File:Gold ore (auriferous altered rhyolite) (Golden Wonder Vein, Late Oligocene, 27.5 Ma; Golden Wonder Mine, San Juan Mountains, Colorado, USA) 2 (25246150567).jpg
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Summary[edit]
_(Golden_Wonder_Vein,_Late_Oligocene,_27.5_Ma;_Golden_Wonder_Mine,_San_Juan_Mountains,_Colorado,_USA)_2_(25246150567).jpg&action=edit§ion=1){kind=link}
| Description |
Gold ore from the Tertiary of Colorado, USA. (cut slice) This complex rock is gold ore from the rich mining districts of southwestern Colorado's San Juan Mountains. The rock itself (= mottled grayish with whitish-yellowish spotting) is an altered rhyolite (it has also been called a quartzose trachyte or liparite). The dark gray to black areas are the telluride mineral petzite (Ag3AuTe2 - silver gold telluride). The tiny, bright, lustrous, gold-colored specks (click on the photo to zoom in and look around) are native gold (Au). The sample comes from the Golden Wonder Vein at the Golden Wonder Mine. The rocks there are part of an epithermal hot springs gold-alunite deposit. The rhyolite host rock has been subjected to acid-sulfate alteration (= solfataric alteration), during which precious metal mineralization occurred. The rhyolite host rocks are inferred to be the upper intrusive/subvent portion of the Golden Wonder Rhyolite, a late-stage emplaced mass of cooled magma along the structural rim of the 27.6 to 28.6 million years-old Uncompahgre Caldera. Geologic context and age: Golden Wonder Vein, hosted in the Golden Wonder Rhyolite, Uncompahgre Peak Volcanics, western San Juan Volcanic Field, mid-Oligocene to lower Upper Oligocene, ~27.1 to 28.5 Ma; mineralization was probably contemporaneous with Golden Fleece Mine mineralization at 27.5 Ma, early Late Oligocene, but in a different hydrothermal system. Locality: unrecorded site in the Golden Wonder Mine, upper reaches of Deadman Gulch, Gold Hill, ~4 air kilometers southeast of Lake City, Lake City Mining District, San Juan Mountains, northern Hinsdale County, southwestern Colorado, USA (one surface adit is at ~38° 00' 18.24" North latitude, 107° 16' 49.93" West longitude) |
| Date | |
| Source | Gold ore (auriferous altered rhyolite) (Golden Wonder Vein, Late Oligocene, 27.5 Ma; Golden Wonder Mine, San Juan Mountains, Colorado, USA) 2 |
| Author | James St. John |
Licensing[edit]
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/25246150567. It was reviewed on 4 November 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 14:37, 4 November 2019 | | 3,548 × 1,949 (4.48 MB) | Ainz Ooal Gown (talk | contribs) | Transferred from Flickr via #flickr2commons |
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