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mine bench height for blasting

ON-BENCH PRACTICES FOR OPEN CUT MINES AND QUARRIES

to ‘on-bench’ activities, including the preparation of a blast area the priming and,charging of blastholes, stemming and the tie-up of charged blastholes ready for firing. 1.2 This code does not cover the detailed requirements for the safe and secure storage

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Selection of practical bench height in open pit mining

Determination of practical bench height is an important subject in open pit mining. This subject has always been an issue with different and sometimes conflicting criteria that have to be

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Pit Wall Angles and Bench Width How Do They Relate?

May 10, 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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Blasting and Explosives Quick Reference Guide 2010

These rules provide a first estimate in the absence of any better data. 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

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Bench Height Drilling Mining Free 30-day Trial Scribd

Mine Planning Bench Blasting. TGA March. 1-s2.0-S0924013600006865-main.pdf. ICRAMID_283. Tech Drilling DrDrilling1. and benches fragmentation usually cheaper with larger holes and benches Regulations may constrain Some localities limit bench height for safety Blast

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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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Selection of practical bench height in open pit mining

Dilution versus bench height (Bozorgebrahimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as deposit-related or mine-related. The bench height is a mine-related parameter that can be studied using a simple geometrical model of

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Mining Bench Height Evaluation for the Wallaby Resource

A study on the feasibility of mining the recently discovered Wallaby gold deposit is due for completion by mid-2000. Open pit mining is the favoured method. Determination of the impact of mining bench height on the recovery of ore, including the estimation of dilution and

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Economic evaluation of optimum bench height in quarries

bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportation

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explosives Mining and Blasting

Jun 14, 2018· Bench height = 1.5 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).

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Blasting and Explosives Quick Reference Guide 2010

These rules provide a first estimate in the absence of any better data. 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

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Selection of practical bench height in open pit mining

Dilution versus bench height (Bozorgebrahimi et al., 2005). Figure 3. Large block of the simple sequencing method. In open pit mining, factors that can affect the degree of dilution can be regarded as deposit-related or mine-related. The bench height is a mine-related parameter that can be studied using a simple geometrical model of

More

Bench Height Drilling Mining Free 30-day Trial Scribd

Mine Planning Bench Blasting. TGA March. 1-s2.0-S0924013600006865-main.pdf. ICRAMID_283. Tech Drilling DrDrilling1. and benches fragmentation usually cheaper with larger holes and benches Regulations may constrain Some localities limit bench height for safety Blast

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A system-wide approach to minimize the operational cost of

Dec 12, 2018· The 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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Mining Bench Height Evaluation for the Wallaby Resource

A study on the feasibility of mining the recently discovered Wallaby gold deposit is due for completion by mid-2000. Open pit mining is the favoured method. Determination of the impact of mining bench height on the recovery of ore, including the estimation of dilution and

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Mining Surface mining Britannica

Mining Mining Surface mining: It has been estimated that more than two-thirds of the world’s yearly mineral production is extracted by surface mining. There are several types of surface mining, but the three most common are open-pit mining, strip mining, and quarrying. These differ from one another in the mine geometries created, the techniques used, and the minerals produced.

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Optimized design of drilling and blasting operations in

Nov 01, 2018· Some other researchers made attempts to optimize drilling and blasting operations from the technical point of view; Sontamino and Drebenstedt addressed a dynamic model for a bench blasting design . Bowa introduced a practical method in an open pit mine to optimize blasting design parameters such as bench height, drill hole diameter, spacing

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Economic evaluation of optimum bench height in quarries

bench height has been found to be 15 m. At the same time, the blast unit cost has been seen to diminish as the hole diameter grows. As the bench height goes up, unit cost appears to drop; however, for 20 m of bench height, because of the increase in priming, the unit cost tends to build up increase. Loading and transportation

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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

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OPEN CAST MINE PLANNING Mining and Blasting

7. The detailed study is needed for gainful use of blast casting, determining profile of muck and volume of overburden casting by blasting, which many reduce the workload of dragline and also the effect on working level of dragline. If proper designed blasting reduces the bench height, the re-handling percentage can considerably reduced.

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Rock fragmentation control in opencast blasting

Apr 01, 2016· But, all the blast design parameters cannot be changed depending on the type of strata and bench height. Hole diameters of 159 mm, 259 mm, 269 mm and 311 mm were used depending on their bench height. The bench height is related to the working capability of

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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

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Blast design in opencast mining SlideShare

Oct 12, 2017· Blasting parameters Burden- the shortest distance between two holes perpendicular to the face. It should be adequate. 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.

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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, i.e. 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.

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