In narrow-vein operations, traditional “one-size-fits-all” blasting often results in excessive planned and unplanned dilution. This not only lowers ore grade but also increases processing costs. By revising the blasting pattern, mining operations can significantly tighten the mining envelope and improve overall efficiency.
Controlled blasting and buffering are key to achieving precision. Transitioning to decked charges and using lower-density explosives, such as specialized ANFO blends near the hanging wall, reduces the “shattering” effect into waste rock (Villaescusa, 2014). Re-sequencing the firing pattern to create a “relief void” toward the center of the vein minimizes lateral throw, keeping ore separated from wall rock. Additionally, reducing hole diameters allows for a higher-density pattern of smaller charges, improving energy distribution within the narrow-vein geometry.
Optimizing blast design in narrow-vein structures has measurable benefits. Studies indicate that these techniques can reduce dilution by 15–25%, increasing the mill head grade and lowering the total cost per ounce of extracted ore (Kanchibotla, 2003). By controlling energy placement, miners are able to recover more ore while reducing waste and downstream processing requirements.
In narrow-vein mining, “less is more.” Careful control over blasting energy, timing, and sequencing maximizes ore recovery while minimizing waste. Precision in blast design not only improves profitability but also enhances operational safety and sustainability, demonstrating how thoughtful engineering decisions can directly impact the bottom line.
Could smarter blasting save ore, reduce waste, and boost your bottom line?
Reference:
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Villaescusa, E. (2014). Geotechnical Design for Sublevel Stoping. CRC Press. (Focuses on controlling blast damage to minimize dilution).
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Kanchibotla, S. S. (2003). Optimum Blasting? Is it Minimum Cost per Tonne or Maximum Profit per Tonne? AusIMM.
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Dominy, S. C., et al. (2009). Narrow-vein mining: Review of geological and mining quality control issues. Applied Earth Science.
