Former ochre mine at Gargas, now an open guided-heritage attraction with some forty kilometres of surviving underground galleries.
The Mines d'ocre de Bruoux at Gargas, in the Parc Naturel Régional du Luberon, Vaucluse, are among the most significant surviving examples of underground ochre extraction anywhere in the world. Industrial exploitation of ochre at Gargas began in 1848, drawing on deposits of iron-rich kaolinite sands of Albian age. The mine was worked by hand by teams of ocriers — ochre miners — who cut the galleries using pickaxes and carbide lamps, moving the extracted sands on small wagons.
More than forty kilometres of galleries were driven beneath the plateau, reaching heights of between five and fifteen metres. Extraction declined through the mid-twentieth century as synthetic pigments displaced natural ochre, and the underground workings finally closed in the years after the Second World War. The site was rehabilitated and opened to the public as a guided heritage attraction in April 2009, managed by the SARL Arcano.
A 700-metre circuit through the galleries has been prepared for visitors. Open-air ochre extraction continues at Gargas: the Société des Ocres de France, based at Apt, operates what is described as the last active ochre quarry in Europe on the commune.
Ochre exploitation in the Luberon region has prehistoric roots, but its industrial phase was inaugurated in 1785 at Roussillon by Jean-Étienne Astier, who developed methods for washing and separating the pigment-bearing sands. Industrial extraction at Gargas commenced in 1848, making it among the earliest sites in the Luberon to enter full-scale underground production. The primary commodity was ochre — iron-bearing kaolinite sands ranging in colour from pale yellow to deep red — used principally in paints, coatings, and colourants, and also as a filler in rubber manufacture.
The workings at Bruoux were driven as underground mines rather than open-cast quarries, a technique that offered protection from weather and allowed deeper exploitation of the deposit. The ocriers cut galleries parallel and perpendicular to one another, leaving massive pillars of unexcavated material to support the roof, in a method known as chambres et piliers (rooms and pillars). Work was carried out by hand, with picks and shovels, using carbide-lamp lighting. The extracted sands were loaded into small wagons. Over the principal period of intensive working, roughly 1848 to the years immediately after the Second World War, more than forty kilometres of galleries were driven beneath the Gargas plateau, with individual gallery heights reaching between five and fifteen metres.
At the peak of ochre production in the Vaucluse in 1928, the département produced some forty thousand tonnes annually, with around ninety per cent exported. The mines at Bruoux formed part of this regional output. The subsequent introduction of synthetic pigments and petrochemical colourants from the mid-twentieth century progressively undermined demand for natural ochre, and the underground workings at Bruoux closed in the years following the Second World War — the precise final closure date is given in the sources as the 1950s–1960s.
After closure, the galleries remained largely intact. In the 1990s, the Société des Ocres de France resumed ochre extraction at Gargas on an open-cast basis, operating what is described as the last active ochre quarry in Europe. The underground site at Bruoux was subsequently rehabilitated with the assistance of the municipality and the European Community. A 700-metre guided circuit was opened in April 2009, managed by the SARL Arcano. The visitor route passes through galleries up to twelve metres in height; temperature inside the workings remains at approximately ten to twelve degrees Celsius throughout the year. An outdoor area with a garden, walking paths, and a small open-air theatre occupying the former cutting face has been laid out around the mine entrance. Approximately 33,000 visitors attend annually. The Musée de l'aventure industrielle at Apt holds documentary material relating to the mine's history. The broader Gargas territory, the only place described in sources as preserving the full history of ochre exploitation from 1848 to the present, is also engaged in a process of seeking the Grand Site de France designation.