Metals VIIOnline version Extraction of minerals. Technologies for spanish speakers by tekno TEKNESO 1 Underground Mining 2 Surface Mining This method is much less common, and produces, for example, 15% of minerals in the United States This method requires horizontal, diagonal or vertical accesses This method is more expensive than the other This method generates more risks to workers than the other It consists of digging tunnels or shafts into the earth to reach buried ore deposits The majority of this method (type of minerals extraction) occurs in North America This method gained popularity throughout the 20th century It requires a wide area It causes a serious impact on the environment. With this method, big machines can be used.
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