According to a survey completed by the Colorado Geological Survey between 1991 and 1999, the number of abandoned mines in Colorado is 18,382.[1] The Arkansas Headwaters, Las Animas River, Rio Grande Headwaters, Alamosa, and Uncompahgre were the priority watersheds studied in this survey.[1] In the survey, analysis was completed with Environmental Degradation Measures ranging from none to extreme. Results showed 26 abandoned mines with extreme degradation and mineral hazards, 219 with significant degradation, and 672 potentially significant hazards.[1]
In recent years, abandoned mine drainage has led to major environmental events, such as the 2015 Gold King Mine waste water spill..
^ abcSares, Matthew A.; Gusey, Daryl L.; Neubert, John T. (1999). "Abandoned Mines and Naturally Occurring Acid Rock Drainage on National Forest System Lands in Colorado" (PDF). www.coloradogeologicalsurvey.org. Colorado Geological Survey. Retrieved October 25, 2016.
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to a survey completed by the Colorado Geological Survey between 1991 and 1999, the number of abandonedminesinColorado is 18,382. The Arkansas Headwaters...
discharges from active or abandonedmines were called acid minedrainage, or AMD. The term acid rock drainage, or ARD, was introduced in the 1980s and 1990s...
King Mine breach. Many abandonedmines throughout Colorado are known to have problems with acid minedrainage. The chemical processes involved in acid...
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The Summitville mine was a gold mining site in the United States, located in Rio Grande County, Colorado 25 miles (40 km) south of Del Norte. It is remembered...
thousands of abandonedminesin the United States. Many abandonedmines pose environmental challenges, such as acid minedrainage. InColorado alone, there...
today on the Navajo Nation and in the states of Utah, Colorado, New Mexico, and Arizona. More than a thousand abandonedmines have not been contained and...
Colorado (/ˌkɒləˈrædoʊ, -ˈrɑːdoʊ/ KOL-ə-RAD-oh, -RAH-doh, other variants) is a landlocked state in the Mountain West subregion of the Western United...
test-bed for new ways to treat harmful drainage from abandonedminesin the Colorado Rockies. The Mary Murphy Mine is a popular destination for four-wheelers...
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Mine exploration is a hobby in which people visit abandonedmines, quarries, and sometimes operational mines. Enthusiasts usually engage in such activities...
acid minedrainage problems in some regional streams and rivers. The Colorado River region in Mexico became favored place for Americans to invest in agriculture...
the Powder River Basin, with most of the active mining taking place indrainages of the Cheyenne River. The US uses about 600 million tons of coal a year...
The Sulphur Bank Mine is located near Clearlake Oaks and Clear Lake in Lake County, California. The 150-acre (0.61 km2) mine became one of the most noted...
wall of coal is minedin a single slice (typically 0.6–6.0 m (2 ft 0 in – 19 ft 8 in) thick). The section of rock that is being mined, known as the longwall...
dwellings in the U.S. State of Colorado. Archaeologists have agreed on three main periods of occupation by Pueblo peoples in southwestern Colorado: Pueblo...
canals in the United States: This list includes active canals and artificial waterways that are maintained for use by boats. Although some abandoned canals...
from an inflow of water from the Colorado River in 1905. Beginning in 1900, an irrigation canal was dug from the Colorado River to the old Alamo River channel...
the small placer-gold mines currently operating in the US are in Alaska. Seven modern large-scale hard-rock mines operated in Alaska as of 2019[update];...
territory of the Navajo Nation and in the states of Utah, Colorado, New Mexico, and Arizona. Hundreds of abandonedmines have not been cleaned up and present...
provided drainage and ventilation for the mines as well as gravity-assisted ore removal. However, by the time the tunnel reached the Comstock area mines, most...
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