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  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Mineral/Ore Mined using the Hardrock Blasthole Drill. Heavy duty Rotary and Down-The-Hole rigs for Blasthole drilling. Open Pit Blast Pattern. Rules of thumb. Burden. 25 to 35 hole diameters; Spacing. Hole size greater than 140 mm (5½') 1.2 to 1.5 burden; Hole size smaller than 140 mm (5½') 1.5 to 1.8 burden; Stemming. 0.7 to 1.3 burden ...

    Get Price
  • Blast Hole Drilling: The Basic Process

    2017-8-24u2002·u2002Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and …

    Get Price
  • Blaster's Training Modules - Module 4 - Blasthole Drilling

    2008-5-22u2002·u2002The components of a drill rig are (1) the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; (2) the mounting; (3) the drill steels or drill string; and (4) the drill bit. There are two basic drilling methods—percussion and rotary—classified in

    Get Price
  • Blast hole drill - SlideShare

    2018-1-23u2002·u2002WHAT IS BLAST HOLE DRILL ? It is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material and detonated. 3. DESCRIPTION Blast hole drilling is most commonly used in the exploration of minerals. Blast hole drilling is …

    Get Price
  • BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

    2017-5-9u2002·u2002help drill and blast engineers develop more appropriate and more suitable blast designs. Engineers can create designs in the offi ce and upload them to the drill rigs by remote means; drillers can see the patterns from their drill rigs as sent by drill and blast engineers from the offi ces.

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

    2019-4-21u2002·u2002blast rounds were drilled on staggered drilling pattern with ANFO as explosive and sensitized emulsion as primer. The blasts were initiated by shock tube system sequencing of 17ms, 25ms and 42ms. was performed by the Front end Backhoe. The blasted muck was loaded on 35 and 50 tonne rear dump trucks. Figure the blast hole .

    Get Price
  • (PDF) ROCK BLASTING FOR MINING - ResearchGate

    Selection of the drilling pattern v aries with the type and size of the drill' s used, depth of holes, kinds of rocks handled, quantity, rapid ity of the explosive & amount of steam ing. An array is

    Get Price
  • Drill and Blast Method - rail system

    Drill and blast method is mostly used method for the excavation throughout the world. The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM. This tunneling method involves the use of …

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  • Chapter 8 BLAST DESIGN - NPS

    2014-6-11u2002·u2002HOLE PATTERNS Hole array is the arrangement of blastholes (both in plan and section). The basic blasthole arrays are single-row, square, or rectangular and staggered arrays. Irregular arrays are also used to take in irregular areas at the edge of a regular array. The term SPACING denotes the lateral distance on centers between holes in a row.

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  • The case for blasthole drill automation - Canadian Mining ...

    2019-2-1u2002·u2002Terrain uses high precision global navigation satellite systems to locate the machine over the hole. The system takes into account the orientation of the drill string in relation to the designed drill pattern to ensure the rig 'touches' centre mass of the hole target with the bit, regardless of mast angle – out to 30° for angle drilling.

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  • (PDF) 3-D Visual Drill and Blast Design - ResearchGate

    The design of drilling and blasting operations using 3-D visual system involves a. series of interrelated steps completed accor ding to the prede fi ned algorithm, as shown. in Figure 1. The ...

    Get Price
  • training.gov.au - RIIBHD301D - Conduct surface blast hole ...

    2020-9-27u2002·u20022.3 Place indicators on drill pattern in preparation for drilling. 2.4 Mark out drill pattern ensuring it is visible and aids the drilling process. 2.5 Protect pre-existing drill holes according to characteristics of hole. 3 Operate the drill system. 3.1 Carry out pre-start, start-up, park-up and shutdown procedures. 3.2 Locate and set up drill ...

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  • Angled Holes Used to Blast Ecess Burden - Dyno Nobel

    2020-8-18u2002·u2002BORETRAK OF ANGLE HOLES MULTI-LEVEL ANALYSIS PROVED SUCCESSFUL FOR THIS BLAST This granite quarry in the Eastern United States currently uses a 12ft x 14ft pattern with a 5.75 inch diameter hole. The quarry uses TITAN® XL1000 and uses DigiShot® for the initiation system. The quarry regularly uses a 2D profile to evaluate each front row hole.

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  • 2020g - Subdrill - The Underutilised Blasting Parameter

    To enable the annual material movement target of 150 million tonne (165 million ton), large rotary drills drill large diameter holes. Historically the production blast designs used subdrill and stemming lengths with standard design factors relative to the hole diameter. As a result, the stemming length was equal to almost 50% of the bench height.

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  • MODEL D - PLASTIC CASING FOR BLAST HOLES - TerraRoc

    2020-10-22u2002·u2002To drill fast and efficient, the system has been designed to directly drill the blast hole after installing the casing with its drill through pilot bit. With this feature the whole process of installing casing and drilling the blast hole can be done with the same rig and in one go.

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  • Blast Hole Drill Operator job with Kinross Gold ...

    Collect drill-hole samples using proper sampling techniques for laboratory analysis as needed. Ability to maneuver on drill pattern using GPS/dispatch navigation system(s). Connects drill pipe sections using hand tools and power wrenches. Safely operate drill equipment with a high degree of competence, skill and proficiency. Maintains radio ...

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  • Explosives Engineers' Guide

    2020-4-22u2002·u2002Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = 1.25 x Spacing

    Get Price
  • Chapter 8 BLAST DESIGN - NPS

    2014-6-11u2002·u2002HOLE PATTERNS Hole array is the arrangement of blastholes (both in plan and section). The basic blasthole arrays are single-row, square, or rectangular and staggered arrays. Irregular arrays are also used to take in irregular areas at the edge of a regular array. The term SPACING denotes the lateral distance on centers between holes in a row.

    Get Price
  • An integrated approach to the drill and blast process ...

    2020-8-12u2002·u2002Blast design and high-precision drilling. A well-designed blast pattern and the effective execution of the blast plan using high-precision drills are an important part of an effective D&B operation. Hexagon's MinePlan portfolio features MinePlan Blast, a comprehensive software utility for D&B and reconciliation. Rather than risking high-wall ...

    Get Price
  • training.gov.au - RIIBHD301D - Conduct surface blast hole ...

    2020-9-27u2002·u20022.3 Place indicators on drill pattern in preparation for drilling. 2.4 Mark out drill pattern ensuring it is visible and aids the drilling process. 2.5 Protect pre-existing drill holes according to characteristics of hole. 3 Operate the drill system. 3.1 Carry out pre-start, start-up, park-up and shutdown procedures. 3.2 Locate and set up drill ...

    Get Price
  • A New Method for Blast Hole Analysis - Thermo Fisher

    2013-8-23u2002·u2002Drill surveys performed to map a reserve prior to opening a quarry are not adequate for day-to-day operation of a limestone quarry because the drill-hole patterns are too widely spaced for sufficient resolution to meet the quarry manager's operational needs. Currently, quarry managers rely on blast-hole

    Get Price
  • (PDF) 3-D Visual Drill and Blast Design - ResearchGate

    The design of drilling and blasting operations using 3-D visual system involves a. series of interrelated steps completed accor ding to the prede fi ned algorithm, as shown. in Figure 1. The ...

    Get Price
  • Designing Blast Patterns Using Empirical Formulas

    2014-4-2u2002·u2002with an uncomplicated, first-approximation method for designing blast patterns, considering geologic structure, and to show the valid use of the technique by comparing drill and blast pattern dimensions used in the quarry with those determined by the presented method. The author visited 12 limexad

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  • Best practices: Drilling and blasting : Pit & Quarry

    2015-12-7u2002·u2002Blasting contractors should lay out the drill pattern based on a surveyed profile of the face. At a minimum, a profile survey should be done after drilling and before loading so that the proper explosive load can be determined for each blast hole based on the survey and drill log. A best practice would be to profile both before and after drilling.

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  • 2020g - Subdrill - The Underutilised Blasting Parameter

    To enable the annual material movement target of 150 million tonne (165 million ton), large rotary drills drill large diameter holes. Historically the production blast designs used subdrill and stemming lengths with standard design factors relative to the hole diameter. As a result, the stemming length was equal to almost 50% of the bench height.

    Get Price
  • Mining Drilling Rigs and Blast Hole Drill - hardrockdrills.com

    2 days agou2002·u2002The cuttings is blown out of hole by air It normally requires mining drill rigs have capacity of 15- 30m depth with 100 – 200mm blast hole diameter. Hardrock blast hole drill machine is dedicating to offer Mining Rigs with the latest and most advanced technology to ensure the most efficient of blast hole drilling and highest reliability.

    Get Price
  • Determining minimum burdens for quarry blasting

    2016-11-18u2002·u2002Changes to Blast design following the introduction of the MEMU Truck The size of the shot-hole diameter increased from 95mm to 110mm. The drill pattern opened up from 3m x 3m (burdens & spacings) to 4m up to 6.5m. The overall number of shot-holes reduced when blasting the same size of …

    Get Price
  • An integrated approach to the drill and blast process ...

    2020-8-12u2002·u2002Blast design and high-precision drilling. A well-designed blast pattern and the effective execution of the blast plan using high-precision drills are an important part of an effective D&B operation. Hexagon's MinePlan portfolio features MinePlan Blast, a comprehensive software utility for D&B and reconciliation. Rather than risking high-wall ...

    Get Price
  • Pipeline & Trench Blasting

    Conventional: This technique uses a staggered, asymmetrical drilling pattern and equal charging in every blast hole. The benefit it provides is less ground vibration, while the drawback is it produces large over-breaks. Controlled: This method utilizes symmetrical drilling patterns and charges blast holes at different levels. Center holes ...

    Get Price
  • Designing Blast Patterns Using Empirical Formulas

    2014-4-2u2002·u2002with an uncomplicated, first-approximation method for designing blast patterns, considering geologic structure, and to show the valid use of the technique by comparing drill and blast pattern dimensions used in the quarry with those determined by the presented method. The author visited 12 limexad

    Get Price
  • A New Method for Blast Hole Analysis - Thermo Fisher

    2013-8-23u2002·u2002Drill surveys performed to map a reserve prior to opening a quarry are not adequate for day-to-day operation of a limestone quarry because the drill-hole patterns are too widely spaced for sufficient resolution to meet the quarry manager's operational needs. Currently, quarry managers rely on blast-hole

    Get Price
  • training.gov.au - RIIBHD301D - Conduct surface blast hole ...

    2021-8-9u2002·u20022.3 Place indicators on drill pattern in preparation for drilling. 2.4 Mark out drill pattern ensuring it is visible and aids the drilling process. 2.5 Protect pre-existing drill holes according to characteristics of hole. 3 Operate the drill system. 3.1 Carry out pre-start, start-up, park-up and shutdown procedures. 3.2 Locate and set up drill ...

    Get Price
  • Mining Drilling Rigs and Blast Hole Drill - hardrockdrills.com

    2 days agou2002·u2002The cuttings is blown out of hole by air It normally requires mining drill rigs have capacity of 15- 30m depth with 100 – 200mm blast hole diameter. Hardrock blast hole drill machine is dedicating to offer Mining Rigs with the latest and most advanced technology to ensure the most efficient of blast hole drilling and highest reliability.

    Get Price
  • KEEPING OPEN OF UNDERGROUND BLAST HOLES R Hawker

    2011-7-5u2002·u2002vibration from adjacent blasting which leads to fretting of blast holes and displacement of wedges of rock, blocking the hole. Ring drilling is more susceptible to blocking than other blasting patterns such as benching, as off-vertical holes have a greater tendency to become blocked. In some instances the blockages can be quickly removed by using

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  • DRILLING AND BLASTING DESIGN BASED ON INVARIABLE

    2019-7-19u2002·u2002blast hole pattern value, m; q i is new specific energy cost, kgm/m3. The analysis of bulk blasts using (3) showed that even drastic change of energy costs (up to two times) and hole pattern (up to 1.5 times) kept good convergence of measured and expected blast results. The important point of the analysis is the flexibility

    Get Price
  • Determining minimum burdens for quarry blasting

    2016-11-18u2002·u2002Changes to Blast design following the introduction of the MEMU Truck The size of the shot-hole diameter increased from 95mm to 110mm. The drill pattern opened up from 3m x 3m (burdens & spacings) to 4m up to 6.5m. The overall number of shot-holes reduced when blasting the same size of rock mass.

    Get Price
  • International Journal of Science &Technology, Reference ...

    2015-9-15u2002·u2002Where; B=Blasting Bu rden (m), S=Blast hole spacing (m), D=blast hole diameter (mm), W=standard deviation of the drilling accuracy (m), L=total charge length (m), H=Bench height (m).Cunningham (1987) notes that the uniformity coefficient n usually varies between 0.8 and 1.5 1.3 Bench Blasting Parameters

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  • Drilling patterns - QueensMineDesignWiki

    2019-6-28u2002·u2002This blast pattern is a variant of the fan cut but all of the holes are angled along the length of the wall that is to be excavated. Burn or parallel-hole cuts This drill pattern uses a series of parallel holes are drilled closely spaced at right angles to the face.

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Mineral/Ore Mined using the Hardrock Blasthole Drill. Heavy duty Rotary and Down-The-Hole rigs for Blasthole drilling. Open Pit Blast Pattern. Rules of thumb. Burden. 25 to 35 hole diameters; Spacing. Hole size greater than 140 mm (5½') 1.2 to 1.5 burden; Hole size smaller than 140 mm (5½') 1.5 to 1.8 burden; Stemming. 0.7 to 1.3 burden ...

    Get Price
  • Blast Hole Drilling: The Basic Process

    2017-8-24u2002·u2002Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and …

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

    2020-5-18u2002·u2002Drill 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.

    Get Price
  • Blaster's Training Modules - Module 4 - Blasthole Drilling

    2008-5-22u2002·u2002The components of a drill rig are (1) the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; (2) the mounting; (3) the drill steels or drill string; and (4) the drill bit. There are two basic drilling methods—percussion and rotary—classified in

    Get Price
  • Blast hole drill - SlideShare

    2018-1-23u2002·u2002WHAT IS BLAST HOLE DRILL ? It is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material and detonated. 3. DESCRIPTION Blast hole drilling is most commonly used in the exploration of minerals. Blast hole drilling is …

    Get Price
  • BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

    2017-5-9u2002·u2002help drill and blast engineers develop more appropriate and more suitable blast designs. Engineers can create designs in the offi ce and upload them to the drill rigs by remote means; drillers can see the patterns from their drill rigs as sent by drill and blast engineers from the offi ces.

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

    2019-4-21u2002·u2002blast rounds were drilled on staggered drilling pattern with ANFO as explosive and sensitized emulsion as primer. The blasts were initiated by shock tube system sequencing of 17ms, 25ms and 42ms. was performed by the Front end Backhoe. The blasted muck was loaded on 35 and 50 tonne rear dump trucks. Figure the blast hole .

    Get Price
  • (PDF) ROCK BLASTING FOR MINING - ResearchGate

    Selection of the drilling pattern v aries with the type and size of the drill' s used, depth of holes, kinds of rocks handled, quantity, rapid ity of the explosive & amount of steam ing. An array is

    Get Price
  • Explosives Engineers' Guide

    2020-4-22u2002·u2002Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = 1.25 x Spacing

    Get Price
  • Drilling patterns - QueensMineDesignWiki

    2019-6-28u2002·u2002This blast pattern is a variant of the fan cut but all of the holes are angled along the length of the wall that is to be excavated. Burn or parallel-hole cuts This drill pattern uses a series of parallel holes are drilled closely spaced at right angles to the face.

    Get Price
  • BlastHole Drilling Introduction - Hardrockdrills.com

    2019-6-4u2002·u2002Mineral/Ore Mined using the Hardrock Blasthole Drill. Heavy duty Rotary and Down-The-Hole rigs for Blasthole drilling. Open Pit Blast Pattern. Rules of thumb. Burden. 25 to 35 hole diameters; Spacing. Hole size greater than 140 mm (5½') 1.2 to 1.5 burden; Hole size smaller than 140 mm (5½') 1.5 to 1.8 burden; Stemming. 0.7 to 1.3 burden ...

    Get Price
  • Blast Hole Drilling: The Basic Process

    2017-8-24u2002·u2002Blast hole Drilling is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material, and detonated. The aim of this technique is to induce cracks in the inner geology of the surrounding rock, in order to facilitate further drilling and …

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

    2020-5-18u2002·u2002Drill 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.

    Get Price
  • Blaster's Training Modules - Module 4 - Blasthole Drilling

    2008-5-22u2002·u2002The components of a drill rig are (1) the rig itself, which supplies the power to mobilize, drill rock, and remove the drill cuttings from the hole; (2) the mounting; (3) the drill steels or drill string; and (4) the drill bit. There are two basic drilling methods—percussion and rotary—classified in

    Get Price
  • Blast hole drill - SlideShare

    2018-1-23u2002·u2002WHAT IS BLAST HOLE DRILL ? It is a technique used in mining whereby a hole is drilled into the surface of the rock, packed with explosive material and detonated. 3. DESCRIPTION Blast hole drilling is most commonly used in the exploration of minerals. Blast hole drilling is …

    Get Price
  • BEST PRACTICES IN DRILL AND BLAST - IQPC Corporate

    2017-5-9u2002·u2002help drill and blast engineers develop more appropriate and more suitable blast designs. Engineers can create designs in the offi ce and upload them to the drill rigs by remote means; drillers can see the patterns from their drill rigs as sent by drill and blast engineers from the offi ces.

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

    2019-4-21u2002·u2002blast rounds were drilled on staggered drilling pattern with ANFO as explosive and sensitized emulsion as primer. The blasts were initiated by shock tube system sequencing of 17ms, 25ms and 42ms. was performed by the Front end Backhoe. The blasted muck was loaded on 35 and 50 tonne rear dump trucks. Figure the blast hole .

    Get Price
  • (PDF) ROCK BLASTING FOR MINING - ResearchGate

    Selection of the drilling pattern v aries with the type and size of the drill' s used, depth of holes, kinds of rocks handled, quantity, rapid ity of the explosive & amount of steam ing. An array is

    Get Price
  • Explosives Engineers' Guide

    2020-4-22u2002·u2002Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock) Burden = 1.25 x Spacing

    Get Price