Plans to stabilise the ancient Silbury Hill mound in Wiltshire have been unveiled by English Heritage.
The man-made monument, believed to date to the Neolithic period, developed a hole at the top five years ago after the collapse of infilling in a shaft.
There are proposals to remove an inadequate backfill from this and other cavaties and replace it with chalk.
English Heritage said it would preserve the long-term stability of the hill while minimising further damage. The organisation is also looking at how to fund the project.
Regional director Bob Bewley said: "If all goes to plan we're probably looking at some small amount of work during 2006 and then it'll probably happen in the summer of 2007.
More: BBC News
http://news.bbc.co.uk/2/hi/uk_news/england/wiltshire/4477192.stm
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