![Stereoview (L): Down in a Colorado gold mine--taking out ore Eagle River Canyon Colorado U.S.A.]()
Stereoview (L): Down in a Colorado gold mine--taking out ore Eagle River Canyon Colorado U.S.A.
![Geology and ore deposits of the Gold brick district, Colorado, (Colorado Geological Survey. Bulletin)]()
Geology and ore deposits of the Gold brick district, Colorado, (Colorado Geological Survey. Bulletin)
![Gold Occurrences of Colorado (Resources Series Number 28)]()
Gold Occurrences of Colorado (Resources Series Number 28)
![Historic Print (M): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.]()
Historic Print (M): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.
![Silver Mining Regions of Colorado: With Some Account of the Different Processes Now Being Introduced for Working the Gold Ores of That Territory - Primary Source Edition]()
Silver Mining Regions of Colorado: With Some Account of the Different Processes Now Being Introduced for Working the Gold Ores of That Territory - Primary Source Edition
![Historic Print (L): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.]()
Historic Print (L): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.
![Silver Mining Regions Of Colorado: With Some Account Of The Different Processes Now Being Introduced For Working The Gold Ores Of That Territory (1865)]()
Silver Mining Regions Of Colorado: With Some Account Of The Different Processes Now Being Introduced For Working The Gold Ores Of That Territory (1865)
![Historic Print (M): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.]()
Historic Print (M): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.
![ORIGINAL PATENT APPLICATION NUMBER 13,537 FOR A PROCESS FOR PRECIPITATING GOLD AND OTHER PRECIOUS METALS FROM SOLUTIONS USED FOR EXTRACTING SUCH METALS FROM THEIR ORES.,(COLORADO, USA).]()
ORIGINAL PATENT APPLICATION NUMBER 13,537 FOR A PROCESS FOR PRECIPITATING GOLD AND OTHER PRECIOUS METALS FROM SOLUTIONS USED FOR EXTRACTING SUCH METALS FROM THEIR ORES.,(COLORADO, USA).
![Historic Print (L): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.]()
Historic Print (L): Down in a Colorado gold mine--taking out ore, Eagle River Canyon, Colorado, U.S.A.
![Gold - Silver Ore Tumble Stones, 10.2804]()
Gold - Silver Ore Tumble Stones, 10.2804
![Structural control of the gold deposits of the Cripple Creek district, Teller County, Colorado (Geological Survey)]()
Structural control of the gold deposits of the Cripple Creek district, Teller County, Colorado (Geological Survey)
![Geology and ore deposits of the Breckenridge district, Colorado, (U.S. Geological survey. Professional paper 75)]()
Geology and ore deposits of the Breckenridge district, Colorado, (U.S. Geological survey. Professional paper 75)
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