The driller should also document changes in the color or. Assessment of the mwd logs to define a new fracturing index for geotechnical. This manual was designed to provide a systematic approach to surface blast design. Blast plan a written procedure that details the methods and manner by which a project blaster will comply with pertinent laws, rules, regulations, and contract documents. Issue and explain the blast hole drilling program to team members and others involved, for the safe, effective and efficient implementation of the program. Thus, for example, the maximum recommended drill hole diameter for a mine that plans to develop a 60foot bench would be 605 or up to 12 inches.
Rock blasting and control overbreak fhwa us department of. A best practice would be to profile both before and after drilling. For example, minimum bench height when using 76 mm drill holes is 0. An extremely flexible miningduty articulated boom drill that can be used in a variety of applications, including presplit, production or auxiliary drilling. A signed copy of the drill log shall be provided to the mine operator and a copy shall be included in the record of the blast. Our sandvik dr460 dieselpowered, crawlermounted rotary or downthe hole dth blasthole drill is a leader in its class, specifically designed for the highest drilling productivity, reliability and ergonomics. Blast design 211 conditions can be very helpful in designing and loading the blast.
Drilltech, dk45ks, blasthole drill 7 upgraded in 2014 to hole diameter of 140mm229mm to depth of 48 meters. The blast hole size is the first consideration of any blast. Matrix has served the mining industry for over 40 years designing and building drilling tools recognized for their quality and performance. Our sandvik 1190e electricpowered blasthole drill is designed for coal and metal mining applications. Though drilling cost in a sixinch hole in similar material will be at least twice that for the smaller hole, less expensive explosives usually can be utilized in the larger hole with no sacrifice in explosive performance.
Blasthole sampling vs reverse circulation sampling. Highperformance drill and blast methods for tunnel construction require that each of the individual working elements that constitute the construction process are optimized and considered as a system of sequential and parallel activities. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. This is achieved by coupling the conventional bhr waves on to a steel drill. The result of rock blasting is often known as a rock cut. The drill bit is a hollow solid steel material with approximately 20mm thick tungsten rods which hold the drill bits. Drill and blast tunneling practices gerhard girmscheid1 and cliff schexnayder, f. Blast hole drill rig cummins qsk19 diesel deck engine ir hr2. This unit covers the conducting of surface blast hole drilling operations in resources and infrastructure industries. Blasting is a hazardous component of surface mining.
The post drilling survey will indicate how well the blast design was. Blastlogic is an allinone solution adding value to open cut operations through streamlined drill and blast design, tracking and analysis. Blasting injuries in surface mining with emphasis on flyrock and blast area security abstract problem. We are the manufacturer, supplier and service providers of our inhouse designed equipment like crawler drills, hydraulic crawler drills, selfpropelled crawler drills, blast hole drills, gas hydraulic rock breakers, pedestal boom breakers and hydraulic attachments. The focus in this paper is the selection, application and optimization of long hole drilling equipment at mining operations shallower than 2 000 meters. The drill uses a pneumatic reciprocating pistondriven hammer to energetically drive a heavy drill bit into the rock.
Our sandvik d245s dieselpowered, crawlermounted rotary blasthole drill is a productive and costeffective machine ideal for coal, copper and gold mining. Our sandvik d75kx blasthole drill is built upon the proven design and reliability of our diesel powered rotary blast hole drills with added intelligence and improved operator ergonomics, providing operators with the right balance of reliability and technology. A system to automate the blast hole drill logging and blast design process was devel oped and tested. In the program there is a limitation, which does not allow too small bench heights in relation to the hole diameter. Collaring deviations, or the lateral displacement of a hole from its planned starting point. By correlating measurable parameters such as drilling rate. This diagram shows the drill hole charged with explosives at a depth.
Dec 07, 2015 drill holes need to be placed at their proper position on the bench top and bottom of the hole to proper depth in an overall condition that will allow explosives to be loaded into them, and with all details documented in a drill log for communication to the blasting contractor. With a wide range of automation features to choose from you can find the perfect solution for your needs. I cannot agree more that the bias of collected sample from blast hole compared to rc is great to say the least. Dth products are manufactured in mansfield, texas mexico city, mexico, poona, india and sandviken, sweden.
Issue and explain the blast hole drilling program to team members and others involved, for the safe. Optimized design of drilling and blasting operations in. On this page you will find useful resources about opitblast like manuals, updates, and some technical papers. Thus, for example, the maximum recommended drillhole diameter for a mine that plans to develop a 60foot bench would be 605 or up to 12 inches. Drill and blast tunneling practices ctt consulting. The blasters explosive log appendix d is a prior planning document and checklist used by the head blaster to manage the blast. Blast hole tools archives matrix drillingmatrix drilling. In most situations we drill the blast holes as well as the reamers, however we have also been brought in to drill around existing raise drills to strip them out for a larger ventilation rise.
The blasters explosive log appendix d is a prior planning document and checklist used by the head blaster to manage the blast properly. Blasters training modules module 4 blasthole drilling. Jun 27, 20 improper blast hole drilling can produce rocks that are oversize and thus unusable for the purpose intended for the gravel being crushed. It rotary drills holes with a diameter of 127203 millimeters 58 inches, and at a maximum. Epiroc can offer the most comprehensive line of rotary blasthole drilling rigs in the industry. Sandvik d45ks dth blasthole drill for coal, gold and iron. Dth downthehole hammer long hole drilling is another technique utilized and offers some advantages over drifter drilling. Drill monitoring systems and the integration with drill and.
Improper blast hole drilling can produce rocks that are oversize and thus unusable for the purpose intended for the gravel being crushed. The size of the mast and drill steels carried by the rig are important considerations in drilling. Subs need to be tough to hold up under the unrelenting stresses of blast hole drilling. Sandvik d45ks dth blasthole drill for coal, gold and iron ore. This includes the ability to carry out the following as required to conduct surface blast hole drilling operations. Specalog for md6250 rotary blasthole drill speficiations. Optimized design of drilling and blasting operations in open. Minimum accepted bench height meter is equal to hole diameter mm 100. It drills holes with a diameter of 229 349 millimeters 9. Drill monitoring systems can be divided into two basic categories. Minings most advanced drill and blast system maptek blastlogic lowers risk and provides better results and greater productivity.
Drill monitoring systems and the integration with drill. Midrange drilling rigs can meet your demands from 4 up to 10 hole diameter and the largerange drilling rigs for needs between 10 up to 16. This machine was built by the sandersoncyclone drill co. Blasting injuries in surface mining with emphasis on. It drills holes with a diameter of 152 229 millimeters 6 9 inches down to a maximum depth of up to 63 meters 208 feet. Chapter 8 blast design figure 82 staggered pattern figure 83 sing figure 81 square or rectangular pattern. Long hole drilling for the platinum industry a mining. Afum, b o and t emeng, v a 2014, r educing drill and blast cost through blast optimisation a case study, 3 rd umat biennial internat ional mining and mineral conference, pp 7145. Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages. In this type of drilling methodology, a piston driven hammer generally pneumatic reciprocating type drives heavy drill bit into the rock with a lot of force. 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. Prepare drilling logs and other reports that document time, materials, and drill.
Using the best usa produced alloy steel is a good starting point. This machine is designed to deliver an up to 10% maintenance and repair cost advantage and. A low center of gravity and robust structures allow the zt44 surface drill to maneuver in the toughest environments, both in mines and in quarries. The drill log shall include, at minimum, the name of the driller, borehole diameter, borehole depth, depth of broken material at the collar, and other geological conditions for example, cracks, seams, voids, mud, or other anomalies that could affect the blast encountered during drilling. Blast pattern the plan view of the drill holes as laid out for blasting. In order to collect data on the drilling operation, blasthole drills must be equipped with monitoring systems to log the drilling conditions.
Sandvik dr416i rotary blasthole drill for hard rock copper. Driller fills out the drilling log appendix a showing actual depth, cracks, seams and voids. The drill bit is hollow, solid steel and has 20 mm thick tungsten rods protruding from the steel matrix as buttons. Mwd signals in rock discontinuities drilled by jumbo 1 for hole 52 of blast from chainage 747 of. Always number holes left to right along row from behind shot and looking toward face. When these raise drills exceed the optimum drill length of a long hole rig, we will drill them top and bottom. Serious injuries and fatalities result from improper judgement or practice during rock blasting. Who selects the type of drill rig and the hole diameter used in blasthole. Sep 26, 2019 minings most advanced drill and blast system maptek blastlogic lowers risk and provides better results and greater productivity.
Guidance systems for vertical and inclined drilling en. Clearing the toe, and therefore contributing to a smoother floor, is a major asset to. Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. The location of first blast hole, second blast ho le. Chapter 8 blast design figure 82 staggered pattern figure 83 sing. Contamination of open hole drilling alone is a concern but when you also consider sample recovery it must surely prove that blast hole drilling should be used for its purpose and that is to drill a blast hole. Improved technologies in longhole blast hole drilling. Blast hole drilling explained dynamic drill and blast. Implement, monitor and adjust the blast hole drilling program. Rab rotary air blast drilling is used frequently for blasthole drilling. Pdf elements of drill and blast design and 3d visualization in.
The blast delay is illustrated by the sequencing numbers. Blast hole subs, manufactured by matrix, are machined from 4140 alloy steel bar stock that has been heat treated to maximize strength and durability. These can all be avoided with the correct selection of hole size, pattern size, charge height, stemming height and hole depth. Our rotary blasthole drills are productive solutions for all mine types. A head blaster should not rely on memory to conduct any blasting operations. Blastlogic drill and blast management mining technology. Find ingersoll rand and atlascopco for sale on machinio. It includes planning and preparing for operations, marking out drill patterns, operating the drill system, relocation of the drill, and carrying out postoperational procedures. While previous research has focused on optimizing these operations as two separate parts or merely in a specific parameter, this paper proposes a system dynamic model sdm for drilling and blasting operations as an interactive system. Our sandvik dr460 dieselpowered, crawlermounted rotary or downthehole dth blasthole drill is a leader in its class, specifically designed for the highest drilling productivity, reliability and ergonomics. Blasting injuries in surface mining with emphasis on flyrock. The shotfirer must understand the importance of straighthole drilling and drilling errors, the. Find atlascopco, ingersoll rand, kent, caterpillar, hbm, reedrill, and sandvik for sale on machinio. Errors in drill and blast can also result in gravel that is too fine.
This machine is designed to deliver an up to 10% maintenance and repair cost advantage and up to 5% availability advantage. A written plan of the blast needs to be in the blasters possession. Blast hole drilling is used most frequently in the mineral exploration industry. When contemplating a change in drill hole size, compare the area of influence associated with the respective. Clearing the toe, and therefore contributing to a smoother floor, is a. Prepare and present the blast hole drilling program budget in accordance with requirements.
Specific skills are required to achieve the performance criteria in this unit, particularly for the application in the various circumstances in which this unit may be applied. With this version of blastec the nvalue must be determined by the user before running the code. Meeting the needs of drillers around the world we provide quality usedrebuiltnew drilling machinery servicing worldwide needs. Reducing drill and blast cost through blast optimisation a. Our sandvik d75ks dieselpowered, crawlermounted rotary or downthehole dth blasthole drill is a rugged and timetested machine ideal for applications in coal or metal mining. It drills holes with a diameter of 229 to 279 millimeters 9 to 11 inches, with a multipass depth of up to 53 meters 173 feet. Explore the most comprehensive line of rotary blasthole drilling rigs in the industry.
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