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  2. How to invest in copper? 5 ways to buy and sell it - AOL

    www.aol.com/finance/invest-copper-5-ways-buy...

    1. Copper bullion. You can purchase copper bullion just as you would gold bullion, buying it as coins or even bars. You’ll have the enjoyment of holding it and looking at it, but this form of ...

  3. Doré bar - Wikipedia

    en.wikipedia.org/wiki/Doré_bar

    Doré bar. A doré bar is a semi-pure alloy of gold and silver. It is usually created at the site of a mine and then transported to a refinery for further purification. The proportions of silver and gold can vary widely. Doré bars weigh as much as 25 kg. During the 19th century gold rushes, gold nuggets and dust were melted into crude gold ...

  4. Bullion - Wikipedia

    en.wikipedia.org/wiki/Bullion

    Bullion. Bullion is non-ferrous metal that has been refined to a high standard of elemental purity. The term is ordinarily applied to bulk metal used in the production of coins and especially to precious metals such as gold and silver. It comes from the Anglo-Norman term for a melting-house where metal was refined, and earlier from French ...

  5. Gold bar - Wikipedia

    en.wikipedia.org/wiki/Gold_bar

    Gold bar. A gold bar, also known as gold bullion or a gold ingot, refers to a quantity of refined metallic gold that can be shaped in various forms, produced under standardized conditions of manufacture, labeling, and record-keeping. Larger varieties of gold bars, produced by casting molten metal into molds, are called ingots.

  6. List of copper alloys - Wikipedia

    en.wikipedia.org/wiki/List_of_copper_alloys

    The discovery and exploitation of the Bolivian tin belt in the 19th century made tin far cheaper, although forecasts for future supplies are less positive. There are as many as 400 different copper and copper alloy compositions loosely grouped into the categories: copper, high copper alloy, brasses, bronzes, cupronickel, copper–nickel–zinc ...

  7. United States Bullion Depository - Wikipedia

    en.wikipedia.org/wiki/United_States_Bullion...

    The United States Bullion Depository, often known as Fort Knox, is a fortified vault building located next to the United States Army post of Fort Knox, Kentucky. It is operated by the United States Department of the Treasury. The vault is used to store a large portion of the United States' gold reserves as well as other precious items belonging ...

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