Database name: |
World Fe-oxide+/-Cu-Au-U (IOCG) deposits |
Compilers: |
Sunil S. Gandhi |
Release date: |
2015-03-03 |
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Deposit group name(s): |
Lou Lake; NICO |
Political location(s): |
Canada; Province or state: Northwest Territories; Nearest community: Yellowknife (160 km NW) |
NTS map data: |
085N10 (Bea Lake) |
Deposit clan (type): |
Cloncurry-type |
Deposit (sub) types: |
the best example of stratabound, disseminated and veined mineralization of Cloncurry-type in Canada; mineralization mainly in the metasediments but straddles the unconformity with volcanic rocks above; Reference: Gandhi, S. S.; Mortensen, J. K.; Prasad, N.; van Breemen, O., 2001: Magmatic evolution of the southern Great Bear continental arc, northwestern Canadian Shield: geochronological constraints; Canadian Journal of Earth Sciences, Volume 38, p. 767 - 785 |
Deposit group status: |
advanced prospect; Status comments: 42 Mt |
Geologic province: |
Wopmay Orogen |
Geologic subprovince: |
Great Bear Continental Arc |
Geologic district: |
Southern Great Bear Magmatic Zone |
Deposit object located: |
centre-deposit on surface |
Commodities: |
Au; Bi; Co; Cu; W; Ag |
Geological ages: |
Late Paleoproterozoic (host rocks) |
Tectonic setting: |
continental arc (host rocks) |
Coincident features: |
unconformity (metasedimentary strata of Treasure Lake Group dip 50-70° to the north; unmetamorphosed rhyolitic volcanic rocks dip gently to the NE); Coincident feature name: Treasure Lake Group-Great Bear Arc |
Regional tectonic structure: |
collision zone of the Hottah terrane and the Slave craton (late orogenic stage; eastward subduction beneath the Slave craton led to the continental collision and arc magmatism) Tectonic structure name: Great Bear continental arc |
Host rocks: |
(1) metamorphic; metasedimentary schist or gneiss (siltstone-iron formation-sandstone sequence); Depositional setting: continental arc; Metamorphic grade: amphiboliteExternal host rock forms: | well bedded | Host rock protoliths: | Fe-rich argillaceous and silty beds (massive magnetite as thin beds and laminae common at the ore zone); Host rock protolith name: Treasure Lake Group | Internal host rock structures: | foliated to layered; crenulated | Individual lithologies: | iron formation (thinly bedded argillite, magnetite-rich argillite, massive magnetite and siltstone form a stratigraphic horizon favourable for mineralization) | Host rock stratigraphy: | Treasure Lake Group |
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Metallogenic signatures: |
Au-Bi-Co-Cu-W-As |
Mineralogy: |
(alteration): hematite, ferro-hornblende, annite (Fe-rich biotite), k-feldspar, diopside-hedenbergite, calcite, apatite, ferro-actinolite, chlorite, tourmaline (gangue): quartz, biotite, feldspar (mineralization): magnetite, chalcopyrite, pyrite, pyrrhotite, gold, native bismuth, bismuth tellurides, bismuth sulphosalts, bismuthinite, cobaltite, loellingite, cobaltian arsenopyrite, scheelite, arsenopyrite |
Deposit group shape: |
zone of stacked tabular bodies and lenses |
Qualified comments: |
(Applies to: discovery and development) Discovered in 1930s; trenching and shallow drilling in 1960s; drilling in late 1990s outlined 42 Mt of measured reources in Bowl zone grading 0.1 % Co, 0.5 g/t Au and 0.12 % Bi; with some Ag, Cu and W. Additional indicated and inferred resources in the Bowl zone, tested by 225 holes, are 86.6 Mt as of 1998; average grade of the total 128.6 Mt is 0.07 % Co, 0.543 g/t Au, 0.078 % Bi and 0.052 % Cu . Further drilling till 2003 reached a total of 290 holes; revealed higher gold values in sections between the zones; feasibility study for open pit plus underground mining. |
References: |
Gandhi, S. S.; Lentz, D. R., 1990 |
Bi-Co-Cu-Au-As and U Occurrences in the Snare Group Metasediments and Felsic Volcanics of the Southern Great Bear Magmatic Zone, Lou Lake, Northwest Territories |
in Current Research 1990, Part C, Edited by Geological Survey of Canada, Paper, Geological Survey of Canada, 90-1C, p. 239 - 253 |
Gandhi, S. S.; Prasad, N.; Charbonneau, B. W., 1996 |
Geological and Geophysical Signatures of a Large Polymetallic Exploration Target at Lou Lake, Southern Great Bear Magmatic Zone, Northwest Territories |
in Current Research 1996 Part E , Edited by Geological Survey of Canada, Paper, Geological Survey of Canada, 1996-E, 286 p, p. 147 - 158 |
Gandhi, S. S.; Mortensen, J. K.; Prasad, N.; van Breemen, O., 2001 |
Magmatic evolution of the southern Great Bear continental arc, northwestern Canadian Shield: geochronological constraints |
Canadian Journal of Earth Sciences, Volume 38, p. 767 - 785 |
Goad, R. E., 1998 |
The NICO and Sue-Dianne Proterozoic Iron Oxide-Hosted Polymetallic Deposits, Southern Great Bear Magmatic Zone, Northwest Territories - A Summary of Current Work and Deposit Model Development in Global Mineral Exploration |
in 26th Yellowknife Geoscience Forum, Program and Abstracts of Talks and Posters, Edited by Anonymous, Department of Indian and Northern Affairs, 121 p, p. 46 - 49 |
Goad, R. E.; Mumin, A. H. ; Duke, N. A.; Neale, K. L.; Mulligan, D. L.; Camier, W. J., 2000 |
The NICO and Sue-Dianne Proterozoic, Iron Oxide-hosted, Polymetallic Deposits, Northwest Territories: Application of the Olympic Dam Model in Exploration |
Exploration and Mining Geology, Volume 9, p. 123 - 140 |
Hetu, R. J.; Holman, P. B.; Charbonneau, B. W.; Prasad, N.; Gandhi, S. S., 1994 |
Multiparameter Airborne Geophysical Survey of the Mazenod Lake Area, Northwest Territories, 1993 (NTS 85N/10 and Parts of 85N/11, 14, 15): Scale 1:100000 |
Open File, Geological Survey of Canada, Geological Survey of Canada, Publication code 2806, 100 p., 12 maps. |
Mulligan, D. L., 1995 |
Proterozoic Iron Oxide and As-Co-Bi-Cu Vein Mineralization at the NICO Property, N.W.T. |
B.Sc. Thesis, University of Western Ontario, London, 77 p. |
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Resource data: |
Disclaimer - Reserves/Resource Data
Her Majesty the Queen in Right of Canada, represented by the Minister of Natural Resources (NRCan) does not warrant or guarantee the accuracy, completeness or fitness for any purpose of Reserve and Resource information (Data) contained in this database, including whether the Data is compliant with any securities regulations or standards, and NRCan does not assume any liability with respect to any damage or loss incurred as a result of the use made of the Data.
Resource and reserve figures are historical in nature. The Data source provided with each set of figures should be cited if the Data are re-reported. |
Estimate date: 2006-12-31; Component: total; 7.289 million metric tons ore; Combined with production?: no; Provisional entry?: no; Resource category: proven reserveGrade-commodity information: | Au: 1.27 grams/metric ton Bi: 0.16 percent Co: 0.16 percent | Reference: Anonymous, 2007: Fortune Minerals Announces Positive Nico Bankable Feasibility Study; Fortune Minerals Limited, News Releases, Internet Percent weights allocated to camp: 100.0%
Estimate date: 2006-12-31; Component: total; 14.528 million metric tons ore; Combined with production?: no; Provisional entry?: no; Resource category: probable reserveGrade-commodity information: | Au: 0.99 grams/metric ton Bi: 0.16 percent Co: 0.13 percent | Reference: Anonymous, 2007: Fortune Minerals Announces Positive Nico Bankable Feasibility Study; Fortune Minerals Limited, News Releases, Internet Percent weights allocated to camp: 100.0% |
Associated deposit(s): |
NICO Deposit (534), NICO Zone 1 (535), NICO Zone 2 (536), NICO Zone 3 (537), Lou Lake East Zone (538), Summit Peak Zone (Lou Lake) (539) |