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N.C. Department of Environment and Natural Resources

NC Department of Environment and Natural Resources
Energy Mineral and Land Resources - Drilling

Energy Mineral and Land Resources

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  Crushed stone (aggregate)  
  Drilling and loading trucks  

Drilling occurs every day to provide broken rock for the primary crusher. Six-inch diameter holes are drilled to a depth of 44 feet , filled with only enough explosive to break the rock. The 'pocked' ground in front of the drill are holes ready to receive explosives. The operator closely monitors the blast vibration.
Air rotary self-propelled tracked drills bore 6-inch diameter holes to a depth of 44 feet on an actively mined bench (left).

The holes are loaded with explosives and detonated to break the rock into pieces that can be loaded on trucks for transport to the primary crusher (below).

A close-up view of a drill.

 
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