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1848 California gold rush | 1848 California gold rush | ||
1858 Silver mining began on a major scale with the Comstock Lode in Nevada.<ref name="null">[http://en.wikipedia.org/wiki/Silver_mining_in_the_United_States ''Silver Mining in the United States''] Wikipedia Foundation Creative Commons</ref> | |||
1863 First mining of copper in the Bingham Canyon mine (Kennecott Copper Mine)began. | 1863 First mining of copper in the Bingham Canyon mine (Kennecott Copper Mine)began. | ||