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In 2005, Creighton mine produced an average of 3,755 tons of ore per day on a 6 days per week schedule. 2007 was a breakthrough in mining extraction and exploration, with the conformation of mineralization at depth, [18] which produced 793,000 tonnes of ore with grades of 1.62% copper and 2.8% nickel.
This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world.
By 1912 the mine was at a depth of 1,250 feet (381 m). [4] When the mine closed, level 27 was being developed at 2,341 feet (713.5 m) below the surface and the entire underground workings consisted of more than fifty miles of drifts, adits, and raises. In 1965, US Steel donated the Soudan Mine to the State of Minnesota to use for educational ...
The largest mine in the range, Soudan, was closed in 1962, and the last mine in the Ely area closed in 1964. [2] Despite the effort needed for the deep mining Soudan mine, the ore obtained was worth the effort; the quality of the hematite ore was so pure that two pieces could be welded. [1]
The Sudbury Neutrino Observatory (SNO) was a neutrino observatory located 2100 m underground in Vale's Creighton Mine in Sudbury, Ontario, Canada. The detector was designed to detect solar neutrinos through their interactions with a large tank of heavy water. The detector was turned on in May 1999, and was turned off on 28 November 2006.
SNOLAB is a Canadian underground science laboratory specializing in neutrino and dark matter physics. Located 2 km below the surface in Vale's Creighton nickel mine near Sudbury, Ontario, SNOLAB is an expansion of the existing facilities constructed for the original Sudbury Neutrino Observatory (SNO) solar neutrino experiment.
Once the land was acquired, a new park was created, which included the purchased parcel and the existing Soudan Underground Mine State Park. [8] The new park is called Lake Vermilion-Soudan Underground Mine State Park. [9] The Bois Forte Band of Chippewa has a small reservation on the lake, upon which is located Fortune Bay Resort and Casino.
Water was used to wash coal extracted from the nearby Salem #1 Mine and quench coke from the coke ovens. A second mine, a drift mine called Salem #2, opened in 1938. [3] [4] Even before it was a state park, Keystone Lake was used for recreation. Company executives used the lake for fishing, swimming, and boating.