File:Gossan (Khuchaynik Dolostone, Neoproterozoic; ridge west of Lone Mountain, southwest-central Alaska) 12.jpg

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Description
English: Gossan is a porous, iron hydroxy-oxide rock formed by oxidative weathering of sulfide-rich rocks. This gossan occurred as surface float on a late Precambrian dolostone outcrop near Lone Mountain, Alaska. The dolostone rocks lacked obvious sulfide mineralization, however.

Host unit: Khuchaynik Dolostone, Neoproterozoic

Locality: crest of first major north-south trending ridge west of Lone Mountain [the true Lone Mountain, which caps out at 2646' elevation - the USGS topo. map & Google Earth have incorrectly labeled Lone Mountain] (SE 1/4 of section 14, T28N, R30W, McGrath C-4 1:63,360 United States Geological Survey topographic map), east of Big River, Yukon-Koyukuk County, southwest-central Alaska (= locality of Babcock et al., 1994, United States Geological Survey Bulletin 2107, p. 146) (vicinity of 62° 30’ 49.87" North latitude, 154° 46' 41.05" West longitude)

See info. at:

en.wikipedia.org/wiki/Gossan
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Source https://www.flickr.com/photos/47445767@N05/51183894127/
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@N05/51183894127. It was reviewed on 18 May 2021 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

18 May 2021

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current17:36, 18 May 2021Thumbnail for version as of 17:36, 18 May 20212,848 × 2,432 (5.14 MB)Ser Amantio di Nicolao (talk | contribs)Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/51183894127/ with UploadWizard

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