MINE ENTRIES
Abandoned mine shafts pose a significant risk to both people and property.
Treatment of Mine Shafts
It is current practice to pressure grout the contents of abandoned mine shafts.
With a drilling rig erected on a suitable safety platform, the shaft is drilled to its full depth or to any desired intermediate depth. Then a PFA and cement grout is injected; when a suitable pressure is achieved the rods are withdrawn in stages and further quantities of grout injected until the shaft contents are grouted to the surface. Usually several treatment boreholes are required.
Occasionally an empty shaft requires treatment. In this case Groundshire will carefully fill it with
granular material, which may be grouted simultaneously.
Once treated a suitable reinforced concrete cap can safely be constructed at or near rockhead.
What are mine entries?
All mines needed a means of access, these were normally walk in adits from the surface or vertical
shafts.
Mine adits are treated in much the same way as shallow mine workings and please see Mine
Workings Remediation PAGE for details.
Abandoned mine shafts pose a significant risk to both people and property.
Mine Shafts
Historically most old mine shafts were loosely filled with colliery debris or other loose material which
when wet can flow out of the shaft into associated workings at the base of the shaft.
This outflow may cause a collapse of the shaft walls and allow a crater to develop at the surface, the area of which depends upon the thickness of superficial deposits.
What is the outcome?
The outcome is that the ground we have worked on is safe and stable and is suitable to build on. It is best practice to avoid building over treated mine shafts where possible.
We future proof your land.