This circular presents the results of flow studies for recycling of 26 metal commodities, including chromium, magnesium, niobium, tantalum, molybdenum, cobalt and others. According to this report, recycled metals account for more than half of the U. S. metal supply by weight and about 40 percent by value.

Source: Sibley, S. F. "Flow Studies for Recycling Metal Commodities in the United States". Circular 1196-A-M. U. S. Department of the Interior. U. S. Geological Survey. Reston, Virginia: 2004.
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