# blast hole drill pattern function

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• ### DRILLING AND BLASTING DESIGN BASED ON INVARIABLE

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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• ### BlastHole Drilling Introduction - Hardrockdrills.com

2016-4-21 · The design of the blast and hence the drill pattern is an important step in this process. Simulation of the blast before it happens has become more common recently. Changes in drillhole placement and blast timing can be performed before the drilling operator drills the holes. This approach allows for design changes before a single hole is drilled.

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

2014-6-11 · HOLE 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 hole story: the benefits of drill and blast | Engineer ...

2011-3-28 · Drill & Blast Drill & Blast –– StemmingStemming “Stemming” materials (e.g. pea-sized gravel), are used to top-off the blastholes. The stemming material acts to provide confinement, preventing the explosive gases and energy from travelling (venting) up through the drill hole, and instead are contaid ined wihiithin th k he rock mass.

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• ### Chapter 8 BLAST DESIGN - NPS

2020-4-8 · Fully Automated Blasthole Drilling Becomes a Reality. December 2009| Features. Drill control system that was originally developed to improve fragmentation also allows the operators to avoid dangerous highwalls. By Steve Fiscor, Editor-in-Chief. Automation has become the catch phrase for mining technology improvements.

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• ### Rock Engineering Practice & Design

2017-5-9 · by remote means; drillers can see the patterns from their drill rigs as sent by drill and blast engineers from the ofﬁ ces. Engineers can monitor and follow up drilling progress in real-time from the ofﬁ ces,

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• ### Blast hole drill - SlideShare

Display hole patterns to end users to allow them to orientate and find where they are on the pattern. Turn the follow-me function on to navigate on the pattern as you walk it. Need to add a hole? Easy! Simply tap and hold and the app will capture the approximate location of the hole …

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• ### Blaster's Training Modules - Module 4 - Blasthole Drilling

2008-5-22 · DTH hammers, with the piston in the hole, tend to drill straighter holes at greater depth as compared to OTH drifters. The air-driven piston hammer causes the bit to rapidly impact the rock while the bit is slowly turned. DTH hammers are efficient in hard-rock types. With the hammer in the hole, drill-pipe vibrations are eliminated.

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• ### Chapter 8 BLAST DESIGN - NPS

2014-6-11 · BLAST DESIGN (Figure 8-2) Staggered pattern (Figure 8-3) Sing (Figure 8-1) Square or rectangular pattern. 114 ... Blasting analysis next becomes a function of the energy factor, explosives cost, fragmentation results, and subsequent production. ... of the drill hole. Clearing the toe, and therefore contributing to a smoother floor, is a major ...

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• ### Blast Hole Drilling: The Basic Process | RPM Drilling

2009-8-26 · blast hole pattern and charge have to be integrated for optimal fragmentation to suit the cleaning cycle for maximum production output. Providing that long blast hole drilling is applied as a process in a planned, committed and well-managed manner, the benefits in safety, production and cost over conventional methods should be achievable.

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• ### Long hole drilling for the platinum industry— a mining ...

2012-7-5 · 3.5 : Blast-hole Drill 18 3.6 : Schematic diagram of Jackhammer Drill 20 3.7 : Sequence of initiation in single row blasting 27 3.8(a) : Multi-row firing patterns 28 3.8(b) : Multi-row firing patterns 28 3.9 : Transverse cut pattern 29

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• ### P&H Blasthole Drills - Surface Mining | Komatsu Mining Corp.

2019-3-12 · BLAST HOLE DRILLING SERVICES. Blast hole drilling requires considerable skill and technical competence . to ensure accurate holes that achieve an optimal distribution of explosive . energy. An effective blast delivers finer ore fragmentation, higher waste mining productivity and minimal down-stream costs and provides a material financial benefit.

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• ### Optimization of Blasting Parameters in opencast Mines

2019-7-3 · as 30 m/hr. The flushing of cuttings may be by water, mud or air (rotary air blast – RAB). The circulation can be normal (cuttings up the annulus) or reverse circulation (RC - in which cuttings come up the inside of the drillstring). There are numerous combinations of the various open hole rotary drilling techniques and hole clearing techniques.

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• ### PRODUCTION DRILLING

2017-5-9 · 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 capabilities that help drill and blast engineers develop more appropriate and more suitable blast designs.

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

2020-5-18 · Field Assessment. A good drill and blast pattern design does not start on a blank sheet over a desk, on a computer, nor even inside an office. It begins with a good bench assessment out on the field.Drill and blast engineers and supervisors must visually evaluate factors such as the general conditions of the crest and toe, presence and dip of fractures and joints, loose blocks, …

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• ### The hole story: the benefits of drill and blast | Engineer ...

2016-4-21 · The design of the blast and hence the drill pattern is an important step in this process. Simulation of the blast before it happens has become more common recently. Changes in drillhole placement and blast timing can be performed before the drilling operator drills the holes. This approach allows for design changes before a single hole is drilled.

Get Price
• ### Chapter 8 BLAST DESIGN - NPS

2014-6-11 · BLAST DESIGN (Figure 8-2) Staggered pattern (Figure 8-3) Sing (Figure 8-1) Square or rectangular pattern. 114 ... Blasting analysis next becomes a function of the energy factor, explosives cost, fragmentation results, and subsequent production. ... of the drill hole. Clearing the toe, and therefore contributing to a smoother floor, is a major ...

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• ### Drill and Blast Method - rail system

2014-4-2 · with 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 lime­

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• ### Blast Hole Drilling: The Basic Process | RPM Drilling

2016-2-18 · rotary blast-hole drill string are a tricone bit, stabilizers, drill pipes, shock absorbers, and crossover subs (Gokhale, 2003). The basic function of a tricone bit is to crush the rock formation using teeth or edges, allowing the drill-hole to advance in a specific direction. During this process, the bit undergoes very

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• ### Designing Blast Patterns Using Empirical Formulas

2020-2-3 · 6 7 Blasthole Drills Blasthole Drills Model Hole diameter Single pass Multi pass 44XT 114 mm – 216 mm 4.5 in – 8.5 in 6.1 m plus drill string 20 ft 42.7 m/140 ft (Up to 4.5” pipe)

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• ### Practical Aspects of Blast Hole Drilling - Hardrockdrills.com

2017-5-9 · 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 capabilities that help drill and blast engineers develop more appropriate and more suitable blast designs.

Get Price
• ### The hole story: the benefits of drill and blast | Engineer ...

2016-4-21 · The design of the blast and hence the drill pattern is an important step in this process. Simulation of the blast before it happens has become more common recently. Changes in drillhole placement and blast timing can be performed before the drilling operator drills the holes. This approach allows for design changes before a single hole is drilled.

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

2020-5-18 · Field Assessment. A good drill and blast pattern design does not start on a blank sheet over a desk, on a computer, nor even inside an office. It begins with a good bench assessment out on the field.Drill and blast engineers and supervisors must visually evaluate factors such as the general conditions of the crest and toe, presence and dip of fractures and joints, loose blocks, …

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• ### Blast Hole Drilling: The Basic Process | RPM Drilling

2020-7-14 · • Positioning the drill bit on the arget. • Adding and subtracting drill pipe and Racking pipe in carousel • Proper knowledge and use of cab controls • Bit changes • Propelling hole to hole, pattern to pattern, and on haul roads. • Auto Drill • GUI panel and system navigation • Best Management Practices for Blast hole drills and ...

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• ### ZT44 Blasthole Drill Operator Training - mining.komatsu

2014-4-2 · with 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 lime­

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• ### Designing Blast Patterns Using Empirical Formulas

2020-11-5 · entire shot and will not be used for down hole priming. 6. Drill and Blast Pattern The drilling program will be based on 2 rows of 2-1/2 inch diameter holes drilled with a grid spacing of approximately 3 feet by 5 feet along the ditch line. The drill pattern will be established using a powder factor of about 3.0-4.0 pounds per cubic yard to ...

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• ### Appendix M. Blasting Plan - blm.gov

2012-7-5 · 3.5 : Blast-hole Drill 18 3.6 : Schematic diagram of Jackhammer Drill 20 3.7 : Sequence of initiation in single row blasting 27 3.8(a) : Multi-row firing patterns 28 3.8(b) : Multi-row firing patterns 28 3.9 : Transverse cut pattern 29

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• ### P&H Blasthole Drills - Surface Mining | Komatsu Mining

2018-4-25 · Determining Hole Size: In many practical applications, blast designers must choose from a narrow range of hole sizes decided by the operating limits of pre-existing drilling equipment. In small tunnels and raises, and in shafts of all sizes, hand held drills are often used to drill holes ranging from 32 to 41 mm (1 ¼ to 1 5/8 in). When

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• ### Optimization of Blasting Parameters in opencast Mines

2008-10-13 · higher than the calculated value, no change of the hole pattern is made. Formulas to estimate mean fragment size are found in Fragmentation Distribution below. 1.7 Limitation with respect to relation Hole Diameter/Bench Height In the program there is a limitation, which does not allow too small bench heights in rela-tion to the hole diameter.

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