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O'Neil Mine (Nail Mine), Lake Mombasha, Town of Monroe, Orange Co., New York, USA

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An iron mine in magnetite ore located about 3 miles SE of Monroe and just North of Lake Mombasha. Closed 1880. Workings featured a pit 50 feet deep by 600 feet long (NE - SW) or up to 1,500 feet long by closing (NYS Museum Bull.).

Mineral List

30 entries listed. 22 valid minerals. 1 erroneous literature entry.

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


- The Minerals of New York City & Its Environs, New York Mineralogical Club Bull. Vol. 3, No. 1, Manchester, J.G. (1931): 85
- New York State Museum Bull. Nos. 249-250 (Sep-Oct 1921), Magnetic Iron Deposits of SE NY, Clarke, John M.: Index Map, 45 & 109-110
- Geol. Survey of the State of New York, Geology of Orange Co., Roes, Heinrich (1895): 451-452
- Rocks & Min.: 20:468.

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