Neath Port Talbot County Borough Council has said that it expects to spend more £500,000 this financial year on investigating the landslide that has affected homes in Ystalyfera.
The council has said that it has already spent £309,000 since the latest ground movement started in February this year that led to 10 properties on Cyfyng Road being evacuated.
Work on site is continuing and has been described as “intensive” by the council. Ground monitoring using drones has been undertaken along with additional borehole for ground investigation and installation of new drainage.
Earth Science Partnership has developed a new hazard map for the area based on survey results and categorises the village into lower, moderate or higher hazard areas.
The landslide, which was first recorded 120 years ago – are reported to be caused by number of factors including local geology but they are also related to high rainfall, historical coal mining and quarrying and steepness of topography which are contributing factors affecting the area.
The council has said that several independent experts have told it that there is no feasible engineering solution to the landslip issue at Ystalyfera. The authority has said that its role is to support those affected, ensure public safety and monitor for further ground movement.
Neath Port Talbot Council leader Rob Jones said: “We are putting considerable resources and money into dealing with what is a difficult problem caused by nature and other factors such as historic mining.
“The experts have told us there is no feasible engineering solution so our role is to support residents affected and ensure public safety.”