Dear visitor, the Discovery Center remains closed until further notice. We apologize for the inconvenience.

Dear Customers,

Like you, Asarco Mineral Discovery Center is deeply concerned about the impact to the health and well-being of our employees, customers, and communities from the Coronavirus (COVID-19). Our teams are continuously responding to information from local and national health agencies and taking action to minimize the risk to our customers and associates. Therefore, Asarco Mineral Discovery Center will be closed starting March 17, 2020 until further notice, in an effort to reduce risk and prioritize well-being. We will continue to closely monitor developments related to the virus and update you as our plans evolve and change. Thank you, Asarco Mineral Discovery Center


An 11-foot-diameter tire from a 240-ton haul truck provides a
great photo opportunity for kids and adults.

Nowhere else in the State of Arizona can you find regularly scheduled, public tours of a working open-pit copper mine available without a prior reservation. On your tour, you’ll see how copper ore is mined in the open-pit and then at the center you can see how it is processed in the mill to extract the copper minerals.

The mine tour begins at the Mineral Discovery Center. There you can purchase tickets for the tour and become familiar with the copper mining process in our exhibit center and video theater. There is no admission charge for the Mineral Discovery Center exhibits, Discovery Theater, or gift shop.

Planning a grade school outing?

How about visiting our mine?

Call us and schedule a visit!

New Tour Bus

Tom Phillips, General Manager Mission Mine and Sandra Elizondo,
AMDC Sales Coordinator, show off the new tour bus.

ASARCO recently purchased a new bus for the Mine Tours, offered by the Mineral Discovery Center.

The vehicle, a 2013 Starcraft, has a 40 passenger seat capacity and a fully automatic wheelchair lift. With this new acquisition, the Mineral Discovery Center expects to continue to offer excellent service to the thousands of visitors that take the mine tour every year.

Discovery Center Hours (October through April):

Tuesday through Saturday
Exhibit Center and Gift Shop: 9 am to 5 pm AND Mine Tours 9:30 am, 11:00 am, 12:30 pm, 2:00 pm and 3:30 pm


Sunday and Monday – Closed
Major Holidays – Closed

(520) 625-8233

* Please bring closed toe shoes. No flip-flops or high heels are allowed.
* No pets allowed, except for service dogs.

Mine Tour prices:
$ 10.00 Adults
$ 8.00 Seniors (62+ years) and Active Military
$ 7.00 Children (5-12 years)
Free Children (0-4 years)

The Open-Pit Viewpoint

The first stop on your tour is the Open-Pit Viewpoint on the south rim of the Mission Mine. The viewpoint is securely fenced for your safety, and it has four binocular telescopes to provide a close-up view of the trucks and shovels working in the mine.

The Mission Mine is a quarter-mile deep, two miles from north to south, and a mile-and-three-quarters from east to west. About six times the amount of earth moved to dig the Panama Canal has been mined here.

Two miles long. 1 3/4 miles wide, and 1/4 mile deep

Aerial view of the Mission Complex, looking southwest

The Mission open-pit copper mine was at one time five separate mining properties, but over the years, Asarco has combined them into one integrated mining operation. The mine occupies around 20,000 acres of private, State leased, and Indian land. As of July 2011 there are over 600 employees working three shifts, 24 hours a day, seven days a week.

Each year the mine has the capacity to process about 260,000 tons of copper concentrates which yields 132,700,000 pounds of copper and 1,234,000 ounces of silver. Annually, the Mission mine pays royalties and taxes to the State of Arizona and royalties to the Tohono O’odham Indian nation.

The Mission mine buys goods and services from Arizona vendors, helping to provide additional jobs in Tucson and Pima County.

The South Mill

At the Mill, the copper ore is ground into a powder so the copper minerals can be separated by the froth flotation process. One of our AMDC staff members is here to explain what happens at the mill and to answer your questions.

These mills grind copper ore into fine powder.

These huge mills grind the ore into a fine powder
so the copper minerals can be separated by flotation.

Reclamation Areas

The return trip to the Mineral Discovery Center will take you alongside current reclamation areas. The tailings are nothing more than ground-up rock with the copper minerals removed.

For more information about the mining and milling processes, click the Making Copper button on the menu above.

Back at the Center

When your tour returns to the Mineral Discovery Center, take some time to explore the exhibits both inside and outside. Feel free to ask questions of any staff member. And don’t miss The Company Store gift shop to find that special memento of your visit.