sentences:  In 1822 bauxite was discovered in the area by geologist Pierre Berthier.The ore was intensively mined until its exhaustion at the end of the 20th century.Les Baux-de-Provence is located in the foothills of the Alpilles in the "Parc Naturel Regional des Alpilles" some 22 kilometers south of Avignon and 15 kilometers north-east of Arles.