Superior, Arizona Crane Exam Prep in a Copper Mining Town

From the Silver Queen to the No. 10 shaft

Copper was found at the Silver Queen in 1875. Magma Copper Company formed in 1910, built a smelter in the 1920s and eventually ran nine shafts in the district. The smelter's 300-foot stack, a local landmark since 1921, was demolished in November 2018. Mine headframes, hoists, ore bins and smelter equipment are the kind of heavy, awkward loads that built generations of riggers here.

Magma's geologists discovered the deep Resolution ore body in 1995, more than 3,300 feet below the surface east of town. The project now belongs to Resolution Copper, a Rio Tinto and BHP venture. Cementation USA finished sinking the No. 10 shaft to 6,943 feet, which it described as the deepest single-lift shaft in the United States, and the older No. 9 shaft was rehabilitated for ventilation. Shaft sinking and headframe work involve some of the most demanding lifts in mining.

Where Resolution Copper stands, carefully stated

The proposed underground mine depends on Oak Flat, a parcel of national forest east of town that the San Carlos Apache Tribe and other Apache people hold sacred. Congress directed a land exchange in 2014. After years of litigation, a federal appeals court briefly paused the swap in August 2025, then in March 2026 declined to block it; news reports say title transferred on March 13, 2026, and the Forest Service issued its final record of decision days later. Opponents filed an amended lawsuit in federal court in April 2026, and other cases have been pending.

For workers, the honest answer is that nobody can promise when or whether full mine construction starts. Legal challenges, permits and corporate decisions all remain in play. What is certain is that mines, mine contractors and the construction that surrounds any major project expect documented crane and rigging qualification, and that a nationally accredited card goes wherever the work goes, including the Phoenix metro and other copper towns.

Canyon roads, tunnels and tight setups

US 60 east of Superior climbs through Queen Creek Canyon on a bridge and a roughly 1,000-foot tunnel built in 1952 and opened in 1953, replacing the narrow Claypool Tunnel from the 1920s. Oversize loads headed to the Globe-Miami district run that corridor, and lane restrictions and escort rules apply. Inside town, streets are narrow and set on hillsides, and the old mining neighborhoods leave little room for a crane's full outrigger spread.

That geography means plenty of partially extended outrigger setups. Many modern cranes have load charts for reduced spreads, but they only protect you if the crane's system is set for the actual position and you read the correct chart. Exam questions on chart selection and setup exist for exactly this reason.

MSHA, ADOSH and your certification

On active mine property, the federal Mine Safety and Health Administration is generally the safety regulator, with its own training rules. Off the mine, construction falls under ADOSH, Arizona's state OSHA plan, which enforces the federal crane standard: accredited operator certification, an employer evaluation, and qualified riggers and signal persons. Arizona does not issue a separate operator license. Our Arizona requirements guide explains the rules.

Superior is about an hour from the East Valley, so practical exams, which need a real crane and an accredited examiner, are usually taken in the Phoenix area. Globe and the copper towns to the east share much of the same work. For a sense of what certified operators earn statewide, see our salary guide.

• Rigger Level I and II for mine contractors and equipment setting.
• Mobile crane operator for hydraulic cranes on construction and maintenance work.
• Signal person for shaft areas, plant structures and blind picks.
• Service truck crane operator for mechanics and lube-truck crews.