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Lubec Lead mine (Solomon Thayer Mine), Lubec, Washington Co., Maine, USA

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Latitude & Longitude (WGS84): 44° 50' 23'' North , 67° 3' 9'' West
Latitude & Longitude (decimal): 44.83984,-67.05277
Köppen climate type:Dfb : Warm-summer humid continental climate

Vein sulfide deposit. First mine in coastal Maine, first operated ca. 1832. Scattered dumps along the beach off Lead Mine Road. The local tidal change between high and low tide can be about 6.7 meters (22 feet). Be aware of when the next high tide is and be aware where any places might be covered by water blocking your escape. The location of sea weed growing on the beach rocks shows where the the high tide will cover that part of the beach. Be safe.

Commodity List

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

Mineral List

26 valid minerals. 3 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

419.2 - 443.8 Ma

ID: 2782239
Silurian Leighton Formation, mafic to felsic volcanic rock member

Age: Silurian (419.2 - 443.8 Ma)

Stratigraphic Name: Leighton Formation

Description: Silurian Leighton Formation mafic to felsic volcanic rock member

Comments: Secondary unit description from USGS Geologic Names lexicon (re. ME078): Used as Early Silurian(?) Greenvale Cove Formation. Consists of grayish-violet interlaminated metashale, feldspathic metasandstone, and calc-silicate rock of Piermont allochthon of western NH. GS - Greenschist facies; E - Epidote-amphibolite facies; AA - Low rank amphibolite facies; AB - Medium rank amphibolite facies; Protolith J - Calcareous lithic sandstone

Lithology: Major:{felsic volcanic,mafic volcanic}

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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