South32 was born of the demerger of noncore assets from BHP in 2015. South32 comprises BHP's former aluminium and manganese businesses and the South African energy coal and New South Wales metallurgical coal businesses. It also owns the Cannington silver/lead/zinc mine in northwest Queensland and the Cerro Matoso nickel mine in Colombia. Cannington silver mine and manganese operations deliver high returns but have relatively short reserve life. The company acquired Arizona Mining, which brings with it the high-grade, and likely low-cost Hermosa deposit in the U.S. The South African thermal coal assets are to be disposed of.