
Crosby and Ironton stand at the heart of the Cuyuna Iron Range, where the landscape is deeply defined by the heritage of open-pit mining. The northern portion of the sheet is dominated by deep basins like Portsmouth Mine and Pennington Mine, many of which have filled with water, creating a unique pattern of industrial lakes. This mid-1970s view captures the transition of the region, as mining operations such as the Louise Mine and Manuel Mine sit alongside developing recreation areas at Serpent Lake and Crosby Beach.
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