Echo Bay (Port Radium)

Northwest Territories, east shore of Great Bear Lake, Canada

UraniumAg-U-Cu (Ni, Co, Bi)

Type

U-Ni-Ag-Cu veins (five-element association)

Veins along NE-SW fractures in about 1800 Ma andesitic tuffs (Cliff Series), adjacent to the old Eldorado mine at Port Radium; 1971 production of about 75 t silver and 300 t copper. Seven stages: quartz-hematite, pitchblende, Co-Ni arsenides with native silver and bismuth, early acanthite, main sulphide and dolomite, late native silver, mckinstryite. About 120 °C (stages 1 to 4), 200 °C (stages 5 and 6), below 95 °C (stage 7), at 2.5 to 4.5 km depth; halite-bearing inclusions with about 30 wt% salts. Fluid at δ18O +1.0 ± 2.5 ‰, δ34S ΣS +25 ± 3 ‰ and δ13C ΣC -5 ± 2 ‰: seawater circulating and boiling around a diabase at about 1450 Ma according to the authors; sulphide δ34S from -22 ‰ (early acanthite) to +27 ‰ (mckinstryite), through a progressive decrease of the fluid oxidation state. Coordinates from the authors.

@misc{isofind2026echobayportradiumisotopesigna,
  title = {Echo Bay (Port Radium), isotope signatures},
  author = {{IsoFind Atlas}},
  year = {2026},
  url = {https://www.isofind.tech/isotopes/en/deposits/echo-bay-port-radium/},
  note = {Accessed 2026-10-14}
}

Updated : 2026-10-14