sentences:  During this period, he also served as president and general manager of the Anaconda interests at Cananea, Sonora, rebuilding its metallurgical works.Since 1907, Arizona copper mines have produced over half the nation's copper, much of the first three decades of this copper was processed through mills designed by Ricketts.On November 18, 1915, because of his work in developing the state’s mineral resources, the governor of Arizona honored Ricketts with a medal and special ceremony at the Panama-Pacific Exposition, San Francisco, as the “most distinguished citizen of Arizona.”
  
  Ricketts' most significant metallurgical innovations came in the 1910s.