Dosiye:Roasted Cripple Creek gold ore (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek, Colorado, USA) 4 (17199488901).jpg
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UmwirondoroRoasted Cripple Creek gold ore (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek, Colorado, USA) 4 (17199488901).jpg |
Roasted gold ore from Cripple Creek, Colorado, USA. (public display, Montana Bureau of Mines and Geology Mineral Museum, Butte, Montana, USA) Artificial heating has driven tellurium (Te) away from the original telluride minerals (for example, calaverite), leaving behind vesicular blebs of gold. The Cripple Creek Gold District of central Colorado, USA 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: 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). The gold telluride minerals common in the Cripple Creek Diatreme lack the wonderful, deep rich yellow color of native gold. Some Cripple Creek rock samples have been artificially “roasted” to drive off the tellurium. With heat, the Te readily volatilizes, leaving behind relatively pure gold. The gold patches on the rock below are surficial blisters and crusts of gold having a fine-scale vesicular texture (lots of tiny holes, like a pumice or scoria). |
Itariki | |
Inkomoko | Roasted Cripple Creek gold ore (Cripple Creek Diatreme, Early Oligocene, 32 Ma; Cripple Creek, Colorado, USA) 4 |
Umwanditsi | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/17199488901 (archive). It was reviewed on 4 Ugushyingo 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
4 Ugushyingo 2019
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Itariki/Isaha | Ifoto ntoya | Ibipimo | Umukoresha | Comment | |
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muri iki gihe | 14:31, 4 Ugushyingo 2019 | 1.732 × 1.108 (1,7 MB) | Ainz Ooal Gown | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0,016666666666667) |
F Number | f/4,9 |
ISO speed rating | 250 |
Date and time of data generation | 12:24, 11 Kanama 2010 |
Lens focal length | 18,6 mm |
Image title | |
Width | 4.000 px |
Height | 3.000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 11:06, 19 Mata 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:24, 11 Kanama 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5,90625 |
APEX aperture | 4,59375 |
APEX exposure bias | 0 |
Maximum land aperture | 4,59375 APEX (f/4,91) |
Metering mode | Pattern |
Flash | Flash fired, auto mode, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16.460,905349794 |
Focal plane Y resolution | 16.483,516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 07:06, 19 Mata 2015 |
Unique ID of original document | E32DA8DA26367B7AE8B190ADD3E6E980 |