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The massive use of blasting agents such as ANFO, Heavy ANFO etc., in rock breakage has brought about an important development of initiation and priming techniques. This is due to, on one hand, the relative insensitivity of these compounds and, on the other hand, a desire to obtain maximum performance from the energy released by the explosives used in the process.

The detonation process requires initiation energy so that it can develop and majntain stable conditions. The most frequent terminology used in initiation is:

Primer: High strength, sensitive explosive used to initiate the main column in the blasthole. They are cap and detonating cord sensitive, including ones of low core load.

Booster. Powerful explosive charge with no initiation accessory that has two functions:

I. Complete the initiation work of the primer in the explosive column, and

2. Create zones of high energy release along the length of the column.

In the following paragraphs present day knowledge is discussed in order to obtain maximum yield from the explosives.