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  2. Touchstone (assaying tool) - Wikipedia

    en.wikipedia.org/wiki/Touchstone_(assaying_tool)

    This, in turn, led to the widespread adoption of gold as a standard of exchange. Although mixing gold with less expensive materials was common in coinage, using a touchstone one could easily determine the quantity of gold in the coin, and thereby calculate its intrinsic worth.

  3. Gold prospecting - Wikipedia

    en.wikipedia.org/wiki/Gold_prospecting

    A gold pan. Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prospecting has also become a popular outdoor recreation. Gold prospecting has been popular since ...

  4. Metal detector - Wikipedia

    en.wikipedia.org/wiki/Metal_detector

    The sale of metal detectors is allowed in France. The first use of metal detectors in France which led to archaeological discoveries occurred in 1958: people living in the city of Graincourt-lès-Havrincourt who were seeking copper from World War I bombshell with military mine detector found a Roman silver treasure. [21]

  5. Karatmeter - Wikipedia

    en.wikipedia.org/wiki/Karatmeter

    There are many models of Gold Purity Testing machines available - from portable (light weight) to industrial grade machines. Apart from X-ray spectrometer technique, other older traditional methods are using the TouchStone and Acid to test the gold purity. But TouchStone and Acid are destructive testing - a tiny sample of gold is cut and then ...

  6. Long-range locator - Wikipedia

    en.wikipedia.org/wiki/Long-range_locator

    A long-range locator is a class of fraudulent devices purported to be a type of metal detector, supposedly able to detect a variety of substances, including gold, drugs and explosives; most are said to operate on a principle of resonance with the material being detected.

  7. Recreational gold mining - Wikipedia

    en.wikipedia.org/wiki/Recreational_gold_mining

    This 156-troy-ounce (4.9 kg) gold nugget, known as the Mojave Nugget, was found by an individual prospector in the Southern California desert using a metal detector. Recreational gold mining and prospecting has become a popular outdoor activity several countries, including New Zealand (particularly in Otago), Australia, South Africa, Wales (at ...

  8. Find and remove unusual activity on your AOL account

    help.aol.com/articles/find-and-remove-unusual...

    Monitoring your recent login activity can help you find out if your account has been accessed by unauthorized users. Review your recent activity and revoke access to suspicious entries using the info below. Remove suspicious activity. From a desktop or mobile browser, sign in and visit the Recent activity page. Depending on how you access your ...

  9. Acid test - Wikipedia

    en.wikipedia.org/wiki/Acid_test

    The figurative usage of the expression gained popularity during and after the California Gold Rush, [7] but had currency even before then. An example from the Wisconsin paper The Columbia Reporter, November 1845, illustrates this: "Twenty-four years of service demonstrates his ability to stand the acid test, as Gibson’s Soap Polish has done for over thirty years."

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