In 1981 Freeport Minerals merged with McMoRan Oil & Gas with each entity becoming a subsidiary of the newly formed Freeport-McMoRan Inc . In 1998 , McMoRan Exploration Co . formed with the merger of McMoRan Oil and Gas Company and Freeport-McMoRan Sulphur Co ., Inc . – officially creating Freeport-McMoRan Copper and Gold Inc . Since then , the company has become a juggernaut for gas and oil , agricultural minerals , sulphur , phosphoric acid , gold , copper , silver and uranium . In 2014 , the company changed its name to Freeport-McMoRan Inc .

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