Contact Lake
Northwest Territories, Great Bear Lake, Echo Bay sector, Canada
Other hydrothermalAg (Ni, Co, Bi, U)
- Type
- Native silver and Ni-Co arsenide veins (five-element type)
The only deposit of the district whose veins are hosted by a high-level granodioritic member of the batholith rather than by the volcano-sedimentary roof pendants. 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: Echo Bay sector south-east of Port Radium (Figure 1 of Changkakoti et al., 1986), to within 15 km.
87Sr/86Sr isotope ratio, no unit Values of the same system
Standard : NIST SRM 987
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 0.70983 | 1 | vein dolomite Single analysis (CL/9). Rb (ppm), Sr (ppm), 87Rb/86Sr: CL/9 0.0524, 48.71, 0.0031. 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
- Terra (Silver Bear) Canada
- Northrim Canada
- Norex Canada
- Smallwood Canada
- McDermitt United States
- Turquoise Ridge (Getchell trend) United States
- Getchell United States
- Mike (Carlin Trend) United States
Cite this page
IsoFind Atlas (2026). Contact Lake, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/contact-lake/ (accessed 2026-10-22).
@misc{isofind2026contactlakeisotopesignatures,
title = {Contact Lake, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/contact-lake/},
note = {Accessed 2026-10-22}
}Updated : 2026-10-22