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powder factor li ne mines

However in underground mining operations the preference is to define powder factor as the weight of explosive required per unit of weight of rock to fragment either a metric tonne or an imperial pound of solid material Thus the units become lbton for imperial and kgtonne for metric

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    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 11 may work for a bench that has a height 275 times the burden but benches with a height less than this may require a higher powder factor to blast

  • recomended powder factor mining
    recomended powder factor mining

    assessment of powder factor in surface bench blasting using Tech Student Department of Mining Engineering Indian School of Mines Dhanbad826004 reliable to enable the determination of optimum powder factor for surface bench Test Procedure 2 Hucka 10 recommended that the peak More details » Get Price

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    Powder factor 05kg per square metre of face Do not stem holes Fire all holes on the same delay or in groups of ≥ 5 holes Smooth Blasting Spacing 15 x Hole diameter hard rock 20 x Hole diameter soft rock Burden 125 x Spacing Fire as many holes as possible on one delay Stem holes Powder factors Typical powder factors

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    Sep 13 2010 · Powder Factor is the relationship of Explosives to Volume It describes how much explosives are needed to blast a particular volume of rock The easy formula is PF lbs of explosives used yd3 of rock blasted It is just an indicator so you can use whatever units of measure are common in your application

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    Powder factor 05kg per square metre of face Do not stem holes Fire all holes on the same delay or in groups of ≥ 5 holes Smooth Blasting Spacing 15 x Hole diameter hard rock 20 x Hole diameter soft rock Burden 125 x Spacing Fire as many holes as possible on one delay Stem holes Powder factors Typical powder factors

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    recomended powder factor mining

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    PAPER OPEN ACCESS Related content Effect of

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    Mine A Face 1 Mine A Face 2 Mine A Face 3 Mine A Face 4 Mine B Face 1 Mine B Face 2 Mine C Face 1 Mine D Face 1 Mine D Face 2 Mine D Face 3 Xp 50 cm 418 198 320 203 254 435 487 515 596 735 powder factor are different at different test sites Here it is assumed that the crack condition of rock mass has an

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    Apr 17 2019 · Powder factor is the amount of explosive pounds to the total amount of rock blasted tons to develop a scale which some use to develop a blast design This system is called a powder factor design approach and it is an extremely poor approach to designing a blast

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    Schneider 1997 emphasized the role of excessive powder factor insufficient burden inaccurate timing ineffective stemming and overloading a blasthole in flyrock control An injury due to flyrock is sustained when it travels beyond the blast area and injures someone

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