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2009-8-26 · blasting commences, thus avoiding hazards posed by falls of ground, fumes, poor working conditions, etc. Speed Drilling of the raise is much faster than handheld operations. Once drilling has been completed, blasting can take place without the interruptions of making safe and drilling the next round. Economy The inside of the raise is never ...
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About EXEL Drilling. EXEL Drilling is a drilling and blasting company based in Mackay, servicing the greater Central Queensland and Bowen Basin regions and specialising in quarrying, coal and metalliferous mining. Independently owned and operated, EXEL Drilling was established in 2007 by Neal Torresan, a seasoned drilling professional with over ...
Drilling Pattern: Selection of drilling patter varies with type and size of drill's used, ... These also pay an important role in geological investigations, in mining surveys and in foundation design for bridges, dams, factories and tall buildings by enabling extraction of cores from the interior of the earth. ... Blasting Pattern: The blast ...
2018-2-10 · Drilling Patterns . Various drilling patterns have been developed for approaching the blasting of drifts which are described in the following sub-sections. These patterns refer to the pattern of the initial cuts which are then blasted into from surrounding holes.
Open Pit Blasting Pattern Design Here is a new style of form that has calculation of Open Pit Blasting Pattern Design. With this form you can register your email and then calculated fields will be sent to you via e-mail with pdf format. I think this form is more useful and easier way to share…
2010-9-7 · FIGURE I. SUrracc mine blast design and consultant system to diagnose apparent blasting prob lems based on post-blast observa-empirical studi es which are well documented in the literature. A tions. The two modules can be used independently or sequentially . If the blast was designed outside the
The model firstly illustrates that rock burden for each hole should be sub-divided into thin micro strips/slabs to understand the characteristics of wave transmission through the medium and lastly with the help of beam theory of structural dynamics have put forward a mathematical model to analyze and design an effective smooth blasting pattern ...
2011-8-22 · Drilling and Blasting was looked at closely to find ... enabled Northparke Mine to increase their pattern s dimensions at the same time giving them the flexibility to blast larger, combination (production and trim) shots ... Reducing the Cost of Drill and Blast through Blast Design Optimisation Northparkes Open Cut Mine, Australia Page 2 ...
2013-3-7 · A NEW PERIMETER CONTROL BLAST DESIGN CONCEPT FOR UNDERGROUND METAL/NONMETAL DRIFTING APPLICATIONS Stephen R. Iverson, William A. Hustrulid, and Jeffrey C. Johnson DEPARTMENT OF HEALTH AND HUMAN SERVICES Centers for D isease Control and Prevention National Institute for Occupational Safety and Health
2018-12-5 · Single pass blasting in which the complete loaded design is detonated in a single event has been developed providing holes are accurately drilled. Some raises 20 m long have been blasted and it is obvious that drilling accuracy in these instances is paramount.
2010-2-7 · on-the-fly pattern design, and real-time drill parameter changes will also be discussed. INTRODUCTION The Minntac Mine is a large taconite mining operation in Northern Minnesota. Drilling and blasting requirements include one million feet of drilling per year producing 75 million long tons of crude ore and waste rock.
2010-2-25 · BLAST DESIGN 4.0. BLASTING DESIGN. The first step in designing the cut is to design the blasting such that the ... drilling pattern may be selected. The patterns discussed in the following paragraphs are pertinent to both vertical and inclined holes. Selection of a drilling
2013-3-21 · Back to Basics The Fundamentals of Blast Design Author: Wesley L. Bender ... Spacing – Represents the distance between holes in a row. A drill pattern is always described in terms of burden and spacing, in that order. (i.e., a 6 x 8 pattern has a burden of 6 feet and a ... blast design for those situations. Blasting mats are usually ...
2011-11-7 · Presplit blasting Spacing = 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)
Design of blasting pattern in proportion to the peak particle velocity (PPV): Artificial neural networks approach. ... In all recorded patterns, blast hole depth was 15 m out of which 3.5 m was sub-drilling. Stemming varied between 6 and 7 m. Number of blast holes in each row and the number of rows were determined based on dimensions of the ...
2018-9-25 · collectively made the drilling and blasting technique prevail so far over the mechanical excavation methods. Since tunnels of different sizes and shapes are excavated in various rock mass conditions, appropriate blast design including drilling pattern, quantity and type of explosive, initiation
2018-2-26 · optimization on the overall blasting process. This model is based on blast pattern expansion with automatic adjustment of the burden, spacing, stemming, sub-drilling and number of holes in order to guarantee the production demands in terms of blasted volume. Hole geometry, bench-high, rock factor and explosive information are used as inputs.
2013-9-23 · Trench Blasting with DYNAMITE. ... explosives distribution, correct delay pattern and drilling accuracy. UNIGEL is recommended for rock conditions that are soft ... drill patterns can be kept within design parameters. The best initiation system for trench blasting, electric or
Drilling: Drill the holes according to the pattern design. Fill the holes: Fill the holes with explosive material and then stemming with raw material (you can fill with material that extracted from hole by drilling machine). Do not forget to get a good stemming. Correct stemming will give you controlled and smooth blasting …
blasting pattern in opencast iron mines - EPC, Mining ... blasting pattern in opencast iron mines - … drilling blasting in opencast iron ore mine « coal crusher, drilling blasting …
The team at Total Drilling Services Pty Ltd are dedicated professional drilling and blasting specialists. We’ll focus all our resources on your drilling and blasting needs allowing you more time to address other key critical tasks. We offer a range of services to our clients, including: A total design …
2019-6-16 · McMahan Drilling & Blasting, Inc. is a full-service controlled drilling and rock blasting company that specializes in rock blasting and breaking for commercial and residential foundations and utilities. Since 1983, our family business has successfully completed thousands of rock blasting projects across the Southeast.
2009-4-30 · DESIGN OF SURFACE BLASTS- A COMPUTATIONAL APPROACH ... drilling and blasting continue to dominate the production due to its applicability in wide geo-mining condition. - 2 - Therefore, to minimize the cost of production, optimal fragmentation from properly designed blasting pattern has to be achieved. Large fragments adversely affect the ...
2015-7-14 · This requires an evaluation of the component costs, which include drilling, blasting, loading, hauling and crushing costs. ... These variables are powder factor, drilling delay ...
Basic blasting 1. PELEDAKAN TAMBANG TERBUKA Disajikan dalam : RAKER INTERNAL PT. ... MAJOR FACTORS INFLUENCING BLAST EFFICIENCY ATTITUDE COMMUNICATION BLAST DESIGN GEOLOGICAL EFFECTS ... APPROACH TO ACHIEVING OPTIMUM BLAST EFFIENCY Blast Design Design Refinement Bench Preparation Performance Evaluation Pattern Layout Firing Drilling …
2005-6-23 · Monitoring 14.2 6 Vibrations from Non-Blasting Events 14.2.7 Blast Design Patterns for Safe and Optimal Excavation 14.2.8 Drilling Pattern 14.2.9 Charge Factor and ...
Best practices: Drilling and blasting. ... So instead of that approach, design and prepare the bench to accommodate your blast design. This will help maintain a straight face and improve the overall consistency of the blast pattern. P&Q: A number of blasting jobs are contracted out. Is there anything quarries should focus on doing before a ...
Blast pattern design has direct influence on the time consumption and construction cost of drilling and blasting of tunnels. Tunnel blasting is more complicated operation than open pit blasting because the only free surface that initial breakage can take place toward is the tunnel face. The most important operation in the tunnel blasting procedure
2017-7-4 · the maximum hydraulic radius, a criteria of blast design is defined (hole length, explosive, diameters, etc.) and optimization can be developed, as shown in the Case Study. Blasting modeling and optimization has no meaning without field monitoring and supervision, as both are complementary parts of the same thing.