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Jan 11 2018 In some cases especially when dealing with harder types of rock explosives are the only feasible tool for the job and blast mats play an essential role in controlling Together these small explosions all occurring in sequence and with minor delays of 25 100 milliseconds will comprise the single blast

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Aug 7 2017 rate resulting in large rocks and short blasting footage Thus improving system can change the energy distribution of explosives Finally field The boreholes were drilled with the Y 26 portable rock drill Each hole was

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Aug 23 2011 Explosives are a vital part of many mining operations the ability to break up hard rock makes the task of digging and transporting it significantly easier Coal miners also use a huge amount of explosives every year for overburden removal breaking up shale and siltstone that sits on top of lucrative coal

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Explosives which are forbidden or quot Use of explosives and blasting agents quot Suitable fire control devices such as small hose or portable fire extinguishers


Tons of Rock Powder Factor lbs of Explosives The higher the powder factor the lighter the load Lower powder factor means more explosives Example 1 5 tons PF of 6 25lbs cartridged explosive products must be smaller than the borehole diameter to allow for easier loading The resulting decrease in the diameter

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Employees trained and or certified to use handle store and transport explosives must maintain their relevant endorsements licenses training and field For example using hearing protection when working with or close to portable machines chain saws rock drills portable water pumps A combination of the above

Crusher Wikipedia

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Explosives and Detonators Mining and Blasting

High VOD explosives are more suitable in hard rock and low VOD in softer rock Generally explosives with a lower VOD tend to release gas over a longer period and consequently have more heave The VOD range in commercial explosives is 25007500 m s 3 3 Density The density of a explosive determines the charge weight per meter of hole

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The traditional method of hard rock mining is a batch process with the following sequence Holes are drilled in the rock chemical explosives placed into the holes and the A small amount of viscous electrolyte 12 such as copper sulphate is injected into the hole and a coaxial blasting electrode 14 is inserted in the hole

The Oil Drum Other Methods of Breaking Rock

Aug 23 2009 In both cases there is a market for the large pieces that are produced and thus the alternate advantages of just drilling lots of holes partially filling them with explosive and then breaking the rock out into a lot of small pieces is offset by the sales price of the end product So say you wanted to mine these

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