterns Using Empirical Formulas

    2014-4-2 · Empirical formulas that may be applied to drilling and blasting pattern design..... 6 Calculation of burden, B, from equation 1 ... Blasting pattern dimensions for Wisconsin, Milwaukee County, Quarry No. 8..... 23 10. Blasting pattern dimensions for Wisconsin, Racine County, ...

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  • SELECTION OF THE MOST PROPER DRILLING AND BLASTING

    99 Selection of the most proper drilling and blasting pattern by using MADM methods … Rudarsko-geološko-naftni zbornik i autori (The Mining-Geology-Petroleum Engineering Bulletin and the authors) ©, 2020, pp. 97-108, DOI: 10.17794/rgn.2020.3.10

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  • Drill and Blast Method - rail system

    2009-9-17 · For the first round with EMULAN a drilling pattern of 2 2.5 x 6 m was used. Stemming was about 2 m. The blasting result was very good but the fragmentation was too fine to be acceptable. The high density of EMULAN together with this narrow drillpattern resulted in a very high powder factor. 2 The drilling pattern was later expanded to 3.2 x 6.4 m

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  • BULK EMULSION EXPLOSIVE - A CASE STUDY

    2017-5-9 · and blasting. In drilling, there is now available advanced use of GPS guided drilling systems that continue to grow and improve precision and effi ciency. Drill depths are accounted for more accurately, making it easier to assign the right amount of explosives in blasting. New GPS-enabled applications have improved strata recognition ...

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  • BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

    The drilling pattern (drilling geometry) depends on certain parameters of which the blast-hole diameter is one of the most important. The following is a simple guide for estimating a suitable drilling pattern for bench blasting. It includes the different variables that affect the blasting result. d, blast hole diameter, mm.

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  • Bench Blasting – Rock Blasting Services

    Based on desired blasting inputs such as face co-ordinates, hole diameter, pattern layout, face rock characteristics and location, face profile, hole diameter, pattern layout, desired fragmentation size, explosives and initiating devices, environmental constraints, BLAST DESIGNER SOFTWARE (BLADES) calculates blast plan parameters, explosives charge distribution, initiation timing and …

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  • Blast Hole Drilling: The Basic Process | RPM Drilling

    3. Smooth blasting or normal blasting of the contour. 4. Hole diameter . 5. Collaring deviation . 6. Angular deviation . 7. Planned advance or hole depth . 8. Types of blasting agents and degree of packing . 9. Weight strength of the explosives . 10. The toughness of the rock described by a rock constant . 11. Cost of the drilling equipment and ...

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  • Designing Blast Patterns Using Empirical Formulas

    2014-4-2 · Empirical formulas that may be applied to drilling and blasting pattern design..... 6 Calculation of burden, B, from equation 1 ... Blasting pattern dimensions for Wisconsin, Milwaukee County, Quarry No. 8..... 23 10. Blasting pattern dimensions for Wisconsin, Racine County, ...

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  • Drill & Blast Best Practices Part Two: Drill Pattern ...

    2020-5-18 · Drill Pattern Design and Results Simulation. All of this so far is just a part of creating an effective drill pattern design. Other fundamentals are the analysis of the bit diameters available for drilling, pattern geometry calculation, determination of angles, azimuths, and sub-drillings, as well as calculating the final depths of the holes to be executed.

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  • SOME METHODOLOGICAL DRILLING - BLASTING

    2018-1-18 · The process of organizing the drilling and blasting operations involves successive schedule of the operations in order to effectively and safely perform these two working operations. The Figure 1 shows the model of organization of drilling and blasting in the case when, as a method of blasting the smooth blasting is applied (Dambov, 2014).

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  • BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

    2017-5-9 · and blasting. In drilling, there is now available advanced use of GPS guided drilling systems that continue to grow and improve precision and effi ciency. Drill depths are accounted for more accurately, making it easier to assign the right amount of explosives in blasting. New GPS-enabled applications have improved strata recognition ...

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  • FIRING PATTERNS AND ITS EFFECT ON MUCKPILE SHAPE ...

    2019-4-21 · shorten the work time. Drilling and blasting cost in open pit mines represent 15-20% of the total mining cost [1,2,3]. Apart from the direct costs, blasting efficiency also influences down the line mining costs. Firing pattern that provides a pathway for the detonation wave of initiation for the explosive charged in the holes. In any

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  • Blast Hole Drilling: The Basic Process | RPM Drilling

    Drilling. Most blasting in mines involves charging explosives into holes drilled in rock. The entrance or mouth of a drill hole is called the collar and the end is the toe. Drilling is still carried out in some cases, in the ASM sector, by hand, using a hammer and chisel. This is obviously tedious and slow, especially in hard-rock mining ...

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  • Drilling and Blasting | Technical Aspects of Mining ...

    Advanced blasting technology and clever blast design can improve the utilisation of the drilling fleet and reduce capital and operating costs without compromising productivity. Matching explosive energy to geology enables expanded patterns without affecting fragmentation.

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  • Drilling, Charging and Blasting Productivity

    We contact any local law enforcement, fire departments, and emergency response prior to blasting operations. In addition, we contact anyone within a 300 foot radius from a blasting operation. This is done verbally and/or by letter. This is standard for any project we do. Permits for blasting are also handled by McCallum Rock Drilling.

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  • Quarry Drilling & Blasting | McCallum Rock Drilling

    2020-6-16 · drilling pattern in underground coal mines and all 7 types of blasting design patterns like wedge cut drilling pattern, pyramid cut drilling pattern. pyramid cut में drilling hole, Face के मध्य भाग से 0.7 - 1 मीटर की दूरी पर round shape में ...

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  • A Pattern For Improvement | Agg-Net

    2021-6-9 · A firing pattern is like an electrical circuit, providing a pathway for a detonation wave in order that explosive charges in the blastholes can be initiated. In any blasting programme the foremost requirement is sequential generation of free face (with the blast progression).

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  • Best practices: Drilling and blasting : Pit & Quarry

    2019-3-25 · Blasting Safety with Proper Techniques. ENVIRONMENTAL ISSUES Blast holes can be drilled in either To overcome these hazards, Ground Vibration, Air Blast, Fly Rock, square pattern or staggered Premature Detonations and Misfires proper blasting pattern to be pattern. IMPORTANT designed and followed as A staggered pattern produces a free faces given in the Table below; …

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  • Drilling & Blasting Pattern | Nature - Scribd

    Advanced blasting technology and clever blast design can improve the utilisation of the drilling fleet and reduce capital and operating costs without compromising productivity. Matching explosive energy to geology enables expanded patterns without affecting fragmentation.

    Get Price
  • Drilling, Charging and Blasting Productivity

    Drilling. Most blasting in mines involves charging explosives into holes drilled in rock. The entrance or mouth of a drill hole is called the collar and the end is the toe. Drilling is still carried out in some cases, in the ASM sector, by hand, using a hammer and chisel. This is obviously tedious and slow, especially in hard-rock mining ...

    Get Price
  • Drilling and Blasting | Technical Aspects of Mining ...

    Blasting Pattern: The blast holes are made and cleaned by using the tools. The charge of explosive placed at the bottom. Remaining portion is filled with clay and tamped. Fuse is inserted,kept projecting 15-20 cm above the rock surface. Thereafter free end of fuse is fired by the detonator.

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  • Write short note on: Drilling & Blasting Equipment's ...

    2018-10-30 · Sub-Drilling Part 1. In this two part post we are going to talk about sub-drilling. What is sub-drilling, why we do it, when we do it, and how much we do it. When explosives are detonated, they are expanding rapidly and are ultimately going to take the path of least resistance. This is one of the known constants of drilling and blasting with ...

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  • Sub-Drilling Part 1 | McCallum Rock ... - Drilling & Blasting

    2020-6-16 · drilling pattern in underground coal mines and all 7 types of blasting design patterns like wedge cut drilling pattern, pyramid cut drilling pattern. pyramid cut में drilling hole, Face के मध्य भाग से 0.7 - 1 मीटर की दूरी पर round shape में ...

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  • Best practices: Drilling and blasting : Pit & Quarry

    2019-3-25 · Blasting Safety with Proper Techniques. ENVIRONMENTAL ISSUES Blast holes can be drilled in either To overcome these hazards, Ground Vibration, Air Blast, Fly Rock, square pattern or staggered Premature Detonations and Misfires proper blasting pattern to be pattern. IMPORTANT designed and followed as A staggered pattern produces a free faces given in the Table below; …

    Get Price
  • Drilling & Blasting Pattern | Nature - Scribd

    2019-8-28 · P&Q University Lesson 4: Drilling & Blasting. The initial production steps in a quarry operation – drilling and blasting ­– can significantly impact the productivity and costs of most downstream operations, including loading, hauling, crushing and screening, and product yield – the relative volume of high-value crushed stone products ...

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  • P&Q University Lesson 4- Drilling & Blasting : Pit & Quarry

    2009-8-26 · with extensive blasting tests de-signed toachieve thesameorbetter fragmentation with vertical drilling aswasbeing achieved with inclined drilling. Thechange tovertical holes isdiscussed in some detail in the next section ofthis paper. By1972, however, the pattern forfresh car-bonatite, phoscorite, andpyroxenite was standardized at 6,7m burden

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  • Thedevelopment ofdrilling andblasting practice atPalabora ...

    2018-4-25 · Underground Blasting Technology _____ REVEY Associates, Inc. 2010 Page 6 Rock Structure: (cont.) However, the loosely cemented clinker had great influence on drilling and blasting productivity. Drilling in the crumbly clinker zones was extremely difficult.

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  • TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST

    2011-4-1 · Drilling and Blasting at Bodie . By. Michael H. Piatt . The only way to get ore out of the ground is to dig it out. The methods employed at Bodie had been adapted from eastern coal mining, then perfected on the Comstock during the 1860s. They remained essentially the same throughout the mining West.

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  • Bodie History: Drilling & Blasting in the Bodie Mines

    Blasting Pattern: The blast holes are made and cleaned by using the tools. The charge of explosive placed at the bottom. Remaining portion is filled with clay and tamped. Fuse is inserted,kept projecting 15-20 cm above the rock surface. Thereafter free end of fuse is fired by the detonator.

    Get Price
  • Write short note on: Drilling & Blasting Equipment's ...

    2020-6-16 · drilling pattern in underground coal mines and all 7 types of blasting design patterns like wedge cut drilling pattern, pyramid cut drilling pattern. pyramid cut में drilling hole, Face के मध्य भाग से 0.7 - 1 मीटर की दूरी पर round shape में ...

    Get Price
  • Drilling & Blasting of Underground Stopes

    3 Results and Discussion 3.1 Optimisation of the Drill and Blast Parameters for the Mine Fig. 1 Total Cost per BCM of Drilling and Drilling and blasting operations of the mine were Blasting in Block A Pit closely studied to identify alternative geometric parameters for blasting based on the Kuz-Ram fragmentation model that reduces the total ...

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