DUBUQUE MINING AND TUNNEL COMPANY

DUBUQUE MINING AND TUNNEL COMPANY. The Dubuque Mine is one of the historic Idaho Springs, Colorado mines. (1) It may have been discovered by Hal Sayre who was included in the History of Colorado: (2)

            Sayre came overland from Dubuque, Iowa, in a prairie schooner 
            with oxen, early in 1859, with a man named Peabody, who had 
            worked as a chainman on his Minnesota survey, and finally trekked 
            to Idaho Springs, where George Jackson was washing gold on Chicago 
            Creek. They took a claim higher up, put in sluice boxes and sank a 
            shaft. 'We were all ignoramuses,' said Sayre, 'we didn't know any 
            more about placer mining than jackrabbits.' 

The stock certificate shown is signed by Cripple Creek gold baron and Colburn automobile founder, Judge Ernest A. Colburn - Idaho Springs, Clear Creek County, Colorado 1905. The location in 2015 was also given as Central City, Colorado. (3)

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Source:

1. Map of Dubuque Mine, Colorado. Online: http://www.expertgps.com/data/viewer.asp?lat=39.755266&lon=-105.55222&wpt=Dubuque%20Mine&count=8437&types=Mines&state=Colorado&abbr=co&file=mines

2. History of Colorado, State Historical and Natural Historical Society of Colorado, Denver: Underman Company, Inc., 1927, p. 162. Online: http://archive.org/stream/historycolorad05stat/historycolorad05stat_djvu.txt

3. "Dubuque Mine, Colorado," Online: http://www.eachtown.com/places/Dubuque-Mine;1685491.html