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  2. Nelson complexity index - Wikipedia

    en.wikipedia.org/wiki/Nelson_complexity_index

    Thus, the higher the index number, the greater the cost of the refinery and the higher the value of its products. In the second edition of the book Petroleum Refinery Process Economics (2000), author Robert Maples notes that U.S. refineries rank highest in complexity index, averaging 9.5, compared with Europe's at 6.5.

  3. Chemical plant cost indexes - Wikipedia

    en.wikipedia.org/wiki/Chemical_plant_cost_indexes

    A cost index is the ratio of the actual price in a time period compared to that in a selected base period (a defined point in time or the average price in a certain year), multiplied by 100. Raw materials, products and energy prices, labor and construction costs change at different rates, and plant construction cost indexes are actually a ...

  4. Wohlwill process - Wikipedia

    en.wikipedia.org/wiki/Wohlwill_process

    The resulting gold is 99.999% pure, and of higher purity than gold produced by the other common refining method, the Miller process, which produces gold of 99.5% purity. [1] [2] [3] For industrial gold production the Wohlwill process is necessary for highest purity gold applications.

  5. 15 Best Places To Sell Your Gold for Cash

    www.aol.com/15-best-places-sell-gold-145103625.html

    Cash for Gold USA, an established gold buyer, is a top choice for selling your gold items. They offer competitive rates for a wide range of gold items, including jewelry, scrap gold and gold coins.

  6. Costco is selling gold bars - and the wholesale giant says ...

    www.aol.com/costco-selling-gold-bars-wholesale...

    Wholesale retail store is selling gold bars for nearly $2,000 ... Africa’s Rand Refinery are selling for the whopping price of $1,949.99, while the gold bars from Swiss supplier PAMP Suisse cost ...

  7. Gold extraction - Wikipedia

    en.wikipedia.org/wiki/Gold_extraction

    Gold occurs principally as a native metal, i.e., gold itself.Sometimes it is alloyed to a greater or lesser extent with silver, which is called electrum.Native gold can occur as sizeable nuggets, as fine grains or flakes in alluvial deposits, or as grains or microscopic particles (known as colour) embedded in rock minerals.

  8. Want To Sell Valuable Gold Coins? Here’s How Much Tax You’ll ...

    www.aol.com/finance/want-sell-valuable-gold...

    If you sell your gold coins for a loss, which you ideally won’t do, you don’t have to worry about capital gains taxes. Instead, you can claim a capital loss deduction on your tax return to ...

  9. Doré bar - Wikipedia

    en.wikipedia.org/wiki/Doré_bar

    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 bars mistakenly called "bullion" by miners. They were, more ...

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