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Stephanie Adrian of the EPA told Reuters.
High prices for metals, with gold above $1500 an ounce and with worries about Chinese dominance of supplies of rare earths, make recycling more attractive.
One million cellphones can yield 24 kg (53 lb) of gold, 250 kg of silver, 9 kg of palladium and more than 9 tonnes of copper, according experts quoted by the Bonn-based StEP.
In 2006, about a billion cellphone were sold worldwide.
