Rio Tinto will invest $758m in the modernisation and expansion of its Canadian aluminium smelters to improve production efficiency.
The investment will be spent to complete the first phase of the AP60 plant in Saguenay-Lac-Saint-Jean, Quebec, Canada.
The AP60 is the latest generation of the bespoke technology, and metal output per pot at the plant will be 40% higher than at existing smelters.
Rio Tinto will also invest an additional $300m for further construction in preparation for the $2.5bn modernisation of the Kitimat smelter in British Columbia.
The Kitimat smelter will be powered exclusively by hydroelectricity and use Rio Tinto Alcan's proprietary AP technology to reduce its emissions intensity by more than 50% a year.