The Neolithic mines in Spiennes, a UNESCO World Heritage Site
The network of mines at Spiennes goes back to about 5,000 BC, a little before the beginning of the present era. The chalk is primarily made up of ancient sea beds, deposits wich date back millions of years.
Spiennes is one of the most beautiful archeological sites in Europe, and its sheer size and the excellent state in wich it has been preserved make it one of the most important examples of mining sites from the Neolithic Age.
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