![]() National Park, California and Nevada. NPS photo. Introduction![]() NPS illustration. AMLs includes “features” and “sites.” AML “features” include old mine structures such as headframes or tramways, mine openings such as shafts and adits; piles of waste rock (unprocessed, sub-grade mined rock), mill tailings (reject materials from mined rock that has been processed to remove the desired commodities), and ore; abandoned and orphaned oil and gas wells; fuel storage tanks; drainage diversions; buildings such as mills and assay shops; and abandoned heavy equipment and tools. A collection of these features occurring within a discrete geographic area is called an AML “site.” AML—Natural & Cultural Resources
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Last updated: December 19, 2022