File:Mother Lode Gold Ore, Grass Valley.jpg
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Summary
[edit]DescriptionMother Lode Gold Ore, Grass Valley.jpg |
Hydrothermal quartz-gold vein sample (Cranbrook Institute of Science specimen, Bloomfield Hills, Michigan, USA) from an unspecified mine at or near Grass Valley, Nevada County, northeast-central California, USA. Geology - hydrothermal quartz-gold veins of the Mother Lode Gold Belt occur in the Melones Fault Zone (= boundary between the Foothills Terrane and the Don Pedro Terrane). To the east of the fault zone is Jurassic slates. To the west of the fault zone is serpentinite melange. Age - The Melones Fault Zone was active principally in the Late Jurassic and Early Cretaceous. Gold-quartz mineralization occurred during the late Early Cretaceous, at about 108 to 127 Ma. |
Date | |
Source | Hydrothermal quartz-gold vein (Mother Lode Gold Ore, California) 2 |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14739581813. It was reviewed on 1 August 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 August 2014
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:19, 31 July 2014 | 1,909 × 1,662 (2.39 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/4.5 |
Date and time of data generation | 11:06, 3 May 2009 |
Lens focal length | 70 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop 7.0 |
File change date and time | 09:08, 5 May 2009 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:06, 3 May 2009 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.3 APEX (f/4.44) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 20 |
DateTimeOriginal subseconds | 20 |
DateTimeDigitized subseconds | 20 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 105 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Soft |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |