Miners used a technique called fire-setting, where wood was burned against rock faces to expand and crack the mineral-rich stone.
The mines were extensively exploited by the Counts of Albon in the 10th century and later by the Dauphins of Viennois.
Excavations have uncovered rare medieval tools, including wooden wheelbarrows and iron picks, preserved by the cave's constant environment.
The site contains over 20 kilometers of underground galleries, though only a fraction is accessible to the public.
Silver extracted here contributed to the minting of coins during the feudal era in the Dauphiné province.
La Mine d'argent is a heritage site featuring restored 10th-century silver and lead mines located in the Fournel Valley. The facility preserves archaeological remains of industrial operations that peaked during the Middle Ages and resumed briefly in the 19th century. Visitors can explore subterranean galleries that reveal advanced medieval mining techniques, including fire-setting methods used to fracture hard rock. The site functions as both a scientific research center and a museum managed by the municipality of L'Argentière-la-Bessée. It provides historical context on how these deposits influenced the economic development of the Hautes-Alpes region. The tour path includes sections of the 'Saint-Louis' gallery and various exterior interpretive trails.
The entrance to the Saint-Louis gallery, which frames the rugged mountain landscape of the Fournel Valley.
Wear a warm sweater or light jacket, as the underground temperature remains constant and cool year-round.
Sturdy, closed-toe walking shoes with good grip are necessary for navigating uneven gallery floors.
Book guided tour spots in advance, as group sizes are strictly limited for safety and preservation.
Do not attempt to enter the galleries without a registered guide, as the site is unstable and dangerous in non-monitored sections.
Open seasonally from spring through autumn; closed during winter months due to snowfall and safety risks.
Helmets are mandatory and provided by the facility; touching the geological formations is prohibited to protect historical integrity.
