blast hole drill pattern usage

Just fill in the form below, click submit, you will get the price list, and we will contact you within one working day. Please also feel free to contact us via email or phone. (* is required).

  • Drilling patterns - QueensMineDesignWiki

    2019-6-28 · In this pattern aligned fans of drill holes are used with the one end of the fan’s holes at the steepest angle to create the initial cut for subsequent blasts to be shot into. These cuts are particularly useful as they do not require the large reamed holes that other blasts require to create the initial cut although they lack the ability to drive deeper cuts.

    Get Price
  • Chapter 8 BLAST DESIGN - NPS

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

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

    2008-5-22 · systems are available on many drill-rig models to help control fugitive dust. Rubber skirts and water-misting controls contain rock fines and dust around the blasthole collar. Cyclone mechanical dust collectors remove drill cutting from the hole collar and place them alongside the drill rig. Cyclone systems reduce the dust in the air and

    Get Price
  • PRODUCTION DRILLING

    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.

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

    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 conditions.

    Get Price
  • TUNNELS, SHAFT AND DEVELOPMENT HEADINGS BLAST

    2018-4-25 · 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 tunnelsand raises, and in shafts of all Mechanized Hydraulic Jumbo Drill sizes, hand held drills are often used to drill holes ranging from 32 to 41 mm (1 ¼ to 1 5/8 in). When mechanized jumbo drills are used, typical borehole size ranges from 41 to 51 mm (1 5/8 to 2 in). When possible, larger holes …

    Get Price
  • training.gov.au - RIIBHD301A - Conduct surface

    2020-12-3 · This unit covers the conducting of surface blast hole drilling operations in resources and infrastructure industries. It includes planning and preparing for operations, marking out drill patterns, operating the drill system, relocation of the drill, and carrying out post-operational procedures. Application of …

    Get Price
  • Blast hole drill - SlideShare

    2021-4-19 · 1 Plan and prepare for surface blast hole drilling operations. 1.1 Access, interpret and apply surface blast hole drilling documentation and ensure the work activity is compliant. 1.2 Obtain, interpret, clarify, confirm and apply work requirements and procedures. 1.3 Access, interpret and apply geological and survey data.

    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, humidity, signs ...

    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 DELAY PATTERNS ... When contemplating a change in drill hole size, compare the area of influence associated with the respective. 119 holes. Whereas a three-inch diameter hole has an area of 7.07 square inches, the six-inch diameter hole ...

    Get Price
  • Designing Blast Patterns Using Empirical Formulas

    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

    Get Price
  • Blast Patterns The three drill patterns commonly used

    Blast Patterns The three drill patterns commonly used are square, rectangular, and staggered. The square drill pattern (figure 19-7) has equal burdens and spacing, and the rectangular pattern has a larger spacing than burden. In both the square and rectangular patterns, the holes of each row are lined up directly behind the holes in the preceding row. In the staggered pattern (figure 19-8 ...

    Get Price
  • Blast Hole Drilling: The Basic Process | RPM Drilling

    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.

    Get Price
  • Operational Design Tips for the Drill and Blast Engineer

    Average overall system usage increased by 54% as personnel focused on role specific value-adding tasks interlinked within the drill and blast process and critical to desired outcomes. This enabled the start of more integrated work practices and a breakdown in functional siloed behaviour.

    Get Price
  • Rock Engineering Practice & Design

    2020-4-22 · Blast volume (V) = B x S x BH x N Blasted tonnes (T) = 3V x Density of rock in t/m Volume of blasthole (Vb) = π x D2/4000 x L Mass of explosive per hole (kg) = Volume of hole length charged x Explosive density PF (kg/m3) = Total explosives in the blast/blast volume PF (kg/t) = Total explosives in the blast/blasted tonnes

    Get Price
  • Mining Drilling Rigs and Blast Hole Drill -

    Our Blast hole drill is in various rod handling capacities, sizes, and angle drilling options. Known for excellent performance, efficiency, and low maintenance, our range finds application in mining and exploration industry. Our Mining drill rigs are specifically designed for blast hole drilling to increase production and reduce down time.

    Get Price
  • Drill and Blast Method - rail system

    2019-7-19 · blast 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
  • DRILLING AND BLASTING DESIGN BASED ON

    2009-8-26 · ‘DTH’ (down-the-hole hammer) long hole drilling is another technique utilized and offers some advantages over drifter drilling. Some advantages could be: Hole accuracy is much improved due to larger blast holes, hammer action down the hole and more rigid drill pipe Hole lengths of up to 60 m can be drilled with acceptable accuracy

    Get Price
  • P&H Blasthole Drills - Surface Mining | Komatsu

    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
  • Improved technologies in longhole blast hole drilling ...

    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 sequence ...

    Get Price
  • Operational Design Tips for the Drill and Blast Engineer

    2021-7-11 · We are not suggesting that conventional open blast hole drilling rigs be replaced with RC rigs to drill the blast holes. We are advising the use of RC rig(s) in conjunction with the existing blast hole fleet to carry out multi-bench, angled RC grade control holes ahead of the blast hole rigs.

    Get Price
  • Designing Blast Patterns Using Empirical Formulas

    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

    Get Price
  • blasthole drilling in open pit mining rock

    Blasthole Drilling In Open Pit Mining Rock. Blasthole Drilling In Open Pit Mining Blast 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 associated mining activity

    Get Price
  • Open Cut Drill & Blast - Maptek

    2020-4-6 · Open Cut Drill & Blast includes specialised tools for designing drill patterns on pit benches. An existing polygon object is required to generate a drillhole pattern. Blast design options include: • Create rectangular, triangular and equilateral patterns • Create vertical or inclined holes on flat, inclined or undulating surfaces

    Get Price
  • iron ore blasthole patterns - BINQ Mining

    2013-2-7 · drill pattern blast design underground drifting tunnel – OneMine …. Steel company blast furnaces consumed more than 98% of the iron ore and … Open Cut Mining-Blast hole … jumbos using index- ing device to provide pattern …»More detailed

    Get Price
  • Mining Drilling Rigs and Blast Hole Drill -

    Our Blast hole drill is in various rod handling capacities, sizes, and angle drilling options. Known for excellent performance, efficiency, and low maintenance, our range finds application in mining and exploration industry. Our Mining drill rigs are specifically designed for blast hole drilling to increase production and reduce down time.

    Get Price
  • Improved technologies in longhole blast hole drilling ...

    2009-8-26 · ‘DTH’ (down-the-hole hammer) long hole drilling is another technique utilized and offers some advantages over drifter drilling. Some advantages could be: Hole accuracy is much improved due to larger blast holes, hammer action down the hole and more rigid drill pipe Hole lengths of up to 60 m can be drilled with acceptable accuracy

    Get Price
  • Appendix M. Blasting Plan - blm.gov

    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 ...

    Get Price
  • Maptek - Benchmarking drill and blast

    Average overall system usage increased by 54% as personnel focused on role specific value-adding tasks interlinked within the drill and blast process and critical to desired outcomes. This enabled the start of more integrated work practices and a breakdown in functional siloed behaviour.

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

    2019-8-28 · When one takes all the fixed capital, maintenance, and variable consumable costs for a given drill application scenario and applies them to a given hole size at a fixed annual tonnage requirement, on paper, the lower drill (and blast) cost per ton result will always show a lower cost result as you increase the hole size and pattern (burden and ...

    Get Price
  • The Importance of Energy Containment to the Blast

    2013-10-13 · Keywords: fragmentation, stemming, stemming plug, rock breakage, drill & blast, air blast, fly rock. 1. Introduction Breaking rock is the first step in the mining process, and is done so the material can be ... energy in the blast hole at the top of the explosive charge. ... • Potential to increase pattern spread to generate drill-fill-fire ...

    Get Price
  • Appendix M. Blasting Plan - blm.gov

    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 ...

    Get Price
  • blasthole drilling in open pit mining rock

    Blasthole Drilling In Open Pit Mining Rock. Blasthole Drilling In Open Pit Mining Blast 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 associated mining activity

    Get Price
  • PRODUCTION DRILLING

    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.

    Get Price
  • Optimization of Blasting Parameters in opencast Mines

    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

    Get Price
  • Blasting Technique - WOMP

    2017-6-15 · The goals are the development of an effective blast pattern that minimizes cost, maximizes face advance, and provides the desired fragmentation and face profile. In addition to these goals, mines must consider the very real operational problems that occur, such as drill deviation, ground vibration, and deadpressing1 or sympathetic detonation2 ...

    Get Price
  • How to be a Drill and Blast Professional | MEC Mining

    2013-10-13 · Keywords: fragmentation, stemming, stemming plug, rock breakage, drill & blast, air blast, fly rock. 1. Introduction Breaking rock is the first step in the mining process, and is done so the material can be ... energy in the blast hole at the top of the explosive charge. ... • Potential to increase pattern spread to generate drill-fill-fire ...

    Get Price
  • Surface Mine Drilling and Blasting Procedure using

    C620H. The C620H Jack-less blast hole drill is designed to drills holes ranging from diameter of 4-1/2 inch (114.3mm) to 6-1/2 inch (165.1mm) to a maximum depth of 118 ft (36m). The C620H is a built for high efficiency and productivity to drill in medium to hard Limestone, Dolomite quarries and Aggregate mines. Learn More.

    Get Price