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Historical production of metals in the western United States has left a legacy of acidic drainage and toxic metals in many mountain watersheds that are a potential threat to human and ecosystem health. Studies of the effects of historical mining on surface water chemistry and riparian habitat in the Animas River watershed have shown that cost-effective remediation of mine sites must be carefully planned. Of the more than 5400 mine, mill, and prospect sites in the watershed, Published in Understanding and Responding to Hazardous Substances at Mine Sites in the Western United States: Geological Society of America, Reviews in Engineering Geology, on pages 47 - 83, in 2007.