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  • Drilling and Blasting | Technical Aspects of Mining,

    Blasting in a mine generally occurs in two phases, primary blasting and secondary blasting. Blasting Primary Blasting is the activity in which in-situ rock is broken in both development and stoping and in surface mining by drilling holes in the rock, charging them with explosives and detonating the holes in a planned sequence.

  • Blast Hole Drilling: The Basic Process | RPM Drilling

    Blast hole drilling is traditionally used wherever the mining company wants to explore the mineral composition or potential mineral yield of the area demarcated for their mining interests. Blast holes are thus a fundamental step in the exploratory mining process, and can be employed in both surface mining operations and underground mining operations to varying degrees with varying effects or,

  • (PDF) ROCK BLASTING FOR MINING - ResearchGate

    15/04/2017· Bender (1999) defined production blasting as the type of blasting that is designed to fragment a predetermined volume of rock; widely spaced holes are drilled and fired in

  • blast pattern – Mining and Blasting

    12/10/2012· Benefits of Inclined Drilling in Surface Mining: In Bench Blasting, inclined drilling extends numerous benefits. These are:,Confined holes in the blast give poor breakage with bench floor underbreaks as a result. 2. Gas venting along schistosity in the walls. Flyrock and blocks is normal, particularly in the first row. Spacing must be reduced in the first row to reduce these problems. 3,

  • Drilling and blasting - Wikipedia

    Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics, to break rock for excavation. It is practiced most often in mining, quarrying and civil engineering such as dam, tunnel or road construction. The result of rock blasting is often known as a rock cut. Drilling and blasting currently utilizes many different varieties of explosives with different compositions and performance properties. Higher velocityexplosives are used for relatively har…

  • How Can Drill & Blast Operations Make Mining More,

    Using new technology can create a better link from the drilling and blasting process to other aspects of mining. Putt points out that where safety is concerned, improvements can be made by detecting preconditioned material, highly fractured zones and underground voids in real-time. Offering further detail, he says, “We can now improve how we share knowledge with a single source of truth for,

  • Blasting Holes In Mining

    Figure 85, the rock mass would be thrown to the right during blasting. of the use of explosives is an important part of blasting operations in mining and Energy distribution becomes an important factor when wet holes are encountered, as.

  • Optimization of Blasting Parameters in opencast Mines

    Optimization of blast is dependent on a host of complex factors related to the rock, explosive, initiation, drill-hole parameters and their layout. The present work is a step in the direction of developing a suitable blast model, with simple methodologies which can be adapted by the mining industry to achieve better blasting

  • explosives – Mining and Blasting

    14/06/2018· ANFO has a wide variety of applications in dry hole blasting conditions. It is one of the most cost effective blasting agents available for use in large hole diameter mining through to small hole diameter quarrying. Pneumatically loaded, ANFO is also effective in underground development and tunneling applications. Features and benefits of ANFO are, (a) it is a dry and free flowing product,

  • Designing Blast Patterns Using Empirical Formulas

    Designing Blast Patterns Using Empirical Formulas A Comparison of Calculated Patterns With Plans Used in Quarrying Limestone and Dolomite, With Geologic Considerations By Joseph M. Pugliese Twin Cities Mining Research Center, Minneapolis, Minn . . US Department of Interior Office of Surface Mining Reclamation and Enforcement Kenneth K. Eltschlager Mining/Explosives Engineer 3 Parkway Center,

  • H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

    In normal blasting all holes do not blast at the same time. Bench blasting is normally carried out as short delay blasting. The firing pattern has to be designed so that each blasthole has free breakage. The firing sequence of a chevron pattern can radically alter the drilled burden and spacing into the blasted or effective burden (Be) 11 Figure 6: Firing pattern, multiple row blasting Figure,

  • Blasting Techniques Used in Underground and Opencast

    Long hole blasting is done in wide or bodies with strong walls so that dilution is minimal. In narrow ore bodies, on the other hand, long hole blasting is not generally economical due to the high cost of drilling. The method is also not quite applicable in irregular ore bodies because long holes would either tend to leave ore unblasted in places or to break into waste rocks. Solid Blasting: In,

  • The realities and facts of hot hole blasting in coal mines,

    “Standard coal mining practice dictates that during the charging up process, hole temperatures should be measured before any loading of explosives is attempted. All holes hotter than 80°C should be abandoned and not charged. Holes above 60°C must be cooled down by means of water or other chemicals, such as Pyrocool. If the cooling operation is successful, (less than 60°C) such holes can,

  • (PDF) Rock Blasting in Underground Mining

    holes in upper part; (c) Ring AL992-496-r12 with 5 holes in upper part; (d) Ring AL992-496-r13 with 5 holes in upper part. Z.-X. Zhang, M. Wimmer International Journal of Rock Mechanics and Mining,

  • The hole story: the benefits of drill and blast | Engineer,

    Optimised blasting. Depending on the conditions of the hole (dry or wet) or the hardness of the ground, an appropriate explosive product will be selected to place into the holes. A different product may be required for different holes, or even down the same hole if hard bands exist in the strata. Technology contained in Leica J2drill can help,

  • Drilling patterns - QueensMineDesignWiki

    Blasting holes with slight delays between them provides the better results than an instantaneous blast due to the reverberation of stress waves and the use of newly developed free faces. The optimum delay increases with burden where approximately 5ms/m is the minimum interval. Blast patterns with square patterns are simple and provide good results where spacing equals the burden. Although, in,

  • ASK MINING: Blasting Practices at Open Cast Mines

    02/03/2012· Following are some important facts related to blasting practices in open cast mines:-1. Drilling: There are two major types of drilling techniques being used Down the Hole (DTH): It is used when the blast hole diameter varies from 100mm to 380mm and the depth of blast hole is 12-15m.

  • explosives – Mining and Blasting

    ANFO has a wide variety of applications in dry hole blasting conditions. It is one of the most cost effective blasting agents available for use in large hole diameter mining through to small hole diameter quarrying. Pneumatically loaded, ANFO is also effective in underground development and tunneling applications. Features and benefits of ANFO are, (a) it is a dry and free flowing product,

  • Designing Blast Patterns Using Empirical Formulas

    Designing Blast Patterns Using Empirical Formulas A Comparison of Calculated Patterns With Plans Used in Quarrying Limestone and Dolomite, With Geologic Considerations By Joseph M. Pugliese Twin Cities Mining Research Center, Minneapolis, Minn . . US Department of Interior Office of Surface Mining Reclamation and Enforcement Kenneth K. Eltschlager Mining/Explosives Engineer 3 Parkway Center,

  • Air Decking to Increase Fragmentation in Blasting

    12/06/2018· It is used across all sectors of the mining industry, including underground horizontal hole blasting. Increased fragmentation and cast percentage is achieved with the same or reduced Powder factor. All of the above could be achieved without changing the blast design or Capital expense. The Saver Plug system for blasting operations and casting applications. The Saver Plug methodology is

  • The realities and facts of hot hole blasting in coal mines,

    “Standard coal mining practice dictates that during the charging up process, hole temperatures should be measured before any loading of explosives is attempted. All holes hotter than 80°C should be abandoned and not charged. Holes above 60°C must be cooled down by means of water or other chemicals, such as Pyrocool. If the cooling operation is successful, (less than 60°C) such holes can,

  • H BLASTING IN SURFACE EXCAVATION - Mining and Blasting

    In normal blasting all holes do not blast at the same time. Bench blasting is normally carried out as short delay blasting. The firing pattern has to be designed so that each blasthole has free breakage. The firing sequence of a chevron pattern can radically alter the drilled burden and spacing into the blasted or effective burden (Be) 11 Figure 6: Firing pattern, multiple row blasting Figure,

  • Understanding charging and blasting,- Mining

    The locations and size of these holes are carefully determined by mining engineers based on geological surveys, as well as the quantity of explosives. When detonated, these explosives cause the rock to collapse. Detonations are precisely patterned and timed to have the desired effect. Blasting mats may be used to suppress sound and dust, prevent rock fly and to help direct and contain the dust,

  • (PDF) Rock Blasting in Underground Mining

    holes in upper part; (c) Ring AL992-496-r12 with 5 holes in upper part; (d) Ring AL992-496-r13 with 5 holes in upper part. Z.-X. Zhang, M. Wimmer International Journal of Rock Mechanics and Mining,

  • The hole story: the benefits of drill and blast | Engineer,

    Optimised blasting. Depending on the conditions of the hole (dry or wet) or the hardness of the ground, an appropriate explosive product will be selected to place into the holes. A different product may be required for different holes, or even down the same hole if hard bands exist in the strata. Technology contained in Leica J2drill can help,

  • The basics about blasting. - Engineering News

    All mining operations requires blasting at one stage or another. Blast hole drilling is used in mining where a hole is drilled into the surface rock, packed with explosives and detonated. The aim,

  • Designing Blast Patterns Using Empirical Formulas

    Designing Blast Patterns Using Empirical Formulas A Comparison of Calculated Patterns With Plans Used in Quarrying Limestone and Dolomite, With Geologic Considerations By Joseph M. Pugliese Twin Cities Mining Research Center, Minneapolis, Minn . . US Department of Interior Office of Surface Mining Reclamation and Enforcement Kenneth K. Eltschlager Mining/Explosives Engineer 3 Parkway Center,

  • Bodie History: Drilling & Blasting in the Bodie Mines

    Hand drilling holes for blasting represented 75% of mining costs, calling for a device that would drill rock more cheaply. The demand led to machine drills, the second technological development that revolutionized underground mining.

  • Rock fragmentation control in opencast blasting,

    01/04/2016· In opencast mining, where blasting is employed for excavation, the overall cost effectiveness of the production operations is compatible with optimization of drilling and blasting parameters. Rock fragmentation depends upon two groups of variables: rock mass properties which cannot be controlled and drill-and-blast design parameters that can be controlled and optimized. The

  • Underground mining (hard rock) - Wikipedia

    Long-hole large-diameter holes are drilled vertically into the ore body from the top using in-the-hole (ITH) [clarification needed] drills, and then blasting horizontal slices of the ore body into an undercut. Ore blasted in retrieval taken in phase. This retrieval is done from bottom of the section developed. Last cleaning of ore is done through remote controlled LHD machines. A system of,

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