“Theresa Mine” operated from 1895 until 1900. May 8, 2014 by Matt Thomas“Theresa Mine” operated from 1895 until 1900. Vindicator Valley Trail About Matt Thomas Matt is an avid writer and explorer, who loves to showcase his home state of Colorado. His favorite place to be is right here in the Centennial State. Previous Post:Vindicator Valley Trail – Victor