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The Big Hole – a former diamond mine in Kimberley, dug to 240 m (790 ft) between 1871 and 1914, making it the deepest hand-excavated pit in the world.Now a museum. The Jagersfontein Mine – operating between 1888 and 1971.
Open-pit mining, also known as open-cast or open-cut mining and in larger contexts mega-mining, [1] is a surface mining technique that extracts rock or minerals from the earth. Open-pit mines are used when deposits of commercially useful ore or rocks are found near the surface where the overburden is relatively thin.
The area where the mine is located is at an average elevation of 5,699 feet (1,737 m). Apaches, Spaniards, Mexicans, and Americans have all obtained native copper and copper ore from this site. The present-day open-pit mining operation was begun in 1910.
New Cornelia mine and the town of Ajo, Arizona. Photo: NASA Native copper specimen from the New Cornelia mine. Size 6.4 x 4.7 x 4.6 cm. Shattuckite with malachite, polished specimen, New Cornelia mine. Size 5.3 x 5.1 x 5.0 cm. The New Cornelia mine is a currently inactive open-pit copper mine in Pima County, Arizona, United States.
The Mountain Pass Rare Earth Mine and Processing Facility, owned by MP Materials, is an open-pit mine of rare-earth elements on the south flank of the Clark Mountain Range in California, 53 miles (85 km) southwest of Las Vegas, Nevada. In 2020 the mine supplied 15.8% of the world's rare-earth production.
The Homestake Mine pit in Lead, South Dakota Typical auriferous (gold-bearing) greenschist gold ore from the Homestake Mine. Two small masses of native gold (Au) are visible near the bottom right. The Homestake Mine was a deep underground gold mine (8,000 feet or 2,438 m) located in Lead, South Dakota.
Kimberley Mine Section. Kimberley Mine shaft. The Kimberley Mine or Tim Kuilmine [1] (Afrikaans: Groot Gat) is an open-pit and underground mine in Kimberley, South Africa, and claimed to be the deepest hole excavated by hand, although this claim is disputed by Jagersfontein. [2]
Covering nearly 30 km 2, it is the second largest open-cast mine in the world. [9] The deepest part of the pit is 400 m lower than the surrounding plateau. Open-pit mining at Nchanga started in 1955, in the main Nchanga open pit. Subsequently, nine medium-sized open pits, called satellite pits, have also been mined at one time or the other.