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National Park Service - NatureNet Geologic Resources

National Park Service - NatureNet Geologic Resources

Details the issues, hazards, and remediation techniques associated with abandoned mines and resource producing properties of the past on national park land. Abandoned mineral lands, commonly known as AML, are one of many types of disturbed lands in the National Park System. AML sites are 1) underground and surface mines, 2) placer and dredge sites, and 3) oil, gas, and geothermal wells. Commodities mined at these sites ranged from soft rocks such as coal and sand/gravel to hard rock minerals such as gold, lead, and copper. Sites can contain waste rock (unprocessed rock), tailings (processed rock), abandoned roads, fuel storage tanks, drainage diversions, buildings such as mills and assay shops, deteriorating structures such as headframes and tramways, and abandoned heavy equipment.

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