Stock Photo - Marble, Minnesota - Hill Annex Mine State Park. The park centers around an open pit mine, now flooded, where iron ore was extracted from 1913 to 1978. The Clubhouse building has been turned into a museum.

Stock Photo: Marble, Minnesota - Hill Annex Mine State Park. The park centers around an open pit mine, now flooded, where iron ore was extracted from 1913 to 1978.

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