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Gold, a chemical element; Genomes OnLine Database; Global-scale Observations of the Limb and Disk, a NASA Explorer Mission of Opportunity; GOLD (parser), an open-source parser-generator of BNF-based grammars; Graduates of the Last Decade, an Institute of Electrical and Electronics Engineers program to garner more university level student members
Placer gold deposits form via gravity, with the density of gold causing it to sink into trap sites within the river bed, or where water velocity drops, such as bends in rivers and behind boulders. Often placer deposits are found within sedimentary rocks and can be billions of years old, for instance the Witwatersrand deposits in South Africa .
Gold cycling starts with the microbial weathering of gold-bearing rocks and minerals which mobilizes gold in the environment via release of elemental gold and solubilization. [ 2 ] [ 3 ] The Witwatersrand gold deposits host approximately 30% of the world's gold resources, a large proportion of which is directly associated with organic carbon ...
Gold stater of Nectanebo II; Perfect Gold, or Fine Gold. One of the few coins minted for ancient Egypt is the gold stater, issued during the 30th Dynasty. The reverse of the gold stater shows a horse reared up on its hind legs. The obverse has the two hieroglyphs for nfr and nb: "Perfect gold", or a common-era term: 'Fine'-gold.
Only gold that is concentrated can be economically recovered. Some 400 million years ago, rocks that would be accreted onto western North America to build California lay at the bottom of a large sea. Subsea volcanoes deposited lava and minerals (including gold) onto the sea floor; sometimes enough that islands were created. [1]
Nebu is the Egyptian symbol for gold. It depicts a golden collar with the ends hanging off the sides and seven spines dangling from the middle. Ancient Egyptians believed that gold was an indestructible and heavenly metal. The sun god, Ra, was often referred to as a mountain of gold. The Royal Tomb was known as the "House of Gold".
Pliny the Elder wrote that lapis lazuli is "opaque and sprinkled with specks of gold". [citation needed] Because the stone combines the blue of the heavens and golden glitter of the sun, it was emblematic of success in the old Jewish tradition. [citation needed] In the early Christian tradition lapis lazuli was regarded as the stone of Virgin Mary.
The total world supply of gold in 2007 was 3,497 tonnes. [124] Gold production does not need to make up for gold demand because gold is a reusable resource. Currently, yearly gold mining produces 2% of the existing above-ground gold which is 158,000 tonnes (as of 2006). [125]