Search results
Results from the WOW.Com Content Network
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 mine is the result of a ten-year exploration and construction program based on a 1999 discovery of the porphyry copper deposit. Production began in 2000. The mine utilizes a "truck and shovel" open-pit mining method, with ore reporting to semi-Autogenous Grinding and ball mills, followed by a flotation circuit. The finished product is a ...
The Siilinjärvi carbonatite complex, [1] an open-pit mine owned by Yara International, in Siilinjärvi, Finland Coal strip mine in Wyoming. Surface mining, including strip mining, open-pit mining and mountaintop removal mining, is a broad category of mining in which soil and rock overlying the mineral deposit (the overburden) are removed, in contrast to underground mining, in which the ...
When coal seams are near the surface, it may be economical to extract the coal using open-cut, also referred to as open-cast, open-pit, mountaintop removal or strip, mining methods. Opencast coal mining recovers a greater proportion of the coal deposit than underground methods, as more of the coal seams in the strata may be exploited. This ...
Construction / Acquisition cost Product(s) Capacity [1] [22] [23] Location(s) Status 1957 Vedanta Resources Plc [24] Ore Mine to Smelter. US$25 million* [25] Copper anodes. LME A grade copper cathodes *Chingola open pit A and Nchanga open pit: 4,500,000 tons of copper ore *Nchanga underground mine: 2,800,000 tons of copper ore
Starting in 2002, the mine utilised both open-pit and underground mining methods for ore extraction. [5] The site of the last open pit to be excavated was Mt Waruwari. [6] When operating, the open pit mine could move up to 160,000 tonnes of rock material and gold-bearing ore daily, and the underground mine over 2,000 tonnes. [7]
The Mexican Mining Chamber (Camimex) opposes the ban on open-pit mining, saying such a prohibition would cause a 1% contraction in the country's GDP and threaten some 200,000 jobs.
A large dragline system used in the open pit mining industry costs approximately US$50–100 million. A typical bucket has a volume ranging from 40 to 80 cubic yards (30 to 60 cubic metres), though extremely large buckets have ranged up to 220 cubic yards (168 cubic meters). [12]