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  Rito Seco, Costilla County, Colorado 

  Contributor:Van Diest, Edmond C.; Gross, John
  Date:1934
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  Preliminary report on mines, A 

  Contributor:Ripley, Winfield; Marks, John H. (John Henry)
  Date:1948
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  Rito Seco mines, Costilla County, Colo. : abstracts of reports 

  Contributor:George, R. D.
  Date:1931-1940
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  Copy of report of Mr. John H. Marks made on the Gem and Seaton Mountain Consolidated mines given to Mr. W.E. Renshaw, September 16, 1933 

  Contributor:Marks, John H. (John Henry)
  Date:1933
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  Gem mines, miscellaneous papers 

  Contributor:Unknown
  Date:1900-1999?
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  Pine Martin group 

  Contributor:Unknown
  Date:1907-1999?
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  Gem mines, The 

  Contributor:Marks, John H. (John Henry); Henry B. Clifford & Co.
  Date:1930-1939?
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  Holy Cross Exploration Company 

  Contributor:Holy Cross Exploration Company
  Date:1900-1999?
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  Gilman Mining Company property, Eagle County, Colorado 

  Contributor:Beckworth, O. Q.; Myers, C. H. U.; Fairchild, C. H.; Cockerill Zinc Company
  Date:1905-1911
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  Extract from Belden Mine report 

  Contributor:Fairish, Wm. A.; Bell, J. Ralston; American Zinc Extraction Co.
  Date:1900-1999?
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  Preliminary report, Cooper placers, Eagle County, Colorado, 1932 

  Contributor:Marks, John H. (John Henry)
  Date:1932
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  Reconnaissance on Silver Swan property, Rico, Colo. 

  Contributor:Prosser, Warren C. (Warren Charles)
  Date:1916
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  Expectation Mining Company property, Rico, Colorado, The 

  Contributor:Ayler, Maynard F.
  Date:1963
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  Union Carbonate group, Dolores County, Colorado 

  Contributor:Prosser, Warren C. (Warren Charles); Wuensch, A. F.
  Date:1892-1916?
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  Report on the property of the Emma Gold Mining Company 

  Contributor:Unknown
  Date:1913

  The company's mining claims were Lion, Great Bear, Orion, Little Emma, Mayflower, Brooklyn, Sirius, and Orion Mill Site and were located at Dunton, Colorado.
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  Reconnaissance, Aztec Mine, Rico, Colorado 

  Contributor:Prosser, Warren C. (Warren Charles)
  Date:1899-1910?

  Aztec property included Aztec, Collar and Cuff, and Trio claims and was located in Aztec Gulch north of Rico. Iron property included Iron, Iron Mine, Lucky Number, and Uncertainty lode mining claims and was located at the ...
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  Rico Metals Company, Dolores County, Colorado 

  Contributor:Blomfield, A.; Maul, R. J.; McClave, J. M. (James M.); Sheard, A.; Stalmann, Otto; United Rico Mines Company
  Date:1907-1908

  Includes reports and correspondence relating to Rico Metals Company and United Rico Mines Company, Dolores County, Colorado, dated from 1907 to 1908; some reports are undated.
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  Letter of correspondence regarding the Little Maggie Mine at Rico 

  Contributor:Unknown
  Date:1900

  "Little Maggie Mine is located on Expectation Mountain across the Dolores River from Newman Hill"--page 4.
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  Assay reports for Gem mine 

  Contributor:W. L. Shaffer & Co.
  Date:1921-1926
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  Zinc ore dressing in Colorado : Marion Mines and Mill Company 

  Contributor:Parmelee, H. C.; Emmons, Samuel Franklin, 1841-1911
  Date:1907

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