Case as you drill – For drill holes in difficult gravel/boulder alluviums, the casing is advanced with the drill string, in addition providing continuous uncontaminated bagged samples, on reaching target depth and with the drill hole already cased to bottom, provides integrity installations of monitor well or bore hole instrumentation

With the Concentrix Overburden System, Brown Bros Drilling can obtain high quality Reverse Circulation type samples in difficult to drill mineral rich gravels, boulders and alluviums.

The system works similar to Reverse Circulation with the same benefits. Also you can drill through difficult through difficult geology, then switch to either Reverse Circulation or Wire-Line Core.

  • From vertical to 45 degree angle holes
  • Drill into and through difficult geology
  • The same benefits as Reverse Circulation and Air Core