Montana

One of the last operating lead smelters in the country, the East Helena Plant was finally shut down in April 2001. The 141-acre plant, which opened in 1888, produced around 750 tons of lead bullion per day, as well as the marketable by-product sulfuric acid....

Large open pit copper mine with over 17 billion gallons of wastewater contaminated from mining operations. The pit and much of the surrounding mines and smelting areas, including the Anaconda area and the 120-mile long Clark Fork River drainage area, have...

One of six radon health mines in this part of Montana, which apparently are the only active radon health mines in the United States. The Earth Angel, a former gold mine, has the strongest concentration of radon gas, limiting users to 20 visits at a stretch (...

Largest volume embankment dam in the USA (96,050,000 cubic meters), the second largest in the world (follows Tarbela Dam in Pakistan -- 148,500,000 cubic meters).

Visitors to this former uranium mine enter the ionizing inhalatorium, to receive the healthful effects of the naturally occurring (and naturally radioactive) radon gas, said to be a wonder cure for numerous ailments. One of a half-dozen or so similar radon...

One of six radon health mines in this part of Montana, which apparently are the only active radon health mines in the United States. This is the smallest of the six.

A base supporting the 50 local Minuteman III ICBM missile silos. This base removed the last Minuteman II Intercontinental Ballistic Missile in the Air Force's inventory from its silo in 1995, as part of a major arms reduction treaty. Much of the other Air Force...

An inactive gold mine which naturally emits radon gas, that has been developed into a healing center, with benches lining the 500 foot long shaft to accomodate visitors. The proprietors tout the cleansing effects of radon, and recommend 40 one hour-long...

This is a reservoir contaminated with mining waste, including high concentrations of arsenic. Mining sediments from the mines at Anaconda and Butte flowed downstream and became concentrated in the sediment behind the dam. The reservoir is part of the largest EPA...

A 90-foot white statue of Mary, Mother of Jesus, located on a 8,510 foot mountain, looming over the vast open pit mines of Butte. The statue, which is lit up at night, was constructed by volunteers using donated materials, and was completed in 1985.

A complex of above ground and underground buildings in remote southwest Montana, constructed by the religious organization known as the Church Universal and Trimphant (CUT), whose worldwide membership was once estimated at 30,000 to 50,000 people. In the late...

An inactive mine which naturally emits radon gas, that has been developed into a healing center, with tables and chairs set up to accomodate visitors. The proprietors tout the cleansing effects of radon, and recommend 32 sessions in the mine every year for...

Several (more than three) explosions detonated five to six feet below the surface, by the late Dennis Oppenheim in 1977. Craters four to twelve feet in diameter. He called them "knuckle marks left on the earth." Apparently, no traces are visible.