How to Choose the Right Drill Bit for Mining Applications

Selecting the right drill bit is crucial for achieving optimal penetration rates, bit life, and drilling costs. The wrong bit choice can double your cost per meter and reduce productivity significantly.

Button Bit vs Cross Bit

Button bits with tungsten carbide inserts are the standard choice for modern rock drilling. Cross bits are used in softer formations and for specific applications where button bits are not cost-effective.

Rock Hardness Classification

Rock hardness is typically classified using the Mohs scale or UCS (Unconfined Compressive Strength). Harder rocks require harder, more wear-resistant carbide grades and different button geometries.

Bit Diameter Selection

Bit diameter must match the drill rod system and the required hole diameter. Larger diameters require more energy and are typically used with larger, more powerful rock drills.

Flushing Hole Configuration

Proper flushing is essential for bit life and penetration rate. Ensure the flushing hole configuration matches your air or water flushing system capacity.

Bit Gauge Wear

Monitor bit gauge diameter regularly. A bit that has worn below gauge produces oversized holes and causes rod jamming. Replace bits before they reach critical wear limits.