mine bench height for blasting

Stiffness Ratio Stiffness Ratio = B H / B where B H is Bench Height B ...

Stiffness Ratio Example What is the Stiffness Ratio for a 40 foot bench with 6.5 feet ... to selectively mine can''t scramble ore face with explosives Working Height of ... localities limit bench height for safety Blast Vibration may limit charge length.

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Improved Blasting and Bench Slope Design at the Aitik Mine

For the footwall, presplit blasting in inclined (70°) holes over the full double-bench height, proved to be suitable in terms of both achievable bench slope...

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Blasting, drilling procedures need to be done professionally

Mar 21, 2017 ... Most mines believe that better blast design will help save costs, improve ... Spacing – 11.5 feet,; Bench height – 40 feet,; Subdrill – 2.5 feet, and...

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A practical method of Bench Blasting design for desired ...

Bench height, hole diameter, spacing, burden, hole length, bottom charge, column charge, stemming, ... In open pit mining where blasting is employed for.

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Open pit mininig - Wassara

Sep 6, 2017 ... When the top hammer is used for drilling blast holes in open pit mining and quarries, the bench height is usually limited by the hammer''s...

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SURFACE MINE BLAST DESIGN AND ... - OhioLINK ETD

levels, such as fair, good, and excellent. In surface mining blasting, the bench height is often an independent variable that is largely determined by the available...

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Download - [email protected]

A comprehensive analysis of blasting data of opencast mines has been conducted ... The basic tenets of the blast design are bench height, burden, spacing and...

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blast pattern – Mining and Blasting

Oct 12, 2012 ... Posts about blast pattern written by PARTHA DAS SHARMA. ... Bench height is usually limited on the low end by the height of the stemming...

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Ore Loss and Dilution -- A Mine Engineering Study - LinkedIn

Jul 1, 2018 ... Bench Height; Minimum Mining Width; Dig Line design ... Blast hole pattern and sampling design can significantly impact the estimation of ore...

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assessment of powder factor in surface bench blasting using ...

It can serve a blast condition to minimize the overall mining cost. .... of holes 7 12 8 14 25 Bench height (m) 11.25 12.6 11.25 14.05 14.5 Length of bench (m) 18...

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Considerations in the Optimisation of Bench Face Angle and Berm ...

The inclination of any mine pit wall is limited by the overall quality and structural complexity of the rock mass in which it is situated. ... Other considerations for bench height and berm width are equipment size, ore selectivity and blasting design.

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Study of the Powder Factor in Surface Bench Blasting - Core

Study of the Powder Factor in Surface Bench Blasting ... for the minimal overall mining cost for a specific blast condition may be .... BENCH HEIGHT Y 12.5m.

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determination of some bench blast parameters using ... - ethesis

4.3.3 Output for the blast sequence of Mine-1. 55-56 ... Pit geometry which comprises of thickness of orebody, bench height, bench slope angle, height to width...

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Improving double bench face performance - Zostrich Geotechnical

impact on the final bench profile by contributing to blast damage of the face. BHP Billiton Diamonds Inc., Ekati Mine Diamond MineTM, has pioneered the usage of a technique that .... For example, the bench face height, face angle, and face.

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Drilling and Blasting Technology Prof. Kaushik Dey ... - NPTEL

Department of Mining Engineering. Indian Institute ... hole, stemming length, sub drilling length, bench height etcetera. ... the blasting done at a copper mine pit.

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optimization of drilling and blasting practices at a western us open ...

predicting the fragmentation distribution from blasting in the mining industry. ...... The bench height can be determined with Equation 2, below (Anon, 2010).

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Evidences of the influence of the detonation sequence in rock ...

Drilling and blasting are fundamental operations in the mining cycle and consti tute ... Key words: Drill & blast; bench blasting; bench blasting; rock fragmentation; ... Changes in the bench height or drill-hole diameter, when the product size is...

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Blast fragmentation measurements in open pits - International Mining

Aug 31, 2017 ... “Quantifying blast fragmentation is useful for measuring blasting ... loss and dilution, the mining schedule, bench height optimization and mining...

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Image Processing based Assessment of Blast Performance in ...

A study was conducted to know the blast performance at two different mines located in .... ejection of 7.42m, whereas the bench height of 7.5m in the same mine...

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Drilling and Blasting

Jun 27, 2012 ... Bench height ... for double bench drilling in special circumstances. ... Blasting operations will be performed by mine personnel on a 7 day per...

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Open Pit Mining - MineralsEd

Open Pit Mining ... the height of the bench in the pit, generally 12-13m. ... mine, availability of equipment, and capacity of the mill, blasting may be scheduled.

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Smooth and Presplit Blasting - Geoengineer

Bench Height, Uneven bore holes, explosive cutoff. << Bench Height, Airblast, flyrock. > ... Blast Damage Mechanisms at EkatiTM Mine by Peterson (2001)...

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Chapter 6 DETERMINATION OF BLAST DESIGN ... - Shodhganga

international practices, some areas have been identified which can lead to bcltci blast performance at surface mines. 6.1 BENCH HEIGHT. The bench height is...

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Chapter 8 BLAST DESIGN

Use bench height plus subdrilling minus stemming. 5. ... The economic analysis of the use of explosives is an important part of blasting operations in mining and.

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Blasting and Explosives Quick Reference Guide 2010

PF (kg/m3) = Total explosives in the blast/volume of rock ... 15 x Bench height (BH) in metres. Bench ...... used in tunnelling and underground mine development.

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Box Cut & Bench | Coal Mining | Height - Scribd

Box Cut & Bench - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. aaaa. ... Explosives and Blasting in UG Coal Mines.

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Blast design in opencast mining - SlideShare

Oct 12, 2017 ... Its a presentation about the design aspect of open cast mine. ... Blasting parameters Bench height – for determining bench height stiffness...

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Optimized design of drilling and blasting operations in open pit ...

Bowa introduced a practical method in an open pit mine to optimize blasting design parameters such as bench height, drill hole diameter, spacing, etc. [5].

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OPTIMIZATION OF BLASTING PARAMETERS IN OPENCAST MINES

Drilling and blasting are the major unit operations in opencast mining. .... The technique depends on factors like bench height and helps in efficient trajectory of.

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Selection of practical bench height in open pit mining using a multi ...

Key words: Open pit mining, bench height, multi-criteria decision making. INTRODUCTION ... practical;. (iv) Blasting of greater blocks is possible, and as a result;.

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Blasting Advice & Consulting - Platinum Blasting - Mining Blasting ...

Enquire today to talk to our blasting consultants! ... Blast timing; Powder factor; Stemming; Fragmentation; Vibration; Overpressures; Bench height and width.

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Chapter 8 BLAST DESIGN

Use bench height plus subdrilling minus stemming. 5. ... The economic analysis of the use of explosives is an important part of blasting operations in mining and.

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Effect of Stemming to Burden Ratio and Powder Factor on Blast ...

basically depends upon the diameter of drilling hole, bench height of the face and the ... In this mine, some blast design parameters like burden (m), Spacing.

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Surface - Blast Design - Office of Surface Mining

design practices for surface-mine and quarry blasting. Surface-Blast Design .... The bench height is usually designed around the safety of the workers and...

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Reducing Drill and Blast Cost through Blast Optimisation – A Case ...

Dec 2, 2015 ... reduce the drill and blast cost of a mine (Anon.,. 2014). This research was ... spacing, blasthole diameter, bench height, sub-drill, stemming and...

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Dilution, ore grade and blast movement calculation model - Maxam

In large majority of open pit mines, bench blasting method is used to allow the removal of ... mine. For example, in a blast zone with 7678m3 of mineral with a grade of. 2.06%, when .... maximum point at half of the bench height. For this reason...

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The Effect of Fragmentation Specification on Blasting Cost - QSpace

Calculation of drilling and blasting costs to produce a certain fragmentation ...... In metal mining the bench height is conditioned by the reach of the loading...

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