Placer mining WikipediaPlacer mining (/ ˈ p l æ s ər / or / ˈ p l eɪ s ər /) is the mining of stream bed deposits for minerals. This may be done by open-pit (also called open-cast ...Plac

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Asteroid mining WikipediaAsteroid mining is the exploitation of raw materials from asteroids and other minor planets, including near-Earth objects. Minerals can be mined from an asteroid or ...