Датотека:Mother Lode Gold OreHarvard mine quartz-gold vein.jpg
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Hydrothermal quartz-gold vein sample (3.2 cm across) from the Harvard Open Pit Mine, northwestern side of Rt. 49/Rt. 108, western side of Woods Creek, just west of Jamestown, western Tuolumne County, Sierra Nevada foothills, central California, USA (37° 56’ 50” North , 120° 36’ 20” West). 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. |
| Datum | |
| Izvor | Hydrothermal quartz-gold vein (Mother Lode Gold Ore, California) 1 |
| Autor | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14532992888. It was reviewed on 1. avgust 2014. by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Datum/vreme | Minijatura | Dimenzije | Korisnik | Komentar | |
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| trenutna | 23:19, 31. jul 2014. | | 1.105 × 770 (143 kB) | Tillman | Transferred from Flickr via Flickr2commons |
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