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Mt Mica is the oldest gem mine in the USA , There are many underground tunnels within the mines made from these controlled blasts; .
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The History of Mica Mining in Zimbabwe by Tim Broderick 28th November 2014 , reached an underground depth of 130m, and singled out the Gil Gil, .
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Graphite is a natural form of carbon characterized by its hexagonal crystalline structure It is extracted using both open pit and underground mining methods
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