Palermo No. 1 Mine (Palermo No. 1 pegmatite; Hartford Mine; GE Mine), Groton, Grafton Co., New Hampshire, USA
|Latitude & Longitude (WGS84):||43° 45' 4'' North , 71° 53' 22'' West|
|Latitude & Longitude (decimal):||43.75130,-71.88956|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
Located near the village of North Groton, on the southeast flank of Bald Mountain. Mined for mica beginning in 1863, though not on a serious level until the Hartford Mining company worked it from 1878 to 1888. Later it was a source of beryl, feldspar, and quartz, too. The mine first became known as the Palermo Mine in 1888 when it was purchased by the Palermo Mining Company of Schenectady, New York. When General Electric owned and operated it from 1898 to 1945 it was known as the GE Mine, which produced muscovite, microcline and beryl. The name reverted to Palermo Mine when the Ashley Mining Corp. leased it from GE from 1945 to 1958 and since then that name has remained. It was owned by the Mountain Mining Company until 1973 and leased to N. E. Materials (Rex Howard, who mined the quartz core) and later Peter Samuelson. Since 1973 it has been owned by the Palermo Mining Co. LTD and operated almost solely for mineral specimens, including many rare phosphate species. (Whitmore and Lawrence, 2004).
Fuller (1898) reported on a pocket at the mine which was said to be ten feet in diameter. A quartz crystal, three feet in diameter, was taken from the roof of the pocket, according to the mine superintendent at the time.
Mindat ArticlesPre Hibernation Collecting by Paul Gilmore
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
154 valid minerals. 13 (TL) - type locality of valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc. 7 erroneous literature entries.
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
|Devonian - Silurian|
358.9 - 443.8 Ma
|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. 
393.3 - 419.2 Ma
|Littleton Formation, Upper unnamed member|
Age: Early Devonian (393.3 - 419.2 Ma)
Stratigraphic Name: Littleton Formation
Description: Light-gray metaturbidite, lithologically identical to, and probably correlative with, the Seboomook Formation of Maine. Coticule layers common.
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.
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.