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  2. Metals of antiquity - Wikipedia

    en.wikipedia.org/wiki/Metals_of_antiquity

    Silver is estimated to have been discovered in Asia Minor shortly after copper and gold. [14] There is evidence that iron was known from before 5000 BC. [15] The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BC.

  3. Conservation and restoration of copper-based objects

    en.wikipedia.org/wiki/Conservation_and...

    In North America, copper mining began with marginal workings by Native Americans. Native copper is known to have been extracted from sites on Isle Royale with primitive stone tools between 800 and 1600. [12] Copper metallurgy was flourishing in South America, particularly in Peru around 1000 AD; it proceeded at a much slower rate on other ...

  4. Cultured freshwater pearls - Wikipedia

    en.wikipedia.org/wiki/Cultured_freshwater_pearls

    A bead crochet necklace made from crochet lace, sterling silver, and freshwater pearls. Cultured freshwater pearls are pearls that are farmed and created using freshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China.

  5. Copper extraction - Wikipedia

    en.wikipedia.org/wiki/Copper_extraction

    Copper concentrate is traded either via spot contracts or under long term contracts as an intermediate product in its own right. Often the smelter sells the copper metal itself on behalf of the miner. The miner is paid the price at the time that the smelter-refiner makes the sale, not at the price on the date of delivery of the concentrate.

  6. Native copper - Wikipedia

    en.wikipedia.org/wiki/Native_copper

    Native copper is an uncombined form of copper that occurs as a natural mineral. Copper is one of the few metallic elements to occur in native form, although it most commonly occurs in oxidized states and mixed with other elements. Native copper was an important ore of copper in historic times and was used by pre-historic peoples.

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