References

  1.  Mineralogy of Maine, Volume 1: Descriptive Mineralogy, pp 360-361, by Vandall T. King and Eugene E. Foord (1994)
  2.  USGS Bulletin 420 , 1910
  3.   U.S. Geological Survey. Brunswick, Maine, 7.5-Minute Quadrangle. US Topo Series, 1:24,000. U.S. Department of the Interior, U.S. Geological Survey.
  4.  Foord, E.E., Korzeb, S.L., Lichte, F.E., and Fitzpatrick, J.J. (1997). Additional studies on mixed uranyl oxide-hydroxide hydrate alteration products of uraninite from the Palermo and Ruggles granitic pegmatites, Grafton County, New Hampshire. The Canadian Mineralogist, 35, 145–151.
  5.  Report on Reconnaissance Measurements of Natural Radioactivity, Swamp Quarry Tailings Pile, Topsham, Maine, June 8, 2005, paper provided to author by Ed Friedman
  6. An actual Maine open-pit feldspar quarry circa 1935, with the quarry walls, excavation floor, workers, and period equipment. It is the Consolidated (Goldings) Quarry in Georgetown, Maine, not Swamp Mine, but geographically it is also in Sagadahoc County. Photograph: Eastern Illustrating & Publishing Co., courtesy of Penobscot Marine Museum/Maine Memory Network.
  7.  Janeczek, J., and Ewing, R. C. (1997). Structural formula of uraninite. The Canadian Mineralogist, 35, 145–150.
  8.  The ²⁰⁷Pb/²⁰⁶Pb ratio for the Swamp Quarry uraninite is 0.0526, which gives an age of 312 Ma.”  It also reports 2.5 wt.% PbO for the Swamp Mine uraninite and says the lead is radiogenic.  Foord, E.E., Korzeb, S.L., Lichte, F.E. & Fitzpatrick, J.J. (1997).  The Canadian Mineralogist, 35(1), 145–151. 

  9. [8] U.S. Environmental Protection Agency (EPA). “What is EPA’s Action Level for Radon and What Does it Mean?” EPA Radon Program. EPA recommends reducing indoor radon at concentrations of 4 pCi/L or greater and states that there is no known safe level of radon exposure.

  10. ManuelSchottdorf, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0>, via Wikimedia Commons <https://commons.wikimedia.org/wiki/File:Gamma_Spectrum_Uranium_Ore.svg / “Gamma-ray spectrum of natural uranium ore from Moab, UT. Captured via a 1024-channel scintillation spectrometer system. Source: Manuel Schottdorf / Wikimedia Commons.”

  11. Shainin, V. E. (1948). Economic Geology of Some Pegmatites in Topsham, Maine. Maine Geological Survey, Bulletin 5. Original publication

Mineral Dealers

  1. Radioactive Rock,   https://www.radioactiverock.com/
  2. Persson Rare Minerals,   https://perssonrareminerals.com/
  3. e-rocks,   https://e-rocks.com/
  4.  Radman Minerals, https://radmanminerals.com/   Note: currently not shipping the the U.S.

Swamp Mine Location

 Latitude: 43.95028° N
 Longitude: 69.95278° W

USGS Topographical Map: https://ngmdb.usgs.gov/topoview/viewer/#14/43.9543/-69.9511

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