According to the United Nations Environmental Programme, an estimated 50 million tons of electronic waste are generated around the world every year. What's more, the metal deposits found in many types of e-waste can be 40 to 50 times richer than the raw ore extracted from mines. One ton of gold ore, for example, yields 5 grams of gold, on average. However, approximately 150 grams of gold can be found in one ton of phone circuitry.
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