Blast Pattern Design Calculator

Calculate burden, spacing, hole depth, and powder factor for bench blasting operations.

Hole Diameter

Bench Height

Rock Density

lb/ft³

Rock Type

Tab to move between fields

Burden

13.5 ft

Spacing16.3 ft

Hole Depth44.1 ft

Subdrill4.1 ft

Stemming9.5 ft

Charge Length34.6 ft

Tons per Hole726 t

Powder Factor0 lb/t

Explosive (lbs)496.79

How to Use This Calculator

Enter hole diameter (mm) from your drill specifications.
Set bench height (m) and rock density (t/m³) for your ore body.
Select rock type: Soft, Medium, or Hard Rock — affects burden factor and spacing ratio.
Review Burden (m), Spacing (m), and Stemming (m) for the blast pattern layout.
Use Explosive charge per hole (kg) and Powder factor (kg/t) for explosive purchasing and regulatory reporting.

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