Underground hard-rock mining refers to various underground mining techniques used to excavate "hard" minerals, usually those containing metals, such as ore containing gold, silver, iron, copper, zinc, nickel, tin, and lead. It also involves the same techniques used to excavate ores of gems, such as diamonds and rubies. Soft-rock mining refers to the excavation of softer minerals, such as salt, coal, and oil sands.
Jackson is a city in and the county seat of Amador County, California. Its population was 4,651 at the 2010 census, up from 3,989 at the 2000 census. The city is accessible by both State Route 49 and State Route 88.
The Gold Country is a historic region in the northern portion of the U.S. state of California, that is primarily on the western slope of the Sierra Nevada. It is famed for the mineral deposits and gold mines that attracted waves of immigrants, known as the 49ers, during the 1849 California Gold Rush.
The Comstock Lode is a lode of silver ore located under the eastern slope of Mount Davidson, a peak in the Virginia Range in Virginia City, Nevada, which was the first major discovery of silver ore in the United States and named after American miner Henry Comstock.
Agnico Eagle Mines Limited is a Canadian-based gold producer with operations in Canada, Finland, Australia and Mexico and exploration and development activities extending to the United States. Agnico Eagle has full exposure to higher gold prices consistent with its policy of no-forward gold sales. It has paid a cash dividend every year since 1983.
The Minesota Mine is a former copper mine near Rockland, Ontonagon County in the Upper Peninsula of the U.S. state of Michigan. The Minesota was one of the most productive and famous early mines in the Michigan Copper Country.
The Argonaut Mine is a gold mine in Jackson, California, United States. The deposit was discovered 1850 and was the site of the worst gold-mining disaster in the state's history. The mine closed in 1942 and, along with the nearby Kennedy Mine, is registered as California Historical Landmark #786.
Empire Mine State Historic Park is a state-protected mine and park in the Sierra Nevada mountains in Grass Valley, California, U.S. The Empire Mine is on the National Register of Historic Places, a federal Historic District, and a California Historical Landmark. Since 1975 California State Parks has administered and maintained the mine as a historic site. The Empire Mine is "one of the oldest, largest, deepest, longest and richest gold mines in California". Between 1850 and its closure in 1956, the Empire Mine produced 5.8 million ounces of gold, extracted from 367 miles (591 km) of underground passages.
Morro Velho, also called AngloGold Ashanti Brasil Mineração, after its current owner AngloGold Ashanti, is a complex of gold mines located near the city of Nova Lima in the Minas Gerais state of Brazil.
The Georgia Gold Rush was the second significant gold rush in the United States and the first in Georgia, and overshadowed the previous rush in North Carolina. It started in 1829 in present-day Lumpkin County near the county seat, Dahlonega, and soon spread through the North Georgia mountains, following the Georgia Gold Belt. By the early 1840s, gold became difficult to find. Many Georgia miners moved west when gold was found in the Sierra Nevada in 1848, starting the California Gold Rush. Since the 16th century, American Indians in Georgia told European explorers that the small amounts of gold which they possessed came from mountains of the interior. Some poorly documented accounts exist of Spanish or French mining gold in North Georgia between 1560 and 1690, but they are based on supposition and on rumors passed on by Indians. In summing up known sources, W.S. Yeates observed: "Many of these accounts and traditions seem to be quite plausible. Nevertheless, it is hardly probable that the Spaniards would have abandoned mines which were afterwards found to be quite profitable, as those in North Georgia."
Dolcoath mine was a copper and tin mine in Camborne, Cornwall, United Kingdom. Its name derives from the Cornish for 'Old Ground', and it was also affectionately known as The Queen of Cornish Mines. The site is north-west of Carn Brea. Dolcoath Road runs between the A3047 road and Chapel Hill. The site is south of this road.
The Treadwell gold mine was on the south side of Douglas Island, .5-mile (0.80 km) east of downtown Douglas and southeast of downtown Juneau, owned and operated by John Treadwell. Composed of four sub-sites, Treadwell was in its time the largest hard rock gold mine in the world, employing over 2,000 people. Between 1881 and 1922, over 3 million troy ounces of gold were extracted. Not much remains today except for a few crumbling buildings and a "glory hole". Although John Treadwell had twelve years of experience in both placer and lode mines, he was a carpenter and builder by trade who had come to Alaska prior to the Klondike Gold Rush.
Hecla Mining is a gold, silver, and other precious metals mining company based in Coeur d'Alene, Idaho. Founded in 1891, it is the second-largest mining company that produces silver in the country. This area is known as the Silver Valley (Idaho). In 1983, this entire area was designated as a Superfund site by the Environmental Protection Agency, because of land, water, and air contamination resulting from a century of mostly unregulated silver and gold mining.
The Gwalia Gold Mine is located at Gwalia, a few kilometres south of Leonora, Western Australia. It was originally established by Welsh miners in the late 19th century and Herbert Hoover, the later President of the United States, served as the mine manager in its early days from May to November 1898.
The North Star Mine and Powerhouse are located on Lafayette Hill a short distance south of Grass Valley in the U.S. state of California. It was the second largest producer of gold during California's Gold Rush. In 1898, the largest Pelton wheel for its time was built for the mine. The North Star Mine Company also owned locations on Weimar Hill, adjoining and south of the North Star Mine. It shut down during World War II after its consolidation with the Empire Mine.
The Mohawk Mining Company was a major copper mining company, based in the Keweenaw Peninsula of Michigan, that was established in November 1898 and lasted until 1932. The company, between 1906 and 1932, paid out more than $15 million in shareholder dividends. The Mine is best known for the large amounts of mohawkite that were found on the property. The Mohawk mine operated until 1932; in 1934 it was purchased by the Copper Range Company.
Day Dawn mine remains is a heritage-listed mine ruins at Paull Street, Charters Towers City, Charters Towers, Charters Towers Region, Queensland, Australia. It was built from 1891 to 1913. It was added to the Queensland Heritage Register on 29 April 2003.
Charters Towers mine shafts are a heritage-listed group of mine shafts and ruins at Charters Towers, Charters Towers Region, Queensland, Australia. It was built from 1883 to 1916. It was added to the Queensland Heritage Register on 29 April 2003.
Golden Gate Mining and Town Complex is a heritage-listed mining camp at Normanton Road, Croydon, Shire of Croydon, Queensland, Australia. It commenced in 1886. It is also known as Golden Gate Township, Croydon Consols Pump Shaft, Golden Gate No.10 North Mine, Golden Gate Cemetery, Croydon Consols Battery and Cyanide Plant, and Golden Gate Mine. It was added to the Queensland Heritage Register on 14 August 2009.
Barrow Colliery was a coal mine in Worsbrough, South Yorkshire, England. It was first dug in 1873, with the first coal being brought to the surface in January 1876. It was the scene of a major incident in 1907 when seven miners died. After 109 years of coaling operations, the mine was closed in May 1985.
