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Since the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010, American law has required publicly traded companies to detail their sources of so-called "conflict minerals" — tungsten, tantalum, tin and gold (known as 3TG), which are found in most modern electronics and in jewelry, cars, airplanes and more.

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Tantalum is a chemical element with symbol Ta and atomic number 73. Previously known as tantalium, its name comes from Tantalus, a villain from Greek mythology. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant.

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Tantalum is found in hard rock deposits such as granites, carbonites and pegmatites (igneous rock that consists of coarse granite). It is not an abundant metal, and mining it is difficult.

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