Strip mining bauxite ore
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Aluminium Ore Bauxite in Africa
Description:Western cities such as Denver and Sacramento originated as mining towns. In-situ deposits lie in blanket form on top of the original igneous rock, whereas transported bauxite deposits are generally smaller and resemble a wedge, with the earlier topography determining the base of the deposit. Prior to the invention of this process, and prior to the Deville process , aluminium ore was refined by heating ore along with elemental sodium or potassium in a vacuum. Bauxite reserves are estimated to be 55 to 75 billion metric tons, primarily spread across Africa 32 percent , Oceania 23 percent , South America and the Caribbean 21 percent and Asia 18 percent. This provides something for the new aluminium hydroxide to precipitate around. Examples include the silver mines of Laurium , which helped support the Greek city state of Athens. Other methods include shrinkage stope mining , which is mining upward, creating a sloping underground room, long wall mining , which is grinding a long ore surface underground, and room and pillar mining, which is removing ore from rooms while leaving pillars in place to support the roof of the room. Since the beginning of civilization, people have used stone , ceramics and, later, metals found close to the Earth 's surface. Environmental restoration goals continue to advance. In the early colonial history of the Americas, "native gold and silver was quickly expropriated and sent back to Spain in fleets of gold- and silver-laden galleons,"  the gold and silver originating mostly from mines in Central and South America.