File:Nalunaq Gold Ore, hydrothermal quartz-gold vein, southern Greenland.jpg
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Summary
[edit]DescriptionNalunaq Gold Ore, hydrothermal quartz-gold vein, southern Greenland.jpg |
Nalunaq Gold Ore (14.3 cm across at its widest) - sample of the “Main Vein” from Level 230E of the Nalunaq Gold Mine, southern Greenland. Whitish-grayish-blackish material = quartz. Small metallic yellow chunks in central top to bottom of photo = gold. Greenish-gray area at right = epidote-diopside-feldspar calc-silicate alteration zone rock (host rock for the quartz-gold vein). The Nalunaq Gold Mine is Greenland’s first gold mine. It's located 33 km northeast of Nanortalik, in the Ketilidian Orogenic Belt of southern Greenland (60º 21’ 29” N, 44º 50’ 11” W). The deposit was discovered in 1992 and mining commenced in 2004. Mining targets the “Main Vein”, a quartz-gold hydrothermal vein emplaced in a 1 to 2 meter wide shear zone (a regional thrust fault). Shear zone hydrothermal quartz-gold occurrences are frequently referred to as “Mother Lode-type gold deposits”, in reference to the Mother Lode of California. Hanging wall rocks at the Nalunaq Mine are Paleoproterozoic amphibolite-facies metadolerites and metavolcanics. Footwall rocks are volcanogenic massive sulfides. Quartz-gold mineralization here has been dated to 1.77 to 1.80 billion years ago (late Paleoproterozoic), during the Ketilidian Orogeny. |
Date | |
Source | Nalunaq Gold Ore, hydrothermal quartz-gold vein, Nalunaq Gold Mine, southern Greenland 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14733900601. 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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current | 21:06, 1 August 2014 | 1,977 × 905 (2.32 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Pixel composition | RGB |
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Orientation | Normal |
Horizontal resolution | 350 dpi |
Vertical resolution | 350 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:45, 24 July 2014 |
Color space | Uncalibrated |
Image width | 1,977 px |
Image height | 905 px |
Date and time of digitizing | 14:44, 24 July 2014 |
Date metadata was last modified | 14:45, 24 July 2014 |