Top 10 Mines in the United States
American mining is superlative by habit: the largest open pit, the deepest copper mine, the fire that has burned underground since 1962. The country's mining heritage spans the California Gold Rush, the copper country of Michigan and Montana, the Appalachian coalfields, and the desert porphyry copper of the southwest. Most sites have been converted to heritage attractions of varying quality; the best are among the finest mine visitor experiences in the world.
1. Bingham Canyon, Utah
The Kennecott Bingham Canyon Mine is the largest human-made excavation on earth: 4 kilometres wide, 1.2 kilometres deep, and visible from the International Space Station. Copper-gold-silver-molybdenum commodity; operated by Rio Tinto (Kennecott Utah Copper), continuously active since 1906. A public visitor centre on the pit rim provides overlook access and interpretive displays. The 2013 landslide — the largest non-volcanic landslide in North American recorded history, displacing approximately 165 million tonnes of material — is visible in the interior terracing.
2. Berkeley Pit, Butte, Montana
The Berkeley Pit is a former open-cut copper mine that has filled with acidic, heavy-metal-laden water to form a toxic lake approximately 300 metres deep. Copper commodity; closed 1982, water rising since. A viewing platform is maintained at the pit rim and is one of the most-visited industrial heritage sites in Montana. The water chemistry — pH 2.5, high concentrations of arsenic, cadmium, zinc, and copper — is monitored continuously. A flock of snow geese that landed on the pit in 1995 died within hours; a flock of migrating geese was killed again in 2016. Anaconda Company and Atlantic Richfield Company (ARCO, now BP) are responsible for ongoing water treatment obligations.
3. Quincy Mine, Keweenaw Peninsula, Michigan
The Quincy Mining Company operated from 1846 to 1945 on the Keweenaw Peninsula of Michigan's Upper Peninsula, producing copper from native metal veins in basalt. Copper commodity; closed 1945, National Historic Landmark. The Quincy Mine hoist — a 37-foot flywheel Nordberg steam hoist installed in 1920, the largest steam hoist ever built — is preserved in its engine house and demonstrated. An underground tram tour through a shaft adit provides access to original nineteenth-century native copper workings. The Keweenaw National Historical Park encompasses Quincy and a dozen other sites.
4. Sloss Furnaces, Birmingham, Alabama
Sloss Furnaces is a National Historic Landmark and preserved blast furnace complex in Birmingham, Alabama, that operated from 1882 to 1971 producing pig iron. Iron commodity; closed 1971, museum since 1983. The scale of the blast furnaces, ore bridges, and casting shed is extraordinary. Birmingham was the only city in the world where coal, iron ore, and limestone — all three ingredients of iron smelting — occurred within 10 miles of each other. The workforce history of the furnaces, which relied heavily on convict lease labour from the Alabama prison system through the 1920s, is documented in the museum.
5. Climax Mine, Climax, Colorado
Climax Mine, at 3,800 metres elevation in the Tenmile Range of Colorado, was for most of the twentieth century the world's largest molybdenum mine, producing material for high-strength steel alloys critical to weapons manufacturing. Molybdenum commodity; operated by Freeport-McMoRan Climax Inc., resumed production in 2012 after closure in 1987. No regular public access. The former company town of Climax, at the mine entrance, was one of the highest-elevation inhabited communities in the United States.
6. Sutter's Mill, Coloma, California
The site where James Marshall found gold on 24 January 1848 is preserved as Marshall Gold Discovery State Historic Park. Gold commodity; historic site, gold discovery 1848. A replica of the original sawmill where the discovery was made stands at the site, and rangers lead gold-panning demonstrations in the American River. The park is the starting point of the California Gold Rush, the Mother Lode country, and Highway 49.
7. Calumet and Hecla, Calumet, Michigan
Calumet and Hecla was the most productive copper mining company in the United States from the 1860s to the early 1900s. Copper commodity; principal production 1866–1968. The Keweenaw National Historical Park encompasses the Calumet townscape, the Italian Hall Memorial (site of the 1913 Calumet Massacre, when 73 children and adults died in a panicked stampede during a Christmas Eve celebration — allegedly caused by a false "fire" cry attributed to anti-union agitators), and the surface mine buildings. The Italian Hall memorial and its surrounding park opened in 2013, a century after the tragedy.
8. Anaconda Copper Smelter, Anaconda, Montana
The Anaconda Smelter Stack — at 178 metres, the tallest masonry structure in the world — is the surviving monument of the Anaconda Copper Mining Company's smelting operations. Copper commodity; smelter closed 1980. The stack is preserved as a Montana State Park in a Superfund cleanup area; it cannot be entered but can be viewed from the adjacent parking area. The Anaconda Company, controlled by the Hearst and then Rockefeller interests, was one of the largest and most politically influential corporations in American history.
9. Carlsbad Potash, New Mexico
The Carlsbad basin in southeastern New Mexico is the world's most important source of potassium chloride (potash), essential for agricultural fertiliser. Potash commodity; active underground operations including Mosaic Company and Intrepid Potash mines. The National Potash Museum in Carlsbad covers the industry; the Carlsbad Caverns National Park above the same evaporite formation represents the dissolution of similar carbonate and evaporite sequences on a spectacular scale.
10. Centralia Coal Fire, Centralia, Pennsylvania
In 1962 a coal mine fire was ignited in the abandoned workings beneath Centralia, Pennsylvania, and it has burned continuously ever since. Coal (combustion) commodity; fire ongoing, town population reduced from over 1,000 to fewer than 10 as residents were relocated between 1980 and 2010. Pennsylvania assumed eminent domain over most properties in 1992. Smoke and steam still vent from cracks in Route 61 — the highway that was permanently closed because the ground beneath it is unstable and hot. Centralia is one of the most visited abandoned town sites in the northeastern United States.
Planning a US Mining Route
The Keweenaw Peninsula in Michigan's Upper Peninsula — Quincy, Calumet and Hecla, Delaware Mine, Copper Harbor — is the most concentrated heritage copper district and makes a focused multi-day itinerary. The Keweenaw National Historical Park, established in 1992, provides a unified interpretive framework; the park is unusual in that its primary historic sites are in active private and municipal use rather than being federally managed in their entirety. The California Mother Lode along Highway 49 is a classic driving route — allow two full days to do it justice between Auburn and Downieville. Montana's Butte-Anaconda corridor offers industrial heritage and environmental monument together and rewards at least two days: the Berkeley Pit viewing, the Anselmo Mine headframe, the Uptown Butte historic district, and the Anaconda smelter stack each deserve time. All sites are on the interactive map.
Hardrock vs Coal: Two Regulatory Worlds
American mining heritage reflects a regulatory divide that still shapes the landscape. Coal mining has been regulated at the federal level since the Surface Mining Control and Reclamation Act of 1977, which mandated reclamation bonds and post-closure land restoration. Hardrock mining — gold, silver, copper, molybdenum — remains governed by the General Mining Law of 1872, which allows claims to be patented and mining to proceed on federal public land with no federal reclamation bonding requirement for surface disturbance. This regulatory gap has left thousands of abandoned hardrock mine sites on public land with no financially responsible party obligated to remediate them. The Berkeley Pit, the Animas River Gold King Mine, and the Bunker Hill Superfund site in Idaho's Coeur d'Alene mining district are among the most prominent consequences of 150 years of hardrock mining with inadequate closure requirements.