Nalunaq Gold Ore, hydrothermal quartz-gold vein, southern Greenland

Forfatter/Opretter:

James St. John

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Nalunaq Gold Ore, hydrothermal quartz-gold vein, Nalunaq Gold Mine, southern Greenland 1

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https://dkwiki.dk/b/4473

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Wikimedia Commons

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beskrivelse:

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.

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CC BY 2.0

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Creative Commons Attribution 2.0