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Abandoned mines in the United States

In the United States there are thousands of abandoned mines. The precise number of abandoned mines in the United States remains unknown, ranging "from the National Park Service's tally of 2,500 on its lands, to the Mineral Policy Center's assessment of 560,000 abandoned mines on public and privately owned lands." Many of these abandoned mines are associated with abandoned neighboring towns often referred to as ghost towns. Experts strongly warn against entering or exploring old or abandoned mines. In California, Nevada, Colorado, New Mexico and Arkansas, there are over 6,500 abandoned mines according to infographic.

Danger sign at an old Arizona mine.

In the U.S., the estimation is that approximately 80% of the abandoned mine lands (AML) sites pose physical safety hazards and require more work in determining true safety of these lands.

Every year, dozens are injured or killed in recreational accidents on mine property. The majority of the deaths are unrelated to mine exploration, however. Drownings in open quarries and ATV accidents on abandoned mine properties are the main cause of accidental death. The U.S. Department of Labor notes that since 1999, "more than 200 people have died in recreational accidents at surface and underground active and abandoned operations across the country." Due to these circumstances, the Mine Safety and Health Administration launched the "Stay Out – Stay Alive" campaign, which is a national public awareness campaign aimed at warning and educating children and adults about the dangers of exploring and playing on active and abandoned mine sites.

In the U.S., the Abandoned Mine Land Initiative, launched by the Western Governor's Association and the National Mining Association is also an effort focusing on reporting the number of high-priority AML sites. The initiative identifies, measures and reports on the progress of current reclamation cleanup programs on an annual basis. In the Americas region, the United Nations Environment Programme (UNEP) and the Chilean Copper Commission (COHILCO) co-hosted a workshop to address the problem of abandoned or "orphaned" mines. Including a representative from the UN, ten countries were represented from North, Central and South America with an eleventh participant being Japan.

Surface Mining Control and Reclaimation Act (SMCRA)

It can be hazardous and detrimental to reside close to an abandoned coal mining site. The Surface Mining Control and Reclaimation Act was passed in 1977 in two parts; one to control effects of active mines, and one to regulate abandoned mines. SMCRA also initiated an abandoned mine land fund, in which a fee was charged for each ton of coal produced. This revenue was distributed in part to the United Mine Workers Association (UMWA) towards retirement funds, as well as to the Office of Surface Mining Reclaimation and Enforcement (OSMRE) to continue operations. There is still around $2 billion in funds that are undistributed thus far.

Abandoned Mines in Canada

The Ontario Mining Act describes "abandoned mines" as an old land previously used for coal mining but is now unused due to hazardous environmental and health effects. There are approximately 10,139 abandoned mines currently in Canada. Research is being done to utilize geothermal systems in these abandoned mines as a renewable heating source, and has shown to be quite cost efficient.

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For the film, see Abandoned Mine.

An abandoned mine is a mine or quarry which is no longer producing or operational, though definitions vary. An abandoned mine may be a hazard to health, safety or environment.