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Ham and Weeks Mine (Weeks Feldspar Quarry; Ham-Weeks pegmatite), Wakefield, Carroll Co., New Hampshire, USA

This page kindly sponsored by Maine Mineralogical and Geological Society
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Latitude & Longitude (WGS84): 43° 40' 14'' North , 71° 0' 29'' West
Latitude & Longitude (decimal): 43.67056,-71.00806
GeoHash:G#: drv82jvx2
Locality type:Mine
Köppen climate type:Dfb : Warm-summer humid continental climate

Granite pegmatite. Opened in 1877. Mined for mica, feldspar, and beryl.

The Ham and Weeks Educational and Recreational Area is currently operated by the Maine Mineralogical and Geological Society (MMGS). The site is leased by MMGS, and access is limited to MMGS members. According to the MMGS website:

"Ham and Weeks Mine was first developed by the Mineral Hill Mining Corporation, formed August 7, 1877, by Samuel B. Ames. Shares were sold to buy equipment and mining rights in the area. Originally called the Mica Mine, 2 or 3 acres were worked and the mica was sold for use in stove windows and lamp chimneys. Operations didn’t last too long. As the pit depth increased, an underground spring flooded the pit, and pumps couldn’t keep up with the flow. The original pit is believed to be south of the present pit. The mine was inactive until 1914 or 1915, when the present pit was opened for mica to be used in gas masks for soldiers in WW I. The mica was taken by horse-drawn carts to East Wakefield and loaded unto trains. The mine was closed after a year or two, then re-opened a third time in the 1930’s, when mica was used as electrical insulation in early crystal radio sets; beryl was also reportedly mined for war use."

Cameron et. al. (1954) described the deposit, referred to as the Weeks Feldspar Quarry (named for the owner, Raymond B. Weeks of Burleysville [sic], N.H.): "in the 1920's...feldspar, scrap mica, and beryl were recovered. In the early 1930's, a Mr. Day, Kittery, Maine, operated the quarry for feldspar and scrap mica...In September 1942, J. D. Bardill, District Engineer for the Bureau of Mines, arranged a sampling program under the direction of E. E. Maillot and W. H. Evans. The Bureau of Mines quarried beryl from the north and west sides of the pit, dug 10 small pits and trenches, and drilled 5 horizontal jackhammer holes 12 to 16 feet long in an effort to locate the contacts of the pegmatite. They also pumped out the flooded part of the pit."

Commodity List

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

Mineral List

26 valid minerals. 2 erroneous literature entries.

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 Macrostrat.org

Pennsylvanian - Mississippian
298.9 - 358.9 Ma

ID: 2942029
Two-mica granite of the Sebago batholith and Effingham pluton of eastern New Hampshire

Age: Carboniferous (298.9 - 358.9 Ma)

Comments: Sebago batholith = 325+/-? Rb/Sr per NH026. 325+/-3 U/Pb per NH017. 298+/-2 U/Pb per J.N. Aleinikoff, oral commun., Dec. 24, 1992. Effingham pluton = 325+/-? Rb/Sr per NH026.

Lithology: Major:{granite}

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]

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]

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

This page contains all mineral locality references listed on mindat.org. 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 mindat.org 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pennington, Mary Engle (1895). Derivatives of Columbium and Tantalum (Analysis of Wakefield Columbite). Journal of the American Chemical Society:: 1,(Part 1): 38-66.
Bardill (1943): Weeks Feldspar Quarry, USBM War Minerals Report 81.
Chayes, Felix (1944): Occurence of Chrysoberyl at Wakefield, Carroll County, New Hampshire, American Mineralogist: 29: 320-323.
Cameron, Eugene N.; and others (1954) Pegmatite Investigations, 1942-45, in New England. USGS Professional Paper 255.
Morong, Dana (1983). New Hampshire Mineral Localities, Durham, NH (privately published): 14.
Bearss, Gene T. (1984). The Weeks (Ham) Mine, Wakefield, NH, Micromounters of New England newsletter.
Smith, Arthur and Bearss, Gene (1991): The Weeks Pegmatite Mine, Wakefield, Carroll County, New Hampshire, Rocks & Minerals: 66: 129-135.
Smith, Arthur (2002): Hunting for Uranium Minerals in the Hamm-Weeks Pegmatite, Wakefield, Carroll County, New Hampshire. Mineral News: 18(4)(April).

External Links

http://www.micromountersofnewengland.org/pdfs/weeks-ham-mine.pdf [Bearss, Gene T. (1984). The Weeks (Ham) Mine, Wakefield, NH; Micromounters of New England newsletter]

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