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The Orapa diamond mine is the world's largest diamond mine by area. The mine is located in Orapa, a town in the Central District of Botswana about 240 km (150 mi) west of the city of Francistown. Orapa ("resting place for lions") is owned by Debswana, a partnership between the De Beers company and the government of Botswana. [1]
Rock core samples, the product of a diamond rig.A pied butcherbird perches nearby.. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill.
Roguelike (or rogue-like) is a style of role-playing game traditionally characterized by a dungeon crawl through procedurally generated levels, turn-based gameplay, grid-based movement, and permanent death of the player character.
Pages 8, 12 [7] The Malu mine extends vertically below the bottom of the open pit. The Ankata mine opened in 2012 and is about 2 km west of the main mine. Ankata means dragon lizard in a local indigenous language. [8] It is accessed from a decline portal in the pit wall to access a deposit removed from the main one.
The spread of coal use was gradual until the late 11th century when a timber shortage in north China produced a fast-paced expansion in coal mining and consumption. [12] In 1000 AD, Chinese mines were ahead of most mining advancements [clarification needed] in the world. [13] Coal mines in China faced similar problems to European ones.
The lease licensed access to 59 square kilometers. Nautilus was allowed to mine to a depth of 1,600 meters for a period of 20 years. [47] [46] The company then began the process of gathering the materials and raising money for the project. [48] The intent was to mine a high grade copper-gold resource from a weakly active hydrothermal vent. [49]
If the exposure is constrained by the need to achieve some required depth of field (with the same shutter speed) then the exposures will be in inverse relation to the sensor area, producing the interesting result that if depth of field is a constraint, image shot noise is not dependent on sensor area. For identical f-number lenses the signal to ...
The Cullinan is estimated to have formed in Earth's mantle transition zone at a depth of 410–660 km (255–410 miles) and reached the surface 1.18 billion years ago. [3] It was found 5.5 metres (18 ft) below the surface at Premier Mine in Cullinan , Transvaal Colony , by Frederick Wells, surface manager at the mine, on 26 January 1905.