Lead mining mounds 'under threat'

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Mounds of stone built up during ancient lead mining operations in the Yorkshire Dales are under threat, a study shows.

The 200-year-old spoil heaps are themselves being mined for aggregate to upgrade tracks, the Yorkshire Dales National Park Authority said.

http://news.bbc.co.uk/1/hi/england/york_and_north_yorkshire/10361184.stm