192  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1906,  PART    T. 
The  value  of  the  iron  deposits  of  the  Hartville  iron  range  was 
proved  while  copper  was  being  mined  at  Sunrise.     With  the  exhaus- 
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Fig.  5.— Economic  map  of  the  Hartville  uplift,  Laramie  County,  Wyo. 
tion  of  the  copper  deposits,  Messrs.  I.  S.  Bartlett  and  C.  A.  Guernsey 
began  to  prospect  for  iron  ore,  and  in  1900  Mr.  Guernsey,  having  seg- 
regated most  of  the  larger  deposits,  sold  his  group  of  claims  to  the 
