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Blasting and Explosives Quick Reference Guide 2010 - Dyno Nobel

Blasting and Explosives Quick Reference Guide 2010 - Dyno Nobel

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Underground blast design<br />

Design of lifter & easer holes<br />

When the cut holes have been calculated, the rest of the development round may<br />

be calculated.<br />

The round is divided into:<br />

• lifter holes<br />

• side holes<br />

• back holes<br />

• easer holes with breakage upwards <strong>and</strong> horizontally<br />

• easer holes with breakage downwards<br />

To calculate burdens (B) <strong>and</strong> charges for the different parts of the round the following<br />

graph may be used as a basis.<br />

Burden, m<br />

1.2<br />

1.1<br />

1<br />

0.9<br />

Blasthole<br />

diameter, mm<br />

Pipe charge<br />

diameter, mm<br />

Blasthole<br />

diameter, mm<br />

0.8 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6<br />

Charge concentration, kg/m<br />

30 35 38 41 45 48 51<br />

30<br />

Powermite ® Pro in film cartridges. Typical density = 1.20g/cm 3<br />

Continuous lifter charge<br />

38 41 45 48 51<br />

ANFO, pneumatically charged<br />

51

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