Understanding underground mining: From blast hole drilling to long hole rises
Underground mining is a cornerstone of resource extraction, enabling access to valuable minerals deep beneath the earth’s surface. This process involves specialised drilling techniques that ensure efficiency, safety, and precision. Two critical methods in underground mining are blast hole drilling and long hole rises, which play essential roles in ore extraction and mine development. In this blog, we’ll break down these techniques and their importance in modern mining operations.
Blast hole drilling: The foundation of ore extraction
Blast hole drilling involves creating a series of holes in the ore body, which are then loaded with explosives for controlled blasting. This technique is essential for fragmenting rock and creating access for ore removal.
Key benefits of blast hole drilling:
- Precision blasting: Optimises fragmentation for easier mucking and hauling.
- Efficiency: Reduces dilution and improves ore recovery.
- Versatility: Suitable for sub-level caving and stopping methods.
Accuracy in blast hole drilling is critical. Deviations can lead to uneven fragmentation, increased costs, and safety hazards. Advanced drilling systems, such as water-powered hammers, help maintain straight trajectories and consistent hole depth.
Long hole rises: Creating vertical access
Long hole rises are vertical or inclined openings drilled between levels in an underground mine. They serve as ventilation shafts, ore passes, or access routes for equipment and personnel.
Advantages of long hole rises:
- Improved ventilation: Enhances airflow and safety underground.
- Efficient ore transfer: Facilitates movement between levels.
- Reduced development time: Faster than conventional raise boring methods.
Drilling long hole rises requires equipment capable of maintaining straight trajectories over significant depths – often hundreds of meters. Precision is key to avoid alignment issues that can disrupt operations.
The role of water-powered drilling
Both blast hole drilling and long hole rises demand accuracy and reliability. Water-powered drilling systems, like those offered by Wassara, deliver straight, deep holes with minimal environmental impact. Unlike air-powered systems, water-powered hammers reduce dust, noise, and energy consumption, making them ideal for sustainable mining operations.
At Wassara, we specialise in water-powered drilling solutions for underground mining. Our technology supports blast hole drilling and long hole rise development with unmatched precision and environmental responsibility. Learn more at wassara.com and connect with us on LinkedIn for updates and technical insights.
