Blasting and Explosives Quick Reference Guide 2010 - Dyno Nobel
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