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USMIN Mineral Deposit Database: Prospect and Mine-Related Features

June 5, 2019

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pits, and other features. Data from USGS Data Release,