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- Open-pit_mining abstract "Open-pit mining, open-cut mining or opencast mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.This form of mining differs from extractive methods that require tunneling into the earth such as long wall mining. Open-pit mines are used when deposits of commercially useful minerals or rock are found near the surface; that is, where the overburden (surface material covering the valuable deposit) is relatively thin or the material of interest is structurally unsuitable for tunneling (as would be the case for sand, cinder, and gravel). For minerals that occur deep below the surface - where the overburden is thick or the mineral occurs as veins in hard rock - underground mining methods extract the valued material.Open-pit mines that produce building materials and dimension stone are commonly referred to as quarries.Open-pit mines are typically enlarged until either the mineral resource is exhausted, or an increasing ratio of overburden to ore makes further mining uneconomic. When this occurs, the exhausted mines are sometimes converted to landfills for disposal of solid wastes. However, some form of water control is usually required to keep the mine pit from becoming a lake, if the mine is situated in a climate of considerable precipitation or if any layers of the pit forming the mine border productive aquifers.".
- Open-pit_mining thumbnail Twincreeksblast.jpg?width=300.
- Open-pit_mining wikiPageExternalLink Large%20Surface%20Miners.pdf.
- Open-pit_mining wikiPageExternalLink openpitmines.
- Open-pit_mining wikiPageExternalLink open_pit.htm.
- Open-pit_mining wikiPageExternalLink feature-top-ten-deepest-open-pit-mines-world.
- Open-pit_mining wikiPageID "208433".
- Open-pit_mining wikiPageRevisionID "603491366".
- Open-pit_mining caption "Open-pit sulfur mining at Tarnobrzeg, Poland currently in land rehabilitation process".
- Open-pit_mining fullheight "1464".
- Open-pit_mining fullwidth "12000".
- Open-pit_mining hasPhotoCollection Open-pit_mining.
- Open-pit_mining height "230".
- Open-pit_mining subject Category:Surface_mining.
- Open-pit_mining comment "Open-pit mining, open-cut mining or opencast mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow.This form of mining differs from extractive methods that require tunneling into the earth such as long wall mining.".
- Open-pit_mining label "Open-pit mining".
- Open-pit_mining sameAs m.01dlxy.
- Open-pit_mining sameAs Q15104297.
- Open-pit_mining sameAs Q15104297.
- Open-pit_mining wasDerivedFrom Open-pit_mining?oldid=603491366.
- Open-pit_mining depiction Twincreeksblast.jpg.
- Open-pit_mining isPrimaryTopicOf Open-pit_mining.
