The future of Doncaster's last remaining coal mining headstocks has been thrown into doubt.
A report examining the iconic structures at Hatfield Colliery in Stainforth has said the council will need to fork out £4 million to bring them back to its former glory.
No decision has yet been made but the move could see them demolished if no viable alternative is found.
Campaigners are trying to launch plans to turn the site into a attractive venue to hold weddings, concerts and community events.
Despite Doncaster Council not owning the land, local authority bosses have shelled out around £500,000 on security arrangements to keep thieves and trespassers off the site since it closed in 2015.
Council bosses said the headstocks were left to decay by their former owner, Hatfield Colliery Partnership Ltd.
Both of the headstocks have been granted listed status as it was 'believed they had a rare internal lattice structure.'
But council chiefs said the survey, carried out by Nottingham firm Bonsers Restoration, has 'confirmed this is not the case' and is of a more common structure.
Discussions are now taking place between the council and Historic England to discuss the report’s findings and next steps.
Peter Dale, director of regeneration and environment at Doncaster Council, said: “We understand the historical significance of the Hatfield Colliery headstocks but as a council, we have a duty to look after our residents and do the right thing to protect them.
“We have shared the specialists’ report with the local action group as well as Historic England. We are now working to come to a mutually agreeable decision on the future of the headstocks.
“Once a final decision has been made about the future of the headstocks, Mayor Ros Jones is clear that we must celebrate and recognise the town’s proud mining heritage.”