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Cuyuna Range Underground Mine Drifts
The Cuyuna Range Underground Mine Drifts polyline shapefile coverage comprises the digitized drifts from found surface and level maps of the Cuyuna Range underground natural iron ore mines (Not all levels of the Armour No. 1, Armour No. 2, and Croft mines were digitized). Drifts are horizontal or inclined passageways in underground mines.