Calculators

Two small calculators with the formulas the program uses. They are estimates, not a blast design: in Crosscut the zones are worked out and drawn on the model from your actual holes.

Flyrock distance

McKenzie’s model (ISEE 2009), as in the program

Hole diameter, mmStemming, mCharge length, mExplosive density, t/m³

Scaled depth of burial, m/kg⅓—

Longest throw = danger zone for equipment, m—

Danger zone for people, m (2×)—

Powder factor

Explosive per cubic metre of rock

Hole diameter, mmHole length, mStemming, mExplosive density, t/m³Burden, mSpacing, mBench height, m

Explosive per hole, kg—

Rock per hole, m³—

Powder factor, kg/m³—

The charge is the hole length minus the stemming.