Ruins of the Grand Central stampmill near the Fairbank ghost town. The stepped stone shelves supported giant crushers used to break up silver-bearing ores from mines in Tombstone. During the silver boom years there were dozens of mills processing the Tombstone silver all along the San Pedro River, which was the only source of water for generating steam to drive the machinery. The sound from the mills, which ran continuously day and night, must have been deafening. 

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