Smallwood
Northwest Territories, Great Bear Lake, Camsell River sector, Canada
Other hydrothermalAg (Ni, Co, Bi, U)
- Type
- Native silver and Ni-Co arsenide veins (five-element type)
Smallwood mine, lead from a higher-µ source according to the authors. Veins with native silver, Ni-Co arsenides, sulfarsenides, hematite, sulfosalts, native bismuth and sulfides, locally with pitchblende, in volcano-sedimentary roof pendants of the Great Bear batholithic complex (Wopmay orogen, about 1860-1875 Ma); uranium and silver production from 1930 to 1983. Changkakoti et al. (1986): steep, little radiogenic galena lead, highly radiogenic carbonates; multiple and poorly homogenised lead sources, mineralisation age proposed at about 1500 Ma; carbonate Sr from 0.709 to 0.720, above the initial Sr of the Echo Bay volcanics (0.702 ± 0.003). Indicative coordinates: Camsell River property (former Silver Bear, Norex, Northrim and Smallwood mines), position of the Terra mine taken from its Mindat entry (65°36′15″ N, 118°06′55″ W), to within 5 km.
206Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 23.822 | 1 | vein carbonates (calcite and dolomite) Single analysis (9/4V/2L/SW, dolomite). Present-day ratios, not corrected for in situ decay of uranium in the carbonates. | Changkakoti et al. (1986), Pb and Sr isotope compositions of hydrothermal minerals from t… |
207Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 16.252 | 1 | vein carbonates (calcite and dolomite) Single analysis (9/4V/2L/SW, dolomite). Present-day ratios, not corrected for in situ decay of uranium in the carbonates. | Changkakoti et al. (1986), Pb and Sr isotope compositions of hydrothermal minerals from t… |
208Pb/204Pb isotope ratio, no unit Values of the same system
Standard : NIST SRM 981
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 44.126 | 1 | vein carbonates (calcite and dolomite) Single analysis (9/4V/2L/SW, dolomite). Present-day ratios, not corrected for in situ decay of uranium in the carbonates. | Changkakoti et al. (1986), Pb and Sr isotope compositions of hydrothermal minerals from t… |
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.71339 | 1 | vein dolomite Single analysis (9/4V/2L/SW). Rb (ppm), Sr (ppm), 87Rb/86Sr: 9/4V/2L/SW 0.2706, 46.50, 0.0168. Very low Rb/Sr: measured ratios approach those at deposition. | Changkakoti et al. (1986), Pb and Sr isotope compositions of hydrothermal minerals from t… |
Deposits of the same type
- Northrim Canada
- Norex Canada
- Terra (Silver Bear) Canada
- Contact Lake Canada
- McDermitt United States
- Turquoise Ridge (Getchell trend) United States
- Getchell United States
- Mike (Carlin Trend) United States
Cite this page
IsoFind Atlas (2026). Smallwood, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/smallwood/ (accessed 2026-10-22).
@misc{isofind2026smallwoodisotopesignatures,
title = {Smallwood, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/smallwood/},
note = {Accessed 2026-10-22}
}Updated : 2026-10-22