A federal study released Thursday determined hardrock mining in a Minnesota wilderness area would risk contaminating the area.
In its assessment, the U.S. Forest Service said copper-nickel mining would pose a major risk to the Boundary Waters Canoe Area Wilderness. While the assessment is a draft, it proposes a 20-year ban on copper mining on federal lands in the watershed.
https://thehill.com/policy/energy-environment/3535013-forest-service-finds-mining-would-pose-risk-to-minnesota-watershed/
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