The Taquari-Vassouras mine is located near Aracaju (Sergipe state) in north-east part of Brazil. The stratigraphic column of the Taquari-Vassouras sub-basin consists, from the base up to the top, of sediments of age varying from the lower Cretaceous (Aptian) to the Terciary, that overlie discordantly the crystalline basement. The potash deposit is found at a depth of 450–500 m in the Ibura Evaporites which consist, from the bottom up, of limestones, anhydrites, halites, carnalites, tachydrites, with interspersed shales, halites with seams of silvinite, calcilutites (clayey fine-grain limestones) and shales. There are two main potash zones, the Upper Basal Silvinite and the Lower Basal Silvinite.

The potash deposit is in the Taquari-Vassouras sub-basin and the Taquari-Vassouras Industrial Complex is in Rosário do Catete. It can be reached by road and is also served by rail about 9km from the site and a port facility about 40 km from the mine site. The underground mining operations comprises three municipalities: Rosário do Catete, Capela and Carmópolis.

The ore is sylvinite (KCL, NaCL) containing sylvite (KCl) and halite (NaCl). It is mined at a depth of 500 to 740 meters by room and pillar methods using six continuous miners. Room and pillar is a mining system in which the mined material is extracted across a horizontal plane, creating horizontal arrays of rooms and pillars. The ore is extracted in two phases. In the first, "pillars" of untouched material are left to support the roof overburden, and open areas or "rooms" are extracted underground; the pillars are then partially extracted in the same manner.

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