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mine bench height for blasting
Bench Blasting
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 charge, can fracture the rock in a controlled manner.
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Blast design in opencast mining
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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Surface Mining Test 2 Flashcards | Quizlet
- reduced bench height require more time for bench prep, drill and blasting - greater bench height prorates subdrilling and explosives over a greater tonnage ... mining of smaller blocks/face height is needed. Open Pit - Bench Height - Ore Excavation - ore must be processed - blasting .
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Surface mining planning and design of open pit mining
Jan 09, 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.
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International Journal of Science &Technology, Reference ...
D=blast hole diameter (mm), W=standard deviation of the drilling accuracy (m), L=total charge length (m), H=Bench height (m).Cunningham (1987) notes that the uniformity coefficient n usually varies between 0.8 and 1.5 1.3 Bench Blasting Parameters Bench blasting in open pit operations are classified according to their purpose.
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blast pattern – Mining and Blasting
Oct 12, 2012· 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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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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big bench blasting in mining operations
big bench blasting in mining operations. 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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(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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A Comparative Study of Ground and Underground Vibrations ...
Ground vibrations originating from bench blasting may cause damage to slopes, structures, and underground workings in close proximity to an operating open-pit mine. It is important to monitor and predict ground vibration levels induced by blasting and to take measures to reduce their hazardous effects. The aims of this paper are to determine the weaker protection objects by comparatively ...
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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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Bench Blasting
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 charge, can fracture the rock in a controlled manner.
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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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Chapter 8 BLAST DESIGN - National Park Service
4. Determine amount of hole to be loaded. 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.
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DETERMINATION OF SOME BENCH BLAST PARAMETERS .
blast area patch-1 Mine-2 22-23 4 Co-ordinates for the blastholes of patch-2 Mine-2 23-26 5 Boundary co-ordinates of top blast ... bench height, bench slope angle, height to width ratio etc. Explosive characteristics Characteristics of blasting accessories such .
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Blasting sequence at Goldcorp's Penasquito mine in ...
Aug 28, 2014· MineSight at Goldcorp's Penasquito mine, Zacatecas, Mexico A blasting sequence at Goldcorp's Penasquito silver-gold mine, where MineSight is integral to mine...
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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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Evaluating the effectiveness of powder factor - Pit & Quarry
Jun 12, 2019· In fact, this will only hold for a specific bench height and, at all other bench heights, it will be incorrect leading to the formation of boulders and fines. This is because a powder factor of 1.1 may work for a bench that has a height 2.75 times the burden, but benches with a height less than this may require a higher powder factor to blast.
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11th International Symposium on Rock Fragmentation by ...
the bench height to 10m (Figure 4). STAGE 1: BLASTING TRIALS WITH 5M AND 10M BENCHES Blasting trials were conducted over two weeks starting mid- October 2013. The location of the trial blasts and their designs areshown in Figure 5. The trial blasts with 5m and 10m benches were located side by side to minimise any geological variations.
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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.
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ASK MINING: Blasting Practices at Open Cast Mines
Mar 02, 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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BLASTEC - Orica Mining Services
1.7 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 0.76 m.
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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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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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Assessing slope performance
slope design. Bench performance assessments should compliment bench mapping exercises and capture data on the as-built geometry of the benches, the geomechanical characteristics of the rock mass, the impact of blasting and excavation, the degree and type of structural control, bench-scale failures, and the general behaviour of the bench.
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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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Blaster's Training Modules - Module 4 - Blasthole Drilling
Bench Height feet 3 3.5 4 4.5 5 5.5 6 6.25 6.5 6.75 7 7.88 9 9.88 10.6 12.3 13 15 16 3 7 10 13 16 20 23 26 30 33 36 39 43 46 49 52 56 59 62 66 69 72 75 79 82 Hole Diameter in Inches A common method for calculating this relationship is: d (inches) < H/5 (in feet). Thus, for example, the maximum recommended drill-hole diameter for a mine that ...
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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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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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