File:Florence & Cripple Creek Railroad - 588 boxcar 1 (22389453097).jpg

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This narrow-gauge, wooden boxcar was made in 1898 for the Florence & Cripple Creek Railroad in central Colorado, USA. It is now on display at the Colorado Railroad Museum in Golden, Colorado.

The "Gold Belt Line" logo refers to the Cripple Creek gold mining district, which is famous for its unusual gold and silver mineralization. Precious metal mineralization occurs in the Cripple Creek Diatreme, the root zone of a deeply eroded volcano dating to the Early Oligocene (32 Ma). The dominant lithology at Cripple Creek is the scarce igneous rock phonolite, an alkaline, intermediate, extrusive igneous rock. Cripple Creek gold can be found in its native state (Au), but it typically occurs in the form of gold telluride minerals (for example, sylvanite - (Au,Ag)2Te4, calaverite - AuTe2, petzite - Ag3AuTe2, krennerite - (Au,Ag)Te2, and nagyagite - Pb5Au(Sb,Bi)Te2S6). Silver also occurs in some Cripple Creek minerals, including sylvanite, petzite, krennerite, hessite - Ag2Te, tennantite - (Cu,Ag,Fe,Zn)12As4S13, acanthite - Ag2S, and tetrahedrite - (Cu,Fe,Ag,Zn)12Sb4S13.

For photos of gold- & telluride-bearing rocks, see:

www.flickr.com/photos/jsjgeology/sets/72157645947296033
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Source Florence & Cripple Creek Railroad # 588 boxcar 1
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/22389453097. It was reviewed on 9 November 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

9 November 2015

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Date/TimeThumbnailDimensionsUserComment
current02:32, 9 November 2015Thumbnail for version as of 02:32, 9 November 20152,895 × 1,372 (2.93 MB)Oaktree b (talk | contribs)Transferred from Flickr via Flickr2Commons

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