File:Old chromite mine (Beartooth Plateau, Montana, USA) 2.jpg
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Summary[edit]
DescriptionOld chromite mine (Beartooth Plateau, Montana, USA) 2.jpg |
English: The Red Lodge Mining District is located near the southeastern termination of the Beartooth Mountains, southwest of the town of Red Lodge in southern Montana, USA. Active mining took place during the 1940s. Most of the old, small mines occur on the high plateaus or just below the eroded plateau edges.
Mines in the Red Lodge District targeted chromium ores in the form of black-colored chromitite rocks hosted in serpentinite and bastite (= serpentinized pyroxene). In this area, lenses, or pods, or fault-chopped stratiform bodies of serpentinite occur among high-grade metamorphic rocks such as quartzites, gneisses, migmatites, amphibolites, etc. Chromitite is a coarsely-crystalline textured, intrusive igneous rock that is rich in the mineral chromite (FeCr2O4 - iron chromium oxide). The rocks in the Beartooth Mountains are very old. They are principally Archean in age (2.5+ billion years old). The chromite-bearing serpentinite bodies of the Red Lodge District were originally chromite-bearing peridotites (dunites) of early Neoarchean age, or older. Granulite-grade to upper amphibolite-grade regional metamorphism at about 2.75 Ga altered the original dunites to serpentinites. The rocks of the area were also altered by greenschist-grade metamorphism between 1.6 to 1.8 billion years ago, during the late Paleoproterozoic. Locality: old chromite mine, near the eroded edge of the Beartooth Plateau, southeastern side of Rock Creek Canyon, southwest of the town of Red Lodge, Red Lodge Chromite District (Red Lodge Mining District), Beartooth Mountains, southern Montana, USA (45° 02' 04.36" North latitude, 109° 24' 35.11" West longitude) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/52574579361/ |
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@N05/52574579361. It was reviewed on 20 December 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
20 December 2022
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current | 13:44, 20 December 2022 | 3,968 × 2,768 (8.02 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/52574579361/ with UploadWizard |
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Metadata
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Camera manufacturer | OLYMPUS IMAGING CORP. |
Camera model | TG-1 |
Exposure time | 1/250 sec (0.004) |
F-number | f/8 |
ISO speed rating | 100 |
Date and time of data generation | 11:07, 13 August 2013 |
Lens focal length | 4.5 mm |
Width | 3,968 px |
Height | 2,976 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 314 dpi |
Vertical resolution | 314 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 23:34, 19 December 2022 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.3 |
Date and time of digitizing | 11:07, 13 August 2013 |
Meaning of each component |
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APEX shutter speed | 7.965784 |
APEX aperture | 6 |
APEX exposure bias | 0 |
Maximum land aperture | 2 APEX (f/2) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 25 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Receiver status | Measurement interoperability |
Reference for direction of image | Magnetic direction |
Direction of image | 197 |
GPS tag version | 0.0.3.2 |
Serial number of camera | BCA539215 |
Date metadata was last modified | 18:34, 19 December 2022 |
Unique ID of original document | C118100A367D23A4390F4FB3F044A232 |
IIM version | 32,767 |