Method Of Expolsion In Mines

Different Types of Explosives Used in Mining

Two different kinds of reactions (deflagration and detonation) allow distinguishing between the high and low explosives. The so-called "low-order explosives" or "low explosives," such as Black Powder, tend to generate a large number of gasses and burn at subsonic speeds. This reaction is called deflagration.

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A long hole stoping system for mining narrow platinum reefs

An explosives expert from African Explosives Limited, was present during the initial charging and blasting operations. His guidance was critical to demonstrate the method of charging a 15 m long blast hole. Detonating cord was used in conjunction with a train of cartridge emulsion explosives (Magnum 365 mm x 560 mm). (The explosives

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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

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Mine Shaft Sinking Methods - 911 Metallurgist

28/03/2017· Conventional mine shaft sinking methods involve the performance of a cycle of different operations—drilling and blasting, removal of smoke and cleaning of fly-rock lodged on overhead timbers, mucking and hoisting of the broken rock, and timbering. The latter (a) may be the last operation of the cycle, (b) may be carried on during drilling and mucking, provided it is done from a substantial

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CDC - Mining Topic - Explosion Prevention -

Explosions in underground mines and surface processing facilities are caused by accumulations of flammable gas and/or combustible dust mixed with air in the presence of an ignition source. While much progress has been made in preventing explosion disasters in coal mines, explosions still occur, sometimes producing multiple fatalities.

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Mine Explosions - an overview | ScienceDirect

Frictional ignition frequency in US coal mines is on the decline, but it still is a cause of concern because it has a potential to cause a mine explosion leading to a large-scale mine fire. Prevention of frictional ignition is based on the following: 1. Coal seam degasification to reduce original gas content of the coal seam by 50–80%.

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Methods for Controlling Explosion Risk at Coal Mine

At coal mine working faces, simultaneous application of three basic elements reduces the methane explosion hazard: (1) adequate ventilation, (2) regular monitoring of gas conc entrations, and (3) the elimination of ignition sources.

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Blasting in Underground Coal Mines - Mining Science and

enable commencement of longwall mining operations. • Drill & blast methods were used in a coal mining environment, • utilising both standard explosives and permitted explosives. The drifts were generally 250m long at 1 in 7 grade commencing from the base of a box cut 70m deep • x 30m wide x 70m long.

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Rock Blasting Breaking and Mining Methods –

Rock Blasting Breaking and Mining Methods. This safe work method statement provides the details of the materials, equipment, procedures and relevant documents related to the Rock Blasting activity, including the quality control verification, the measurement verification, and also the safety precautions to be implemented for this work.

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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

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