Augusta Resource Corporation is a Canada-based company, engaged in the acquisition, exploration and development of natural mineral resource properties. Its only material property is the Rosemont copper property located in Pima County, Arizona (the Rosemont Property). The Rosemont Property consists of approximately 30,000 acres of patented and unpatented claims and fee land and surface grazing leases. Rosemont contains an open-pit mineable copper/molybdenum/silver skarn deposit, as well as other exploration targets. The Company has four wholly owned material subsidiaries: Augusta Resource (Canada) Corporation (incorporated in British Columbia), Augusta Resource (the United States) Corporation (organized under the laws of Nevada), Augusta Resource (the United States) Holding Corporation (organized under the laws of Nevada) and Rosemont Copper Company (organized under the laws of Arizona).