Two coal seams below ground led to extensive voids - 2,540 tonnes of grout for stabilisation and volume of grout required higher than predicted.
Funding - September 2025, NECA had to add £10.9 million for completion.
The operations director described the groundworks as biggest challenge.
Two coal seams below ground led to extensive voids - 2,540 tonnes of grout for stabilisation and volume of grout required higher than predicted.
Funding - September 2025, NECA had to add £10.9 million for completion.
The operations director described the groundworks as biggest challenge.