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  2. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Black gold is a type of gold used in jewelry. [16] [17] Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [4]).

  3. Homestake Mine (South Dakota) - Wikipedia

    en.wikipedia.org/wiki/Homestake_Mine_(South_Dakota)

    Homestake high-grade gold ore, view is about 1.2 cm wide. The gold ore mined at Homestake was considered low grade (less than one ounce per ton), but the body of ore was large. [8] Through 2001, the mine produced 39,800,000 troy ounces (43,700,000 oz; 1,240,000 kg) of gold and 9,000,000 troy ounces (9,870,000 oz; 280,000 kg) of silver.

  4. Black Friday (1869) - Wikipedia

    en.wikipedia.org/wiki/Black_Friday_(1869)

    The conspirators would make $15,000 ($305,000 in 2023) for every dollar rise in the price of gold (which was quoted in increments of $100 face value of gold coin, each containing 4.8375 troy ounces). By September 6, the gold quote had risen from $132.50 to $137.

  5. Black gold - Wikipedia

    en.wikipedia.org/wiki/Black_Gold

    Black Gold, Kentucky; Black Gold (horse) (1921–1928), winner of 1924's Kentucky Derby Black gold (jewelry), a type of gold used in jewelry Black gold (politics), a term used in Taiwan to refer to political corruption

  6. Zimbabwean ZiG - Wikipedia

    en.wikipedia.org/wiki/Zimbabwean_ZiG

    Value Dimensions Main colour Obverse Reverse Watermark Date of Ref. printing issue 1 ZiG 155 × 65 mm Blue Balancing rocks of Zimbabwe with trees Liquid gold being moulded on top of a stack of 12 gold bars: Zimbabwe Bird and "RBZ" 2024 not issued [30] 2 ZiG 155 × 65 mm Green 5 ZiG 155 × 65 mm Pink 10 ZiG 155 × 65 mm Navy blue 30 April 2024

  7. Ouro Preto - Wikipedia

    en.wikipedia.org/wiki/Ouro_Preto

    Founded at the end of the 17th century, Ouro Preto (meaning Black Gold) was originally called Vila Rica, or "Rich Village", the focal point of the gold rush and Brazil's golden age in the 18th century under Portuguese rule. Between 1695 and 1696, a gold-bearing stream was discovered in Itacolomi, which would be renamed Gualacho do Sul.

  8. Hierarchy of precious substances - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_of_precious...

    The measurement of sales of popular music starts high relative to the wedding anniversary scale, concentrating on gold and platinum (see gold album).Likewise, credit card companies usually have a "gold card" and a "platinum card" (many formerly had a "silver card" then followed by a "gold card", but due to similarity in appearance between silver and platinum these were often discontinued with ...

  9. Executive Order 6102 - Wikipedia

    en.wikipedia.org/wiki/Executive_Order_6102

    The order also permitted any person to hold up to $100 in gold coins, a face value equivalent to 5 troy ounces (160 g) of gold valued at approximately $10,000 in 2020. The same paragraph also exempted "gold coins having recognized special value to collectors of rare and unusual coins", which protected recognized gold coin collections from legal ...

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