A solvent extraction settler (1) comprising a foundation (2). The solvent extraction settler (1) comprises self-supporting modules (3) each having the exterior dimensions, strength and corner fittings (4) conforming to shipping container standards. The foundation (2) comprises a plurality of pillars (5) on which the modules (3) are supported at a height above the ground level, thereby providing a space for piping and access below the settler. The pillars (5) comprise shipping standard compatible container lashing fittings (6, 7) to which the corner fittings (4) of the modules (3) can be connected.