Ruggles Mine
New Hampshire, Grafton County (Isinglass Mountain), United States
Magmatic (Ni-Cu-PGE, carbonatites)mica, feldspath (U)
- Type
- Granitic pegmatite with uraninite
Pegmatite dated at about 304 Ma (U-Pb) in quartz-mica schists, quartzites and amphibolites folded and metamorphosed in the Devonian; Th-rich but very REE-poor uraninite (about 0.01 %). Uraninite 87Sr/86Sr measured by Balboni et al. (2016) for nuclear forensics: low ratios (below 0.7200) in low-temperature sandstone deposits, high in pegmatites, veins and breccia pipes. Coordinates from Wikipedia.
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.72507 ± 0.000011 | 1 | pegmatite uraninite Single analysis; value read from the Figure 7 label, 2σ uncertainty. | Balboni et al. (2016), Chemical and Sr isotopic characterization of North America uranium… |
Deposits of the same type
- Greenwood (pegmatites) United States
- Mount Mica United States
- Havey (pegmatite) United States
- Winslow (Maine) United States
- Sudbury Canada
- Alexo Canada
- Hart deposit (Abitibi) Canada
- Carolina tin-spodumene belt United States
Cite this page
IsoFind Atlas (2026). Ruggles Mine, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/ruggles-mine/ (accessed 2026-10-15).
@misc{isofind2026rugglesmineisotopesignatures,
title = {Ruggles Mine, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/ruggles-mine/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15