Stillwater Grouting Unit



Stillwater Mining Company
Stillwater Mine
Big Timber, Montana, USA

4.5 m3/hr


  • Conceptual Design
  • Struct./Mech. Engineering
  • Design & Supply Of Control System
  • Supply/Fabrication of all Equipment
  • Commissioning and Training


  • 250 Liter Colloidal Mixer
  • 500 Liter Agitation Tank
  • Piston Pump
  • MCC/PLC Control System
  • Support Skid

Two 15’ diameter hard rock tunnel boring machines were used in the Stillwater’s East Boulder project near Big Timber, Montana. As pilot drilling had indicated that water would be encountered during the tunneling, it was decided that curtain grouting ahead of the TBM would be necessary

Team Mixing Technologies custom designed and manufactured a grout mixing and pumping unit to perform this grouting task. The unit consisted of a nine cubic foot capacity high shear colloidal mixer, an 18 cubic foot capacity agitation tank and a Mocol HL double acting piston pump capable of producing pressures up to 1450 PSI.