A blast is shown at the Hill-Annex pit. The Hill-Annex Mine was an open pit iron mine in the Mesabi Range, Minnesota. The Mine started shipping ore in 1914 under Inter-State Iron Company and operated until 1978, producing some 63 million tons of ore. After the Hill-Annex was closed the pit flooded, and the site became a state park in 1988.
Rights management statement available at: http://library.mines.edu/digital/rights.html
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