A. Barrón, Filomeno Cerda, Luis Koch and Rosa Landaeta owned sulfur deposits on Tacora in 1897, and sulfur processing plants were installed in 1888 and 1900 close to Tacora. Several companies mined in the region, which later were sometimes taken over by foreign corporations. A number of mines were active on Tacora volcano, with much of the mining infrastructure being present on the upper northwestern slopes of the mountain; this infrastructure includes cableways, offices, workers' camps and treatment plants both on the mountain and on its foot. The deposits were named Aguas Calientes, Ancara, Chislluma, Santa Elena and Villa Industrial, and the total sulfur ore deposits of Tacora in 1952 were estimated to be at a minimum; in 1922 Tacora was considered the most important sulfur deposit of the Andes.