| http://www.w3.org/ns/prov#value | - In the latter years of the 19th Century, and throughout much of the 20th, Butte, Montana was the center of hard-rock mining in the USA. The tremendous deposits of gold, silver and other minerals mined from deep within The Richest Hill on Earth were impressive enough, but they were completely eclipsed by the copper that was subsequently discovered there at a most opportune time in world history,
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