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The Old Hat Mining District in Pinal County, comprising the famous gold mines including the Collins, Mohawk and Mammoth, saw its earliest beginnings with the Hackney claim discovered in 1879 by ...
Although prospecting was undertaken as early as the 1850s in what became known as the Mammoth Mining District or the Old Hat Mining District, it was not until 1881 that mining intensified. Located 3 ...
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