Open pit blast design pdf

Construct hole templates with design parameters such as fixed or variable collar or toe spacing, angle changes and variable toe horizons. An open pit bench blasting application mining consultant. During mucking, the forms for concrete are placed in position. Blast clearance all time savings in clearance can only be realised at the front end from shutting down pit up until. The book is intended to assist drilling and blasting engineers to understand their current operations and to modify blast designs and field practices to achieve target blasting. As with smooth blasting, but the back holes are simultaneously initiated in a separate blast. 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. Paper open access effect of stemming to burden ratio and powder. The course will provide users with a comprehensive workflow for blast design, from start to finish. Blasting principles for open pit mining, set of 2 volumes. Optimized design of drilling and blasting operations in. Knowing how to layout and load blast holes, run blast reports, edit holes, and adjust explosive tieins will help you create effective designs and increase blast accuracy and blast safety.

Blast master plan at ellatzite med copper mine, the largest open pit operation in. The research was carried out as a practical method on nchanga. In the illustration that follows figure 84 shows a typical bench cut with two free. Information regarding the blast design, the actual explosives loaded and the actual firing sequence should also be collected prior to the blast. It is clear from the definition of our graph g that a graph closure in g represents a physically. Blasting principles for open pit mining download ebook pdf. As a rule, openpit and coal strip mines using large drills will drill presplit holes that range from 9 to 12.

Click download or read online button to get blasting principles for open pit mining book now. Blasts may have to be redesigned or rescheduled for more favorable atmospheric conditions to minimize air waves. Tutorial blast hole shotplus permata indonesia duration. A case study examination of two blast rounds at a nevada gold mine. Measurement of blast damage office of surface mining.

Objectives upon completion of this course, you will be able to accomplish the following. The importance of a systematic approach to mine planning and design using soundly based geotechnical engineering methods cannot be overemphasised. Optimization of blasting design parameters on open pit. Many researchers have considered the common factors in designing the blast layouts for benches in open pits. Assessment of blastinginduced ground vibration in an open. Drill and blast designs are crucial for downstream mining success.

Pt newmont nusa tenggara ptnnt operates the batu hijau coppergold open pit mine, located in the west nusa tenggara province of indonesia. Drilling and blasting in open pit mines represent 15 to 20 % of the total mining cost. Open pit mine planning and design, third edition mining. Lobb abstract blasting is a primary means of extracting minerals and ores at surface mining operations. Concrete is mixed on the surface and conveyed down the shaft in a pipe. The success of achieving these goals depends significantly on good blast design. Parameters considered in open pit bench blast design modified after anon, 2012, t, u, s h, l, d, b t.

Identify trends and improve blasting performance over time. Pdf drilling and blasting practices in nevadas openpit mines. Bmt works with geologists from over 105 open pit operations around the world to accurately measure 3d blast movement so that the ore is sent to the mill and waste ends up in the waste pile. Create rectangular, triangular and equilateral patterns create vertical or inclined holes on flat, inclined or undulating surfaces. Pdf optimisation of drill and blast parameters using.

Optimized design of drilling and blasting operations in open pit. Each blast design requires a plan that take into account each particular rock. When an explosive charge is detonated, chemical reaction occur which, very rapidly changes the solid or liquid explosive. Of course, first stage is always blasting pattern design which were published before in mineblog see open pit blasting pattern design excel sheet or cognito form.

Measuring blast movement to reduce ore loss and dilution. This paper analysed the blast output of boss mining company limited bmcl, an open pit mine in tarkwa in the western region of ghana, using splitdesktop software for fragmentation analysis. Batu hijau is budgeted to produce 140 million pounds of. Audit drill patterns against blast hole distribution and location constraints. Misfires misfires happen when a loaded hole, portion of a loaded hole, or several loaded holes fail to detonate during a blast. Electronically transfer data, respond to changes in realtime, and generate reconciliation reports. Blast design figure 82 staggered pattern figure 83 sing figure 81 square or rectangular pattern.

Batu hijau coppergold open pit mine, located in the. This book addresses the challenge of optimising the design of blasts for open pit mines and quarries. Paper open access related content effect of stemming to. Blastiq blast design and optimisation software for. Pre blast survey face points, crest, toe, top of coal and drill surface points were imported to the software. This unique course enables you to learn the basic theory of open pit mine design and the application thereof, whilst having the chance to interact with experts in the field. Understand pit and dump design concepts create detailed pit and dump designs create road designs incorporating superelevation and vehicle velocities. Ground vibrations and air blast effects induced by blasting in open pit mines. Mineralization, topography, costs and significant goologic feature.

An analysis and prevention of flyrock accidents in surface blasting operations by t. Comprehensive design and modelling capability with shotplus premier for complex blasts large mines with multiple pits can benefit from blast design templates for each pit and separate blast domains within the pit. This may range from one or two metres for small civil engineering blasts to many tens of metres for open pit mine production blasts. Surface blast design download ebook pdf, epub, tuebl, mobi.

In an open pit mine slope, rock mass has multiple joint structures and blasting operations have an obvious influence on its stability. Reduce ore dilution and loss in open pit mines bmt. Technique 2017 estados unidos anew blast vibrations analysis methodology. Bureau of mines, information circular 8550 includes bibliography.

You can do that oldstyle penpapercalculator or you can use designing software specifically focused on blasting like delpat etc. In order to implement an adaptive blastdesign strategy for openpit mines, two problems must first be solved. Books, images, historic newspapers, maps, archives and more. Where possible design switchbacks coincident with a berm so that the turning radius is increased without.

Optimization of blasting parameters in opencast mines. Effective slope design relies on the estimation of rock mass strength. The main purpose of the bench blasting is to facilitate the fracturing and. Optimized design of drilling and blasting operations in open.

Created as an outcome of the large open pit lop project, an international research and technology transfer project on the stability of rock slopes in open pit mines, this book provides an uptodate compendium of knowledge of the slope design processes that should be followed and the tools. Click download or read online button to get surface blast design book now. Drilling and blasting are the two most significant operations in open pit mines that play a crucial role in downstream stages. Development of a blast optimization model selection of proper explosive in any blasting round is an important aspect of optimum blast design. A large number of examples illustrate the application of the principles. In this paper the general principles behind these techniques will be described, the design. In this paper the general principles behind these techniques will be described, the design and.

Several theories have been developed by various authors for estimating open pit blast design parameters such as burden, blasthole spacing, subdrilling, explosive charge distribution in blastholes. Julius kruttschnitt mineral research centre, 1996 ocolc894852908. Adaptive blast design means that the blast design can be modified in real time, by changing hole pat terns or the type and amount of explosive, based on newly acquired information about the rock mass. Case study combined production and trim blasting pt newmont nusa tenggara, batu hijau, indonesia. The results are being integrated into a userfriendly blast design software package.

Open pit mining operations involving several small open pits began in 1981 queenstake, 2006. Optimized open pit mine design, pushbacks and the gap problem. The design of open pit excavations will endeavour to prevent hazardous and unexpected failures of the rock mass during the operating life of the open pit. The first volume introduces basic engineering concepts and the building blocks that make up a blast design. Introduction blasting is the important technique for the size of rock fragmentation in any open cast mine. The influence of slope design has an overriding effect on the economics of an open pit mine. Case of metlaoui mining basin, southwestern tunisia monia aloui 1, yannick bleuzen 2, elhoucine essefi3 and chedly abbes 1faculty of sciences of sfax, road soukra, sfax 3038. Divided into two volumes, this accessible work describes the principles involved in hard rock blasting as applied to open pit mines. Open pits nop ore bench to optimize the blasting design parameters that can yield the required. Graph g with dummy node x0 and arcs added from the dummy node x0 to all other nodes. Building the appropriate policy means it needs to be process. In this study, the blasting vibration signals monitored at a blasting site with different rock masses were used to investigate the attenuation characteristics of. Benches may be designed and carried forth with more. Open pit mines are used when deposits of commercially useful ore or rocks are found near the surface.

Note that the blast damage only extends a limited distance into the slope. This site is like a library, use search box in the widget to get ebook that you want. Isometric view of ashs blast design parameters ash 1963a,b,c,d. Pdf several theories have been developed by various authors for estimating open pit blast design parameters such as burden, blasthole. The second volume goes into more depth to provide a better understanding of the. Vulcan cad pdf vulcan cad provides full design and editing, data importexport, data query and plotting functionality. The templates improve management, control and efficiency of each blast. Mechanism of rock breakage while release of explosives energy upon detonation and other relevant points are discussed below. Therefore, accurately predicting the blasting vibration is necessary to ensure slope stability. A case study examination of two blast rounds at a nevada.

Parameters considered in open pit bench blast design modified after anon, 2012 46 ijstr2015. Oil sands pdf the vulcan oil sands module is tailored to meet oil sands requirements in geologic modeling, reserving, and mine design. Technologies for optimizing drilling and blasting in open. The domestic consumption of explosives and blasting agents during the year 2002 was about 5. Fundamentals of slope design keynote address at slope. Outline introduction drilling explosive used in opencast mine types of variables in blast design blasting patterns used in indian opencast mines concept of optimum blasting. If the blastholes are drilled as a staggered pattern on an equilateral triangular grid, the optimum distribution of the. Controlling fume movement following the blast is not possible and the pit will remain closed until the all clear is established. Pdf application of blast damage when modelling open pit.

Shotplus blast design and modelling software for surface. This writeup is not meant to give straight answers to the blast design parameters, as every single quarry is unique. Pdf lecture 4 open pit mining presentation abdelaziz. Open pit mine design in excel with designxl duration. Datablast is a multiuser system covering the entire open pit drill and blast process from design to infield operations.

Prenn synopsis the model described is a design and economic planning tool for analyzing surface mineral deposhs. An analysis and prevention of flyrock accidents in surface. Perform material typedestination classification in open pit blasts and underground. Drilling, blasting, open pit, fragmentation, kuzram model, modified kuz.

Technologies for optimizing drilling and blasting in openpit. In openpit blasting, the number of free faces and the confinement of the last two rows of holes to be fired are factors to be noted, as well as the relative direction of the blast in re. Understand drill and blast design concepts design simple blast patterns create. Blast design the best use of explosives is made when a blast produces a clean break, giving good fragmentation, while avoiding excessive flyrock. Guidelines for open pit slope design is a comprehensive account of the open pit slope design process. Optimization of blasting design parameters on open pit bench a. This is meant to be a toolbox for blast design in conventional rock quarrying and open pit mines. It presents a practical approach to the design and assessment of blasts, and demonstrates how blasting operations can be engineered not only to solve classic blasting problems, but also to optimise blasting performance to meet the needs of. The shaft bottom is cleaned after mucking, the center line fixed by plumb bob, and the next round drilled.

Bowa introduced a practical method in an open pit mine to optimize blasting design parameters such as bench height, drill hole diameter, spacing, etc. Blast design in opencast mining linkedin slideshare. Open pit mine planning and design is an excellent textbook for courses in surface mine design, open pit design, geological and excavation engineering, and in advanced open pit mine planning and design. The main purpose of this study is to investigate effect of blast design parameters such as burden, blast hole length, stemming length, and powder factor on rock fragmentation. Bla st des igner software blades calculates blast plan parameters, explosives charge distribution, initiation timing and sequence, results in terms of rock breakage and fragment size distribution. Oct 12, 2017 blast design in opencast mines presented by gopal karmakar id 511214015 and jagat kumar id 511214014 mining engineering iiest shibpur 2. Pdf in most of the openpit preciousmetal mines in nevada, there is no clear geological distinction.