How Neolithic miners in Belgium built an underground industrial complex 6,000 years ago

Countries & Cities · Published 29 September 2026 Swipe more like this →

In short: Deep beneath the Belgian village of Spiennes lies a vast, ancient network of flint mines. Active for over two millennia, this site reveals the sophisticated transition from surface digging to complex underground extraction, showcasing the ingenuity of Neolithic settlers who traded their stone tools across hundreds of kilometers.

The Neolithic flint mines of Spiennes, located near Mons, Belgium, represent a seminal achievement in prehistoric engineering. Active between 4,300 and 2,200 BC, the site covers approximately 100 hectares. Neolithic miners demonstrated remarkable technical diversity, evolving from simple opencast extraction to sinking vertical shafts reaching depths of over 10 meters. These shafts provided access to an elaborate, man-made network of underground caverns where workers sought high-quality flint nodules.

Extraction was a labor-intensive process, utilizing flint picks to harvest slabs that could weigh hundreds of kilograms. Once brought to the surface, these nodules were knapped into rough-out axe shapes and subsequently polished. This polishing process was critical; it not only strengthened the tool but also reduced friction, making the axes highly effective for forest clearance and shaping timber for structures like huts and canoes. The scale of this operation was significant, with rough-outs traded over distances of about 150 kilometers.

The site was first discovered in 1843, with formal excavations beginning in 1867 under the direction of mining engineer Alphonse Briart. In 2000, UNESCO recognized the site as a World Heritage location for its role in documenting the evolution of human technological application. Today, visitors can explore the history of these mines through the SILEX'S interpretative centre, which opened in 2015, and occasionally descend into the ancient shafts themselves to witness the scale of this prehistoric industry firsthand.

Spiennes is frequently compared to other major European flint sources, such as Grimes Graves in the United Kingdom and Krzemionki in Poland. While these sites share similarities in their extraction methods, they highlight a broader European trend of specialized stone tool production. Unlike the flint industries, other regions, such as the Langdale axe industry in Britain, relied on different geological materials like igneous or metamorphic rock, illustrating the varied strategies prehistoric societies employed to meet their technological needs.

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