South32 Ltd., the spin-off of mining giant BHP Billiton, holds a portfolio of base metal assets, as well as operations in alumina, aluminum, coal, nickel, manganese, silver, lead and zinc. The company is the world's biggest manganese ore producer and operator of the largest silver mine. BHP, the world's biggest miner, separated 12 assets into South32 as it seeks to focus on its most profitable iron ore, coal, copper and petroleum operations. The new company's Latin American operations will include a 14.8% interest in the Mineração Rio do Norte open-cut bauxite mine (MRN Mine), as well as a 36% interest in the Alumar alumina refinery and a 40% interest in the Alumar aluminum smelter (together with certain interests in ancillary facilities and lands), all in Brazil, in addition to a 99.94% interest in Cerro Matoso, an open-cut lateritic nickel mine and ferronickel smelter located near Montelibano in Córdoba department in northern Colombia. Based in Perth, BHP's new unit will operate in five countries.