Since 2006, Cementation has been working on the Resolution Project in Arizona, which is operated by Resolution Copper Mining LLC and owned by BHP Billiton and Rio Tinto Group . The $100+ million project includes the rehabilitation and additional development of the existing Neversweat Tunnel, which accesses the shafts approximately 1,000 ft below surface. It also involves the sinking of a 28-ft diameter, concrete-lined shaft to a depth of 7,000 ft below surface. At that depth, rock temperatures are anticipated to be 175 degrees F. The existing No. 9 Shaft will be rehabilitated and dewatered and will eventually be extended as a part of the mine’s permanent ventilation system.