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Madison Lead Mine (Carroll County Mine; Eaton Lead Mine), Madison, Carroll Co., New Hampshire, USA

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Latitude & Longitude (WGS84): 43° 51' 15'' North , 71° 9' 15'' West
Latitude & Longitude (decimal): 43.85417,-71.15417
GeoHash:G#: drv3kz7j5
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate

Hydrothermal fault breccia deposit mined for lead, silver, zinc and iron. The mine opened in 1826 when the area was a part of the town of Eaton, and so older references call it the Eaton lead mine. Madison became a separate town in 1852.

In 1870 the mine was operated by the Carroll County Lead and Zinc Mining Company. Twenty-two men were employed at that time, eleven above ground and eleven below ground. (Fogg, 1874)

The mine operated intermittently until 1918.

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

29 valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Devonian - Silurian
358.9 - 443.8 Ma

ID: 3185212
Paleozoic intrusive rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

407.6 - 410.8 Ma

ID: 2883347
Littleton Formation, undivided

Age: Early Devonian (407.6 - 410.8 Ma)

Stratigraphic Name: Littleton Formation

Description: Gray metapelite and metawacke and subordinate metavolcanic rocks; generally, but not everywhere, conformable with underlying Fitch or Madrid Formations. Fossiliferous in western New Hampshire.

Comments: Part of the Central Maine Composite Terrane (Central Maine Trough) - Variably metamorphosed sedimentary and volcanic rocks of greenschist to granulite facies, locally migmatized. Area includes structural belts between the Monroe fault on the west and the Campbell Hill fault on the east; that is, the Bronson Hill anticlinorium, Piedmont allochthon, Kearsarge-central Maine synclinorium, central New Hampshire anticlinorium, and Rochester-Lebanon (Maine) antiformal synclinorium.

Lithology: Major:{metagraywacke}, Minor:{metavolcanic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

This page 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.


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Jackson, Charles (1844). Final Report on the Geology and Mineralogy of the State of New Hampshire.
Hitchcock, Charles (1869). First Annual Report upon the Geology and Mineralogy of the State of New Hampshire, p. 25.
Fogg, Alonzo J. (1874). Statistics and Gazetteer of New Hampshire
Rocks & Minerals (1947): 22: 1136.
Cox, Dennis P. (1970). Lead-zinc-silver deposits related to the White Mountain Plutonic Series in New Hampshire and Maine; USGS Bulletin 1312-D.
Smith, Art (2001). A Page From a Collector's Notebook: The Wulfenite Mystery of the Madison Mine, Madison, Carroll County, New Hampshire. Mineral News: 17(4): 1-8.
Smith, Art (2005). Madison Mine, Madison, Carroll County, New Hampshire, Mineral News: 21(3): 1.
Smith, Art (2005). The Madison Mine, Madison, Carroll County, New Hampshire: An Addendum (2005) The Backbender's Gazzette HGMS, January 2005.
Madison Historical Society (2008). Get the Lead Out: Story of the Madison Lead Mine, 72 pages.

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