secondary blasting of rocks

secondary blasting of rocks

  • Influence of blasting on the size distribution and DiVA portal

    Dec 9, 2003 rock properties, blasting pattern, charging etc influence the fragmentation in the muckpile. secondary crushing can sometimes be just as large. .. Energy cost. SEK/ton. Relative cost. Explosives large. 400. 0,235. 0,87. 5,8. Primary crushing. 400. 100. 4. 0,230. 0,16. 1,1. Secondary crushing. 100. 20. 5.

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  • Terrock Golden Pike Flyrock Modelling Report

    depends on rock type and structure, burden, stemming height, fragmentation requirements, and safety and environmental constraints. The possibilities for excessive flyrock throw from secondary blasting are greater in circumstances where the positioning of blastholes and the accuracy of loading procedures are made more 

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  • No Secondary Blasting Fractum

    No Secondary Blasting. Fractum's rock breakers have the reputation of being effective, efficient, and precise. Our high capacity solutions have an impact power ranging from 80,000 J to 300,000 J. This allows for the fragmentation of the hardest rock material in just a few strokes, eliminating the need for secondary blasting.

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  • Rock Boulder Exploding Techniques 911 Metallurgist

    Jul 26, 2017 Several products have come on the market in recent years that improve the safety of secondary blasting operations. The most significant of these are binary explosives, exploding bridgewire electric blasting caps, and nonelectric systems.

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  • Blasting and rock fragmentation SlideShare

    Jul 21, 2017 Processes involved in primary blasting of rock in bench blasting. 1. Face survey estimating overburden 2. Drilling the shot holes preparing charge hole 3. Charging with explosive and stemming top 4. Detonating the explosive 5. Shot pile ready for loading 10. Secondary blasting Blasting conducted to 

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  • Blasting and rock fragmentation SlideShare

    Jul 21, 2017 Processes involved in primary blasting of rock in bench blasting. 1. Face survey estimating overburden 2. Drilling the shot holes preparing charge hole 3. Charging with explosive and stemming top 4. Detonating the explosive 5. Shot pile ready for loading 10. Secondary blasting Blasting conducted to 

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  • boulder prediction in rock blasting using artificial ARPN Journals

    Table2. Blast practice details. Name of the quarry. Dia. (mm). Spacing. (m). Burden. (m). Depth. (m). Explosive type. Primer. Initiation method. Secondary breakage method. Baikunth. 115 5.06.0 3.04.0. 8.0. ANFO. Cartridge booster/Cast booster. Cord relays. Secondary blasting/. Rock breaker. 152 6.57.0 4.55.0. SME.

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  • Chapter 9 GENERAL ROCK REMOVAL National Park Service

    plosives under the rock. SEAM BLASTING is used when the blaster is lucky enough to find a crack or seam, and load the explosive charge into it. The method selected will depend upon a number of factors, including the equipment at hand and the depth of the rock in the earth. Secondary blasting is noisy and generally 

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  • BLASTING DESIGN FOR OBTAINING DESIRED FRAGMENTATION

    BLASTING DESIGN FOR OBTAINING DESIRED FRAGMENTATION. Stjepan Strelec, Mario Gazdek, Josip Mesec. Predictions and analyses of blasted rock mass fragmentation have increased in importance, as primary fragmentation can significantly decrease the cost of crushing and secondary breaking, on condition that 

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  • Engineering Geology Field Manual Bureau of Reclamation

    place. Where the fragmentation is unacceptable, the best solution is to use smaller blast holes with smaller blast pattern dimensions. This extra drilling and blasting expense will be more than justified by the savings in loading, hauling, and crushing costs and the savings in secondary blasting. Where possible, the perimeter 

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  • Blasting: The types of blasting services Blast Quest

    Blasting rock in such a tunnel requires special drilling and blasting patterns in order not to disrupt the infrastructure overhead. BlastQuest as a blasting company has experienced tunnelers which will deliver a safe and precise blast. CIVIL BLASTING – ROCK BREAKING / SPLITTING / SECONDARY BLASTING / BOULDER 

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  • Blasting fragmentation management: an innovative approach using

    Secondary blasting should be avoided as much as possible, as it decreases the productivity by moving equipment and people to a safe place. This situation can be interpreted as "rework" which generally means high costs for a low production. McKenzie (1967) showed how increasing rock fragmentation decreases loading, 

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  • Secondary Blasting Standard Operating Procedure SlideShare

    Mar 1, 2015 There are two methods of secondary blasting namely Popping and Plaster or Mud Blasting. Both of these methods can generate significant nuisance from airblast (noise) and flyrock. Popping uses fewer explosives than plaster but it involves considerable drilling expense. Sometimes use of mechanical rock 

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  • Secondary blasting Article about secondary blasting by The Free

    In secondary blasting, explosive denotation release a huge amount of energy which results to rock shattering and stering and consequently high fly rocks. The rock drilling and explosive detonation generate noise in secondary blasting. The hydraulic drop ball technique breaks boulders with energy lower in magnitude 

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  • Underground Drilling and Blasting Training YouTube

    Nov 26, 2013 The Australian Centre for Geomechanics (ACG) has developed this safety training DVD for underground metalliferous mine workers. Overview All underground mine

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  • Rock Boulder Exploding Techniques 911 Metallurgist

    Jul 26, 2017 Several products have come on the market in recent years that improve the safety of secondary blasting operations. The most significant of these are binary explosives, exploding bridgewire electric blasting caps, and nonelectric systems.

    >>Details
  • A MODEL STUDY TO MEASURE FRAGMENTATION BY BLASTING

    Jul 27, 2016 Abstract: Accurate measurement of blast fragmentation is important in mining and quarrying operations, to monitor blasting and optimize blast design. A new digital photoanalytical method to measure the size of fragments by using FragScan system is presented here. Photographs of the broken rock are 

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  • Rock Blasting and Overbreak Control Federal Highway

    US. Department of Transportation. Federal Highway. Administration. NHI Course No. 132 1 1. Publiion No. FHWAHI92001. Prepared in 1991. Rock Blasting and. Control. Overbreak. National Highway Institute. Archived 

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  • Secondary Blasting Standard Operating Procedure SlideShare

    Mar 1, 2015 There are two methods of secondary blasting namely Popping and Plaster or Mud Blasting. Both of these methods can generate significant nuisance from airblast (noise) and flyrock. Popping uses fewer explosives than plaster but it involves considerable drilling expense. Sometimes use of mechanical rock 

    >>Details
  • h_blasting in surface excavation Mining and Blasting

    1. BLASTING IN SURFACE EXCAVATION. Any blast optimisation programme calls for a clear understanding of the effects of principal blast parameters and their careful appliion. The degree of fragmentation of rock depends on: a. the rock's characteristics b. the properties and quantities of explosives c. blast geometry.

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  • Drilling and Blasting of Rocks E. Lopez Jimeno, C. Lopez Jimino

    The Geomining Technological Institute of Spain (ITCE), aware of this progress and of the importance which the breakage process has acquired in mining and civil engineering projects, has ordered the publiion of Drilling and Blasting of Rocks. The purpose of this Handbook is to give basic knowledge of the drilling 

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  • ROCK BLASTING FOR MINING (PDF Download Available)

    Apr 16, 2017 To simplify the work, rock blasting is the easiest way. In mining operations, blasting has become a routine work. With proper understanding of the rocks and blasting methods, the mining work can be done effectively. The basic objective of this report is to highlight the principles and practices adopted in rock 

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  • Explosives and Blasting Procedures Manual OSMRE

    Explosives and Blasting Procedures. Manual. By Richard A. Dick, Larry R. Fletcher, and Dennis V. D'Andrea. US Department of Interior. Office of Surface Mining. Reclamation and Enforcement. Kenneth K. Eltschlager. Mining/Blasting Engineer. 3 Parkway Center. Pittsburgh, PA 15220. UNITED STATES DEPARTMENT OF 

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  • h_blasting in surface excavation Mining and Blasting

    1. BLASTING IN SURFACE EXCAVATION. Any blast optimisation programme calls for a clear understanding of the effects of principal blast parameters and their careful appliion. The degree of fragmentation of rock depends on: a. the rock's characteristics b. the properties and quantities of explosives c. blast geometry.

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  • Prediction of Rock Fragmentation in Open Pit Mines, using Neural

    Drilling and blasting costs constitute up to 30% of the total operational costs in open pit mines, which will be increased up to 50% by adding more oversize parts and the requirement of secondary blasting. Hence, the specifiion of rock fragmentation after blasting such as shape and size is by far one of the most important 

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  • Environmental Impacts of Rock Blasting and Their Mitigation ISAET

    Key words Fly Rock, Ground Vibrations, Noise, Rock blasting rock blasting. A review of the environmental impacts of rock blasting in opencast mines indies that the fumes and the dust do not pose a significant danger to the people who are in the vicinity . secondary blasting, the release of explosive energy from.

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  • Mine Blasting & Explosives Technology, and Safety Regulations

    "Irrespective of the method of primary blasting employed, it may be necessary to reblast a proportion of the rock on the quarry floor so as to reduce it to a size suitable for handling by the excavators and crushers available. Two methods of secondary blasting of rock are available. The first 

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  • Secondary breaking strategy for block 4 at De Beers SAIMM

    Concussion blasting, where concussion bombs and layon charges are used to break hangups and boulders. ➤ Drill and blast methods, where holes are drilled in large rocks and charged manually with explosives. ➤ Emulsion secondary blasting, which is a new project in use at. Koffiefontein mine from African Explosives 

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