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major mineral mined in 1870

major mineral mined in 1870

The General Mining Act of 1872 is a United States federal law that authorizes and governs prospecting and mining for economic minerals such as gold platinum and silver on federal public lands This law approved on May 10 1872 codified the informal system of acquiring and protecting mining claims on public land formed by prospectors in California and Nevada from the late 1840s through the 1860s


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