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mine bench height for blasting

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

Key words: Open pit mining, bench height, multi-criteria decision making. INTRODUCTION As a definition in open pit mining, bench height is the vertical distance between crest and toe of the bench (Fourie and Dohm, 1992). Determination of optimum bench height is a major concern in most open pit mines. It depends on various factors, such as the cutting height and the bucket capacity of the ...

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mine mine bench height for blasting

mine bench height for blasting 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 . Improved Blasting and Bench Slope ...

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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, ... holes over the full double-bench height, proved to be suitable in terms of both achievable bench slope geometry, and production concerns. For the hangingwall, a presplit blast design is used in specific areas to ensure that sufficient ramp width is achieved. The study reported here has effectively ...

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ASK MINING: Blasting Practices at Open Cast Mines

02/03/2012  Blast Hole Diameter: Up to bench height of 8m, 100mm,, 150mm, 163mm of blast hole diameter is preferred but for bench height > 8m, a minimum of 250mm diameter of blast hole is efficient. 4. Spacing and Burden: In coal measure rocks spacing varies from 3-8m whereas burden is selected about 0.8 times the spacing.

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Mine Bench Height For Blasting

Mine Bench Height For Blasting. We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment, milling equipment, mineral processing equipment and building materials equipment. And they are mainly used to crush coarse minerals like gold and copper ore, metals like steel and iron, glass, coal, asphalt, gravel, concrete ...

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Drill And Blast Best Practices Part One: Bench Preparation ...

13/07/2020  Written by Aron Muniz, Mining Engineer, Drill Blast Specialist, Datamine. Posted on July 13, 2020 October 29, 2020 by Terry Yang. Drill And Blast Best Practices Part One: Bench Preparation. In more than twelve years of working as a Drill and Blast Engineer, I have learnt many great practices on site, and witnessed as many equally questionable ones that I believe should not be propagated into ...

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Pit Wall Angles and Bench Width – How Do They Relate?

10/05/2015  A rule of thumb is that the catch bench width should be according to the formula 4.5m + 0.2H, where H is the height of the bench. This means the recommended catch bench width for a 5m high bench should be about 5.5m; for a 10m high bench it should be 6.5m; and for 15m high bench it should be 7.5 metres.

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(PDF) Optimisation of Drill and Blast Parameters Using ...

Blasting in-situ rock to its desired fragment size requires both controllable (bench height, hole diameter, spacing, burden, hole length, bottom charge, specific charge) and uncontrollable (rock ...

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CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE ANGLE

The South African Institute of Mining and Metallurgy International Symposium on Stability of Rock Slopes in Open Pit Mining and Civil Engineering Ian de Bruyn _____ Page 557 CONSIDERATIONS IN THE OPTIMISATION OF BENCH FACE ANGLE AND BERM WIDTH GEOMETRIES FOR OPEN PIT MINES W.H. Gibson, I.A. de Bruyn and D.J.H. Walker SRK Consulting, Australasia ABSTRACT The

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mine bench height for blasting

Mine Bench Height For Blasting pclconsult. Bench Blasting . Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, and at spacing so that the ANFO (which is a mixture of Ammonium Nitrate[fertilizer] and Fuel Oil [diesel fuel]) as a column charge,together with a bottom . read more. Chapter 8 BLAST DESIGN. 2014611enspensp4. Determine amount of ...

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mine mine bench height for blasting

mine bench height for blasting 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 . Improved Blasting and Bench Slope ...

More

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, ... holes over the full double-bench height, proved to be suitable in terms of both achievable bench slope geometry, and production concerns. For the hangingwall, a presplit blast design is used in specific areas to ensure that sufficient ramp width is achieved. The study reported here has effectively ...

More

Drill And Blast Best Practices Part One: Bench Preparation ...

13/07/2020  Written by Aron Muniz, Mining Engineer, Drill Blast Specialist, Datamine. Posted on July 13, 2020 October 29, 2020 by Terry Yang. Drill And Blast Best Practices Part One: Bench Preparation. In more than twelve years of working as a Drill and Blast Engineer, I have learnt many great practices on site, and witnessed as many equally questionable ones that I believe should not be propagated into ...

More

ASK MINING: Blasting Practices at Open Cast Mines

02/03/2012  Blast Hole Diameter: Up to bench height of 8m, 100mm,, 150mm, 163mm of blast hole diameter is preferred but for bench height > 8m, a minimum of 250mm diameter of blast hole is efficient. 4. Spacing and Burden: In coal measure rocks spacing varies from 3-8m whereas burden is selected about 0.8 times the spacing.

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Big Bench Blasting In Mining Operations

Dec 12, 2018018332The drilling cost depends on bench configuration, the performance of drilling equipment, rock characteristics and blasting pattern. Typical mining bench is illustrated in Fig. 2. In a bench blasting activity, the length, width, and height of the bench are known while designing a blast.

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Chapter 8 BLAST DESIGN - National Park Service

Use bench height plus subdrilling minus stemming. 5. From Table 4 of Blaster’s Guide, determine pounds/foot of explosive. 6. Determine total load. Multiply amount of hole to be loaded (Step #4) by the pounds per foot of explosives (Step #5). 7. Divide the total load (Step #6) by the bench height. This will equal the number of cubic yards that can be broken at 1 lb/cy. 8. Determine ...

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mine bench height for blasting

Mine Bench Height For Blasting pclconsult. Bench Blasting . Bench Blasting Basics. Bench blasting consists of drilling holes in the rock at depths, in diameters, and at spacing so that the ANFO (which is a mixture of Ammonium Nitrate[fertilizer] and Fuel Oil [diesel fuel]) as a column charge,together with a bottom . read more. Chapter 8 BLAST DESIGN. 2014611enspensp4. Determine amount of ...

More

Optimization of Blasting Parameters in opencast Mines

The spacing, bench height, burden, charge per hole as depending on the previous parameters can be calculated. From the different input and calculated parameters the total cost of the method is calculated and the least expensive method is selected as the optimized model. Blasting related information were collected from three different mines of Mahanadi Coalfields Ltd.(MCL) for implementation of ...

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Surface mining planning and design of open pit mining

09/01/2016  2 February 2016 Prof. Dr. H.Z. Harraz Presentation Mining Methods, Surface mining 23. 1.5) 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. The height will ...

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Blast design in opencast mining - SlideShare

12/10/2017  In practice, burden = ½ to 1/3 of bench height. Spacing- distance between two consecutive holes in a row parallel to face. It should be adequate. In practice, spacing = 1.0 to 1.5 of burden. 9. Blasting parameters Stemming distance – 0.7 to 1.0 of burden is adequate. To much could lead to excessive vibration and poor fragmentation. Sub-grade drilling – blast holes may not break to full ...

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Development and Application of Blast Casting Technique

By considering working processes and effect of blast casting and dragline, the basic bench parameters were determined as 80 m of mining panel width, 40 m of stripping bench height, and 75 degree of slope angle while the parameters for best blasting effect were determined as 9 m to 13 m of spacing and 7 m to 9 m of burden. Hole-by-hole initiation technique and milliseconds blasting were adopted ...

More

ASK MINING: Blasting Practices at Open Cast Mines

02/03/2012  Blast Hole Diameter: Up to bench height of 8m, 100mm,, 150mm, 163mm of blast hole diameter is preferred but for bench height > 8m, a minimum of 250mm diameter of blast hole is efficient. 4. Spacing and Burden: In coal measure rocks spacing varies from 3-8m whereas burden is selected about 0.8 times the spacing.

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Blasting and Explosives Quick Reference Guide 2010

Blast hole diameter in mm ≤ 15 x Bench height (BH) in metres Bench height (BH) in metres ≥ (Blast hole diameter (D) in mm)/15 Burden (B) = (25 to 40) x (D) Spacing (S) = 1.15 x B (This gives an equilateral pattern) Subdrill = (3 to 15) x D Charge length (C) ≥ 20 D Stemming ≥ 20 x D or (0.7 - 1.2) x B Burden stiffness ratio = BH/B : 2 to 3.5 good fragmentation : > 3.5 very good ...

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Big Bench Blasting In Mining Operations

Dec 12, 2018018332The drilling cost depends on bench configuration, the performance of drilling equipment, rock characteristics and blasting pattern. Typical mining bench is illustrated in Fig. 2. In a bench blasting activity, the length, width, and height of the bench are known while designing a blast.

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DETERMINATION OF SOME BENCH BLAST PARAMETERS USING VORONOI ...

4.3.3 Output for the blast sequence of Mine-1 55-56 4 ... Pit geometry which comprises of thickness of orebody, bench height, bench slope angle, height to width ratio etc. Explosive characteristics Characteristics of blasting accessories such as burden, spacing, ratio of burden to spacing, depth of hole, diameter of blastholes, toe and sub-grade drilling Blasting techniques which includes ...

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Optimization of Blasting Parameters in opencast Mines

The spacing, bench height, burden, charge per hole as depending on the previous parameters can be calculated. From the different input and calculated parameters the total cost of the method is calculated and the least expensive method is selected as the optimized model. Blasting related information were collected from three different mines of Mahanadi Coalfields Ltd.(MCL) for implementation of ...

More

Blast design in opencast mining - SlideShare

12/10/2017  In practice, burden = ½ to 1/3 of bench height. Spacing- distance between two consecutive holes in a row parallel to face. It should be adequate. In practice, spacing = 1.0 to 1.5 of burden. 9. Blasting parameters Stemming distance – 0.7 to 1.0 of burden is adequate. To much could lead to excessive vibration and poor fragmentation. Sub-grade drilling – blast holes may not break to full ...

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Reduction of Blast Induced Ground ... - Mining and Blasting

bench height of 7 m. A blast hole of 150 mm diameter was created at a distance of 4 m (burden) from the free face. These parameters are of those full-scale single hole blast conducted at an opencast coal mine in India (Adhikari et al., 2005). A set of vertical joints with a spacing of 20 m and horizontal joints with a spacing of 10 m was ...

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meaning of bench, berm, bench toe in mining « BINQ

Improving Double Bench Face Performance at the Ekati Diamond . 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 . for this article, the mean design bench face angle was around 80°.. not as effective as a catch fence, nor as effective as a berm at the bench crest, as falling

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The application of a blast audit for production improvement

blasting on the mining cycle, CNR desired a thor-ough review of blasting technologies to improve mining operations. The initial step for this process was to carry out a thorough audit of the blasting operation and its effect on the downstream min-ing processes. DynoConsult performed this audit at the request of the mine management at Tilden/ Empire. The audit occurred during the period of 23 ...

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Drill And Blast Best Practices Part One: Bench Preparation ...

13/07/2020  Written by Aron Muniz, Mining Engineer, Drill Blast Specialist, Datamine. Posted on July 13, 2020 October 29, 2020 by Terry Yang. Drill And Blast Best Practices Part One: Bench Preparation. In more than twelve years of working as a Drill and Blast Engineer, I have learnt many great practices on site, and witnessed as many equally questionable ones that I believe should not be propagated into ...

More

Bench Blasting - Helals

Bench blasting consists of drilling holes in the rock at depths, in diameters, ... Bench. Height. m: Kg/m: Kg: 0.19: 0.42: 2.0: 15.0: 15.20: 2.86: 2.40: 13.6: 12.0 The test blasting of one ore more rows is a good way to obtain some impression concerning the blasting charahteristics of the rock. Where it is desirable, at least in connection with production blasting, to utilize the drill holes ...

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Chapter 8 BLAST DESIGN - National Park Service

Use bench height plus subdrilling minus stemming. 5. From Table 4 of Blaster’s Guide, determine pounds/foot of explosive. 6. Determine total load. Multiply amount of hole to be loaded (Step #4) by the pounds per foot of explosives (Step #5). 7. Divide the total load (Step #6) by the bench height. This will equal the number of cubic yards that can be broken at 1 lb/cy. 8. Determine ...

More

Development and Application of Blast Casting Technique

By considering working processes and effect of blast casting and dragline, the basic bench parameters were determined as 80 m of mining panel width, 40 m of stripping bench height, and 75 degree of slope angle while the parameters for best blasting effect were determined as 9 m to 13 m of spacing and 7 m to 9 m of burden. Hole-by-hole initiation technique and milliseconds blasting were adopted ...

More

A mine is blasting with the following parameters: Burden 5 ...

1:A mine is blasting with the following parameters: Burden 5.8 m Spacing 6.4 m Stemming 2.9 m Bench height 13.0 m Sub-drill 1.2 m Hole diameter 165 mm Explosive P 700 Explosive density 1.18 g/cc Explosive RBS 157 Rock factor 7 a) Calculate the mean fragmentation size using Kuz Ram (m)

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Blast optimization at Kriel Colliery J r n a

10 m x10 m blast hole pattern and a bench height in excess of 30 metres. The blast holes are loaded with explosives to an 8 metre stemming. In Pit 6 a 8 m x 8 m blast hole pattern is drilled and the average bench height is 20 metres. The holes are loaded to a 6 metre stemming length. The major issues resulting from poor overburden blasting are: poor fragmentation, bad highwall conditions ...

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Pit Wall Angles and Bench Width – How Do They Relate?

10/05/2015  A rule of thumb is that the catch bench width should be according to the formula 4.5m + 0.2H, where H is the height of the bench. This means the recommended catch bench width for a 5m high bench should be about 5.5m; for a 10m high bench it should be 6.5m; and for 15m high bench it should be 7.5 metres.

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(PPT) MINIMIZATION OF BOULDERS DURING BLASTING

CONTROLLABLE FACTORS These are the factors which can be alternated and the following are these factors; *Bench height *Blast hole diameter *Sub-drill *Stemming(ho=1*B) *Spacing(S=1.25*B) GEOLOGY OF AN AREA The geology of an area affect blasting performance due to the hardness of the rock. The type of rock that used at Nyanza Road Quarry is ...

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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 and Mine Safety and Health Administration’s ...

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Blast design in opencast mining - SlideShare

12/10/2017  In practice, burden = ½ to 1/3 of bench height. Spacing- distance between two consecutive holes in a row parallel to face. It should be adequate. In practice, spacing = 1.0 to 1.5 of burden. 9. Blasting parameters Stemming distance – 0.7 to 1.0 of burden is adequate. To much could lead to excessive vibration and poor fragmentation. Sub-grade drilling – blast holes may not break to full ...

More