Great Falls, Montana


  • 3″ R Prospector Hammer System on a Vermeer D36x50
  • 200 psi (13 bar) x 650 cfm air compressor

Job Description:

  • Mixed – solid rock and cobble

The bore was 300-ft (91 m) in length. The first 100-ft (30 m) was all cobble. The next 200-ft (60 m) was solid. It only took 10 hours to complete the 300-ft bore.

Great Falls job