Ammonium Nitrate Fuel Oil (ANFO)—consisting of 94% porous prilled ammonium nitrate and 6% industrial fuel oil—remains a widely used blasting agent within the South American mining market due to its simplicity and cost-efficiency. In dry open-pit mines and non-reactive rock environments, ANFO offers an economical blasting solution that can be manufactured, stored, and loaded easily using standard equipment.

                       ┌──────────────────────────────┐
                       │  Legacy Blasting Base        │
                       │     (94% AN Prills + 6% FO)  │
                       └──────────────┬───────────────┘
                                      │ Modern Material Blend
                                      ▼
┌────────────────────────────────────────────────────────────────────────────┐
│                    Heavy ANFO Blend Optimization Matrix                    │
├────────────────────────────────────────────────────────────────────────────┤
│ [Porous Prill Absorption] ──> [Bulk Emulsion Blends] ──> [Water Resistance] │
│ [Pneumatic Loading Units] ──> [Custom Energy Sizing] ──> [Consistent VOD]  │
└────────────────────────────────────────────────────────────────────────────┘

Optimizing ANFO Performance Through Heavy Blends

To extend its performance into harder rock strata and slightly damp conditions, mining operators combine raw ANFO with bulk emulsions to create "Heavy ANFO" variants:

• Porous Prill Absorption Control: High-quality ammonium nitrate prills are designed to absorb fuel oil evenly, preventing oil drainage and ensuring consistent detonation velocities.

• Custom Emulsion Blend Ratios: By adjusting the ratio of emulsion to ANFO, blasters can scale water resistance and energy characteristics to match local geology.

• Pneumatic Loading Acceleration: In underground applications, pneumatic loading systems blow ANFO prills into boreholes at high velocities, packing the holes tightly to optimize rock breakage.

To review operational pricing matrices and raw material consumption trends for ANFO components, consult the South America Mining Explosives Market data center.