Rosemont Copper is the name of a proposed new and large open pit copper mine project pursued by the Canadian mining corporation Hudbay Minerals. It has undergone a permitting review process under the direction of the United States Forest Service and the U.S. Army Corps of Engineers and has been delayed by legal judgements and suspension of its operating permit by the US Army Corps of Engineers . The project site is located within the Santa Rita Mountains and Coronado National Forest, in Pima County of southern Arizona.