BLASTEC Orica Mining Services

nimum bench height when using 76 mm drill holes is m. ... Cautious Blasting can be used only for ”Types of Blasts” or ”Deck” ... With this version of BLASTEC the nvalue must be determined by the user before running the code. As a guideline: A high nvalue gives uniform sizing (steep slope), while a low nvalue gives higher ...

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Open Pit Design InterRamp Angles and Volume Changes ...

Notes on Open Pit Design InterRamp Angles and Volume Changes from Bench Geometry. This tool determines the interramp angle for a specified bench geometry and the approximate change (%) in excavation volume due to a change in interramp angle.

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Utilization of blast movement measurements in grade …

UTILIZATION OF BLAST MOVEMENT MEASUREMENTS IN GRADE CONTROL 243 . to minimizing ore movement due to blasting, and methods ... typically five metres in height. Each blast hole is sampled ... typically once for the upper and once for the lower bench. Mining is conducted using a backhoe shovel, situated on the top of the muckpile and the bench is ...

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1. Basic Open Pit Terminology 2. Pickstone Peerless Open ...

Pickstone –Peerless Open Pit Optimisation Input Parameters 3. ... •Bench Height : metres •Batter (Face) Angle (Oxide) : 70 degrees ... in an accurate pit design and costs the drill blast pattern correctly. Minimal sulphide is mined in the oxide mining phase.

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Surface mining planning and design of open pit mining

Surface mining planning and design of open pit mining ... Surface mining 23. ) Bench height The bench height is the vertical distance between each horizontal level of the pit. The elements of a bench are illustrated in Fig. 1. Unless geological conditions dictate otherwise, all benches should have the same height. ... Geita Mining Production ...

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bench height in iron ore mine

height, bench face angle and berm width can be used in the slope design ore selectivity and blasting design. the south african institute of mining and metallurgy Get Price vedanta climbs 3% on sc order on extracted iron ore

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Optimization of Blasting Parameters in opencast Mines

OPTIMIZATION OF BLASTING PARAMETERS IN OPENCAST MINES ... The spacing, bench height, burden, charge per hole as depending on the previous parameters can be calculated. ... adapted by the mining industry to achieve better blasting results. 4 CHAPTER 2 LITERATURE REVIEW . 5

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Blast fragmentation measurements in open pits ...

Blast fragmentation measurements in open pits. Posted by John on 31st August 2017 ... the mining schedule, bench height optimization and mining operating costs. ... International Mining Team Publishing Ltd 2 Claridge Court, Lower Kings Road Berkhamsted, Hertfordshire

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A novel powder factor based bench blast design method for ...

A NOVEL POWDER FACTOR BASED BENCH BLAST DESIGN METHOD FOR LARGE SURFACE COAL MINES by ANDREW CLIFFORD BLAIR A DISSERTATION Presented to the Graduate Faculty of the MISSOURI UNIVERSITY OF SCIENCE AND TECHNOLOGY In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in MINING ENGINEERING 2015 Approved by:

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Bench Blasting Helals

Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, ... · Height of bottom charge h b = x V max ... · / Mining Explosives …

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Selection of practical bench height in open pit mining ...

Selection of practical bench height in open pit mining ... As a definition in open pit mining, bench height is the ... than length of a regular blasting block, and height of the

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Improved Blasting and Bench Slope Design at the Aitik Mine

Improved Blasting and Bench Slope Design at the Aitik Mine PI. Marklund Boliden Mineral AB, ... maximum slope height is about 350 m). Future mining plans call for an increase in annual production up to a ... with smooth blasting near final benches. Ore is transported by .

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mining bench height

Evaluation of Optimal Bench Height Selection for , 2 The bench height is the critical function for deciding ore grade composite for the height of the bench applied for mining This paper deals with evaluating the . Live Chat; mine bench height for blasting crusherasia

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Rock fragmentation control in opencast blasting ...

Rock fragmentation control in opencast blasting. ... (burden × spacing × bench height), and Q is the mass in kg of TNT equivalent explosives per hole. Cunningham (1983) ... For the blasts in sandstone benches of coal mine, stemming length to burden ratio was plotted against mean fragment size.

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Analysis of Safety Aspects And Mining Practices For ...

Analysis of Safety Aspects And Mining Practices For Effective Ground Control in Surface Mining Suresh K. Bhatt, ... determining safe and workable bench height, bench face angle, and bench width. ... use of a spoil bench. Mining Practice Controlled blasting methods are commonly used in Australian mines (6) to maintain pit wall stability. The ...

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An Open Pit Bench Blasting Application Mining Consultant

Bench Blasting Application. Hi everyone, I want to show an application from beginning to end in open pit bench we’re going to explain what we should do in an open pit bench most of mine works which including open pit production methods use almost same stage in blasting.

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Bench interramp overall: A guide to statistically ...

and blasting practices such that the bench design may be refined. Figure 4 effect of discontinuity persistence as a function of bench height Figure 5 comparison of bench face distributions as a function of bench height

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H BLASTING IN SURFACE EXCAVATION Mining and Blasting

BLASTING IN SURFACE EXCAVATION Any blast optimisation programme calls for a clear ... Face height (H): ... A new iron ore deposit is to be worked by surface mining methods with 15 m benches using 150 mm diameter blastholes. Since the prevailing condition is dry rock, it has ...

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Quarries Courses and Live Webcasts Edumine

Online courses, short courses and live webcasts about Quarries for mining and geoscience from Edumine.

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13. Pit Wall Angles and Bench Width – How Do They Relate ...

Pit Wall Angles and Bench Width – How Do They Relate? Date: May 10, ... the structural fabric, and whether controlled blasting is used (minimizing damage to the walls). The BFA may vary around the pit or in different rock types, but it typically is in the range of 60° to 75°. ... Single Bench Height (BH): ...

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explosives – Mining and Blasting

Weblog of Partha Das Sharma For Discussing Various Aspects of Mining, Explosives and Blasting . Menu. Skip to content. Home; About Partha Das Sharma; ... 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 ...

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Economic evaluation of optimum bench height in quarries

Figure 2—Distribution of the cost in a surface mine (%) (Georgen, 1987) 20%—Blasting 33%—Transportation 20%—Primary Crushing 10%—Drilling 17%—Loading. Bench length and width have been chosen to be 100 m and ... growing bench height. Blasting For the explosive material, 5 per cent Al added ANFO with a density of kg/dm3 has been ...

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MODELING BLAST MOVEMENT FOR GRADE CONTROL …

MODELING BLAST MOVEMENT FOR GRADE CONTROL Isaaks E, , MausIMM, Geostatistical Consultant, Isaaks Co., Emerald Hills, CA 94062, ... MAusIMM, MAIG, Senior Mine Geologist, Newmont Boddington Gold, PO Box 48, Boddington WA, 6390. Email; Handayani O, Lead Project Geologist, Newmont Boddington Gold, PO Box 48 ...

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mine bench height for blasting

Economic evaluation of optimum bench height in quarries. 15, 20 and 25 metres and for each bench height, blast hole diameters of 89, 102, 115, 127 and 152 millimetres, as well as for road grades of 8 per cent and 10 per cent.

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Selection of practical bench height in open pit mining ...

Selection of practical bench height in open pit mining using a multicriteria decision making solution. ... Selection of practical bench height i n open pit ... Open pit mining, bench height, ...

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Bench Height | Drilling | Mining Scribd

Suppose Bench Height is Fixed • In a quarry thickness of rock layers may set • May have been set in a previous mine plan • May be fixed by grade control constraints in metal mine • need to be able to selectively mine • can’t scramble ore face with explosives • Working Height of Equipment may Set .

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bench height in iron ore mine

bench height for a small iron mine, being extracted by open pit mining method, has been taken into consideration, taking into account the existing equipment and capabilities. The purpose is to compare two pit schemes with 10 and m bench heights.

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Chapter 8 BLAST DESIGN National Park Service

Chapter 8 BLAST DESIGN (Figure 82) Staggered pattern (Figure 83) Sing ... Use bench height plus subdrilling minus stemming. 5. From Table 4 of Blaster’s Guide, determine pounds/foot of explosive. ... The economic analysis of the use of explosives is an important part of blasting operations in mining and construction. Explosives are energy ...

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Design of openpit mining SlideShare

In case of Backhoe – digging height of machineBench slope 560 to 7002) Dragline:Width of the cut 60mHeight of bench maximum digging depth3) In order to even out the yearly OB removal quantities and the economics sometimes alternative workings and nonworking benches (around 25 …

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ROCK BREAKAGE AND BLAST DESIGN CONSIDERATIONS IN OPENPIT ...

Oct 12, 2012· ROCK BREAKAGE AND BLAST DESIGN CONSIDERATIONS IN OPENPIT. PARTHA DAS SHARMA. 1. Explosives Energy Release and Rock Breakage: Mechanism of rock breakage while release of Explosives energy upon detonation and other relevant points are discussed below: When an explosive charge is detonated, chemical reaction occur which, very rapidly changes the solid or liquid …

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Blast optimization at Kriel Colliery J r n a SciELO

10 m x10 m blast hole pattern and a bench height in excess of 30 metres. The blast holes ... can be done by determining the cost of each mine function (, drill and blast, loading, hauling, etc.) related to the ... H = bench height (m) The other parameters are described above.

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