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Origin and history

Colorado Provençal is a remarkable geological and industrial site, born from the exploitation of ochre from the late 17th century until 1992. Located in Rustrel, in the department of Vaucluse, it extends over 30 hectares and owes its name to its landscapes reminiscent of American canyons, with cliffs, fairy chimneys and canyons carved in ochreous sands with various shades (red, yellow, orange, purple). These formations result from the lateritic alteration of glaucony-rich marine sediments, a ferroginous clay deposited 110 million years ago during the Aptian.

The exploitation of ochre began thanks to Jean-Étienne Astier, a Roussillonnais who developed, at the end of the seventeenth century, a decantation technique to extract dye pigments from the sand. The arrival of the railway at Apt in 1877 accelerated the intensive operation, particularly under the impetus of the Société des Ocres de France (created in 1901), which allowed for a massive export. Production peaked in 1929, before declining in the face of competition from synthetic dyes. The activity finally ceased in 1992 with the retirement of the last ocrier.

The site consists of several emblematic areas, such as the circus of Barries, the Sahara (an expanse of ochre sand), or the settling basins, remains of the old quarries. After the closure of the farm, a local association, created in 2009 in partnership with the town hall of Rustrel, valued the site for tourist purposes. Today, marked trails, such as GR 6, make it possible to traverse this fragile geological heritage, protected by conservation measures (barriers, monitoring agents) to limit erosion due to visitors.

The geology of Colorado Provençal is based on marine deposits of the Cretaceous, transformed by iron oxidation into goethite and hematite, responsible for the 24 official shades identified. These ochreous layers contrast with the surrounding white sands, rich in kaolinite, and the green limestones of the Luberon. The site, compared to the arid landscapes of the United States, attracts for its changing colours and industrial history, now preserved as a Grand Site of France.

The tourist infrastructure includes a fee-paying car park (provides access to the site), picnic areas, and dining points such as La Rinsoulette or Le Pego. Brochures and visitor guides complete the reception, while municipal orders prohibit access to hazardous areas, such as fairies' chimneys. Colorado Provençal remains the largest of the region's three major ochre sites, with Roussillon and Gargas, the only remaining one.

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