An iron mine located on Ore Hill near Sugar Hill and Franconia. Started about 1807 and closed 1870. Hydrothermal vein deposit. Ore is in Ammonoosuc volcanics. Workings were up to 150 feet deep and included several prospect pits, adits, and shafts peripheral to the main open-cut with tunnels mine.
References
Gibbs, George (1810). Observations on the Franconia Iron Works (American Mineralogical Journal, Jan. 1810).
Maclure, William (1817). Observations on the Geology of the United States of America (Philadelphia: printed for the author by Abraham Small), p. 32.
Verrow, Harold (1942). Franconia Iron Mine, Lisbon, N.H. (Rocks & Min.: 17:136-139)
Meyers & Stewart (1956). The Geology of New Hampshire: Part III Minerals and Mines. p.85-86.
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