An Open Pit Bench Blasting Application - Mining Consultant
Dec 09, 2016· Bench Blasting Application Hi everyone, I want to show an application from beginning to end in open pit bench blasting Step-by-step we’re going to explain what we should do in an open pit bench blasting In most of mine works which including open pit production methods use almost same stage in blasting Of course, first stage,
CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE ,
The South African Institute of Mining and Metallurgy , height, bench face angle and berm width can be used in the slope design The bench , designs of blasting for wall stability are an additional criterion The wedge failure mechanism and volume of failed material are illustrated in
Blast fragmentation measurements in open pits Posted by John on 31st August 2017 David Varcoe, Principal Mining Engineer of AMC Consultants notes a recent project in which AMC was involved that required, amongst other activities, a review of options to measure blast fragmentation in an operating open pit mining environment
An Open Pit Bench Blasting Application - Mining Consultant
Dec 09, 2016· Bench Blasting Application Hi everyone, I want to show an application from beginning to end in open pit bench blastingStep-by-step we’re going to explain what we should do in an open pit bench blastingIn most of mine works which including open pit production methods use almost same stage in blasting
INFLUENCE OF AIR-DECK LENGTH ON FRAGMENTATION IN ,
Blast performance, particularly the fragmentation size of the rock, was observed and analyzed, using Spilt Desktop (demo version) image processing software In order to isolate and evaluate the effect of air-deck length, other blast design parameters, such as hole diameter, bench height, burden and spacing were kept similar
Open Pit Mining -refers to a surface mining method where an ore body is extracted in increments to its economic depth , -bench height and width-ultimate haul road-pit floor slope-berm width and interval , -reduced bench heights require more time for bench prep, drilling, and blasting-bench heights allowing single pass drilling offer better .
DESIGN OF SURFACE BLASTS- A COMPUTATIONAL APPROACH , 9 Relationship of bench height, stemming with diameter & UCS of rock , avoiding both fines and oversized fragments to optimize the overall cost of mining In most of the surface mines, blast patterns are established through trial blasts The blast pattern proposed
bench height changes | Coal, Colliery and Mining Forum
Jan 20, 2014· Normally you would use a smaller bench height at the top of a seam as this contains lower or poorer quality material and while it is viable to mine you don't want it mixing with better quality material during processing or refining, as you get into a quality material you increase the shelf height to blast as much out as possible as the largest .
Analysis of Safety Aspects And Mining Practices For ,
determining safe and workable bench height, bench face angle, and bench width To determine the relationship of mine design parameters/practices and effective ground control in surface mining, this study was undertaken It included coal and nonmetal mines, and consisted of four parts: • A review of accident statistics for the 1988-1997 period
Improved Blasting and Bench Slope Design at the Aitik Mine
Improved Blasting and Bench Slope Design at the Aitik Mine P-I Marklund Boliden Mineral AB, Sweden J Sjöberg Vattenfall Power Consultant AB, Sweden F Ouchterlony Swebrec at Luleå University of Technology, Sweden N Nilsson Nitro Consult AB, Sweden Abstract The Aitik open pit mine, located in northern Sweden, currently faces a substantial production increase.
blast dig line polygons by distances indicated by the BMM vectors However, studies of BMM vectors show that blast movement not only displaces material laterally but also mixes material internally within the bench, (Thornton 2009a) This paper presents a method for modeling the post-blast ,
Geotechnical Considerations in Open Pit Mines Version 10 Department of Minerals and Energy Page 3 of 49 10 INTRODUCTION The potentially hazardous nature of open pit mining requires the application of sound geotechnical engineering practice to mine design and general operating procedures, to allow
Bench - inter-ramp - overall: A guide to statistically ,
Let’s clarify this interaction Assume an open pit mine with a substantial overall slope height Now, assume a bench height of 15m, a required catch bench width of 8m with a stability determined face angle of 70° Assume the inter-ramp slope has been determined to be acceptably stable at an angle of 55° with a ramp width of 33m and a
17 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 Minimum accepted Bench Height (meter) is equal to Hole Di-ameter (mm) /100 For example, mi-nimum bench height when using 76 mm drill holes is 076 m
Optimization of Blasting Parameters in opencast Mines
optimization of blasting parameters in opencast mines a thesis submitted in partial fulfillment of the requirements for the degree of bachelor of technology in mining engineering by manmit rout & chinmay kumar parida under the guidance of dr h b sahu department of mining engineering national institute of technology rourkela-769008
Considerations in the Optimisation of Bench Face Angle and ,
Jan 01, 2006· The bench face angle and berm width geometries must be chosen to fit the bench stack angle but must provide a berm that will be capable of catching the volume of failed wedge material from the bench faces above Other considerations for bench height and berm width are equipment size, ore selectivity and blasting design
Surface mining planning and design of open pit mining
Jan 09, 2016· Surface mining planning and design of open pit mining 1 This material is intended for use in lectures, presentations and as handouts to students, and is provided in Power point format so as to allow customization for the individual needs of course instructors Permission of the author and publisher is required for any other usage
Improving Double Bench Face Performance at the Ekati ,
involves drilling, blasting, and excavating the material for the design bench height A second bench is then excavated without the creation of a catch bench, ie only minimal offset from the first bench face is allowed when drilling off the second bench The result is a double high bench face or double bench
Jun 08, 2010· 2 reduced drilling yield and increased drill and blast cost 3 sub grade costs more (relatively larger) 4 reduced shovel productivity Bench Height - Optimization Are bench dimensions always important ? Bench Height and Dilution Watch Your Blasting ! Slope Design : Summary Slope Design: Conclusions 1 Maximize the height of the benches * at .
Jun 14, 2018· Bench height = 15 to 4 times the burden, or possibly higher; Bench height is usually limited on the low end by the height of the stemming column required and its limiting effect on the amount of explosive that can be loaded, and limited on the high end by the height of the digging equipment (for safety reasons)
Jami M Girard , PE, CMSP Mining Engineer, National ,
ASSESSING AND MONITORING OPEN PIT MINE HIGHWALLS Jami M Girard1, PE, CMSP 1Mining Engineer, National Institute for Occupational Safety & Health, Spokane Research Laboratory, 315 E Montgomery Ave, Spokane, WA 99207 ,
controlled drilling and blasting must be needed to allow safe operation of the pit 2 Drilling Production drilling will be done with electric drills with a 15m bench height Similar sites and a study done by Orica (refer to Appendix A – KSM-SABREX Study) show that a drill hole diameter of
PIT SLOPE DESIGN AND RISK – A VIEW OF THE CURRENT ,
bench height, bench angle and berm width This is nearly always the first element of design for an open pit Once this design element is complete it is usual then to evaluate both inter-ramp and overall slop The bench geometry is a function of both geotechnical conditions and mining systems.
mine bench height for blasting vibrating sieve separator Improving Double Bench Face Performance at the Ekati Diamond Mine PDF mining was conducted with a 5130 excavator diagram it can be seen that the single bench height was 15m Trim blasting with a standard double bench was .
Design of controlled blasting (pre-splitting) in Golegohar ,
Safety bench height/m 30 Safety bench width/m 10 Safety bench slope/u 65 Working bench height/m 15 , Dindarloo et al Design of controlled blasting 66 Mining Technology 2015 VOL 124 NO 1 Test no 2 To reduce the blasting power of the explosives used in a pre-splitting row, there are several alternativ First, a
Blast Design and Assessment for Surface Mines and Quarries
Blast Design and Assessment for Surface Mines and Quarries consists of 36 viewing sessions of 30 - 60 minutes each with supporting figures, tables and examples, a glossary of blasting and excavation terminology, and interactive course reviews