[1] In 1986, Cyprus acquired the Sierrita copper and molybdenum mine near Tucson, Arizona.

In July 1988, Cyprus Minerals bought the Inspiration mine and smelting complex in Miami, Arizona.

[2] With the expiry of an agreement to purchase electricity at a favorable rate from the Salt River Project, Cyprus Minerals installed an ISASMELT furnace in its copper smelter.

[3] This was the first large-scale installation of the ISASMELT process, which was developed jointly by Mount Isa Mines Limited and the Australian government's Commonwealth Scientific and Industrial Research Organisation ("CSIRO").

In late 1999, Cyprus Amax Minerals was acquired by Phelps Dodge Corporation, which in turn was acquired by Freeport-McMoRan (NYSE: FCX) in 2007, forming the world's largest copper producer.