Hi Graeme, I apologize for taking so long to respond; it is a credit to the smoothness of this project that I was able to shift my focus onto other ones. When asked by a colleague how this project went, I responded “that so last week” J. Seriously though, I want to sincerely thank you and your crew for their great efforts and patience getting this going and completed safely and successfully. A senior manager reviewing the photos also noted how tidy and well organized the site looked. Thanks also for accommodating all our site visits and heli close-ups.
A variation of karst sinkhole grouting is the grouting of mined coal seams and workings located below existing infrastructure that exhibit the potential to propagate to the surface and cause sinkholes and/or subsidence.