Monsoon turns dry blasting into a wet-hole problem: water-filled boreholes, degraded ANFO, misfire risk, and unstable benches. Planning ahead keeps production moving safely.
Explosive selection
ANFO is water-sensitive — in wet holes it desensitises and misfires. Switch to water-resistant emulsion or heavy ANFO for wet conditions, and use waterproof detonators with protected lead-ins.
Dewatering
Pump or bail holes before charging where practical. Where water inflow is continuous, charge with emulsion and keep the column dry with proper stemming.
Stemming in wet conditions
Use crushed stone stemming and ensure it is dry. Wet stemming compacts poorly and increases air overpressure and flyrock risk.
Bench stability
Rain saturates benches and weakens crests. Inspect for tension cracks and slumping before drilling, and reduce bench heights where ground conditions demand it.
Misfire management
Wet conditions raise misfire probability. Follow the DGMS misfire procedure strictly — no re-entry until the waiting period elapses, and mark misfired holes clearly.
Monsoon is not a reason to stop blasting — it is a reason to design differently. Our blast engineers plan wet-season designs that keep PPV, flyrock, and misfires under control.