The Copper Cliff Smelter is a facility located in Copper Cliff, Ontario, Canada, primarily used for processing nickel and copper ores. It is part of the Vale mining company and plays a crucial role in the extraction and refining of these metals, which are essential for various industrial applications. Established in the early 20th century, the smelter has undergone several upgrades to improve efficiency and reduce environmental impact. The facility employs advanced technologies to minimize emissions and ensure compliance with environmental regulations, contributing to sustainable mining practices in the region.