Secondary blasting

If the outer covers of safety fuse are pierced, e.g. by falling rock, water can penetrate and stop the combustion of the fuse. Much work has been done in efforts to obtain a waterproof fuse which will obviate this difficulty. This work, although not successful in its original purpose, has led to the development of igniter cord which has proved of considerable value in secondary blasting (see p. 148). Two types of igniter cord are manufactured, fast cord with a burning speed of 3 s m1 and slow cord with a speed of 30 s m-1. [Pg.130]

Secondary blasting. A process of breaking, with explosives, boulders from an initial blast which are too large for immediate handling. [Pg.200]

Fig 4 External Charge of the ZKP Type (weighing up to 400 grams) with a spherical shaped recess for secondary blasting (from Ref 112)... [Pg.220]

Tovex C is designed for chute blasting or secondary blasting. It is packed in a moldable package and conforms well to the shape of the rock to be blasted... [Pg.824]

SE = slurry explosive (USA) 289 secondary blasting 279 secondary explosives 279 Securit -i- Wetter-securit = permitted explosive (german) 370... [Pg.42]

Tetryl (trinitrophenylnitramine) for booster charges and secondary blasting cap charges ... [Pg.187]

A blast that loosens the rock of ore from its original or natural location in the ground. A secondary blast may be used to reduce the rocks from the primary blast to smaller size for ease of handling. [Pg.327]

External Charge of the ZKP Type with a Spherical Shaped Recess for Secondary Blasting. R 196... [Pg.12]

Secondary breaking is required when boulders are produced which are too large to load or to feed into the crushing plant, and when toes are left by primary blasting. Over-sized boulders are broken by three techniques — hydraulic hammers, drop-balls and secondary blasting. [Pg.33]

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