General Information
Secondary Commodities: barite, uranium, thorium, gold
Deposit Type(s): Iron Oxide Breccias & Veins (Wernecke Breccias)
Location(s): 65.128890 N, -134.382780 W
NTS Mapsheet(s): 106E01
Location Comments: 1 Kilometres
Hand Samples Available at YGS: No
Capsule
Work History
Staked in Jul-Oct/75 by Wernecke JV (Chevron Can L & Aquitaine) as Wernecke cl (Y97944), which were explored with mapping, sampling and a radiometric survey in 1975; mapping and radiometric surveys in 1976 by Eldorado Nuclear L under a brief option: ground and airborne radiometric surveys in 1978 and chip sampling and prospecting in 1981. In 1982, Eldorado changed its name to Eldor Res Ltd.
Fringe staking in 1976 included QUA & Bon cl (YA1594) to the southwest in Feb by Hesca Res L, which performed geochem sampling and trenching in 1977; Kid cl (YA1881) to the northwest in March and Rin cl (YA14799) to the west in Dec by Rio Alto EL, which conducted a track-etch radon survey in 1976 and optioned its claims to Marline O (Alberta) in 1977, which explored by airborne radiometric surveys in 1978; and MTR cl (YA1546) to the northeast in Feb by Sioux Mountain ML (west half) and New Minex Res L (east half). New Minex explored with geochem and radiometric surveys and hand trenching in 1976 and 1977.
Capsule Geology
The region is underlain by a metamorphosed and altered sequence of Early Proterozoic Wernecke Supergroup clastic and carbonate rocks (Fairchild Lake Group, Quartet Group and Gillespie Lake Group, from oldest to youngest) that are intruded by Early to Middle Proterozoic mafic sills and dykes, and cut by Middle Proterozoic Wernecke Breccia. To the east, Wernecke Supergroup rocks are unconformably overlain by Middle Proterozoic Pinguicula Group rocks. According to Thorkelson (2000), Wernecke Breccia development is best modeled as a set of hydrothermal and/or phreatic breccias; brecciation being caused by explosive expanson of volatile-rich fluids. Hunt (2005) attributed Wernecke Breccia formation to periodic over-pressuring of dominantly basinal fluids, which lead to repeated brecciation of host strata and mineral precipitation.
The claims contain at least five separate brannerite occurrences near the margin of Wernecke Breccia bodies that cut Quartet Group limy argillite. The best zone, situated at the north end of the mountain, consists of coarse disseminations with minor thorite and uranothorite in a 150- by 10-m zone of bleached, silicified argillite at the breccia contact. Gold, barium and copper are associated with the radioactive zone in minor quantities. Age dating by Wernecke JV gave a date of 745 Ma (U-Pb) from the brannerite, significantly younger than either the Wernecke Breccia or Wernecke Supergroup rocks, and likely reflects later remobilization of uranium by a thermal or tectonic event.
Hand specimens from the zone returned assays up to 1.12% U3O8 and 1.2 g/t Au but the average grade is less than 0.03% U3O8 and trace Au. Two uranium and one copper-uranium geochem anomalies were reported by New Minex while Hesca also obtained anomalous uranium values.
Prospecting by Rio Alto located a small area of mineralization assaying 0.07% U3O8.
References
ELDORADO NUCLEAR LTD, Sep/76. Assessment Report #061618 by C.J. Riley.
ELDORADO NUCLEAR LTD, 1976. Assessment Report *#061624 by C.J. Riley and D.F. Schutz.
ELDORADO NUCLEAR LTD, 1976. Assessment Report *#090152 by C.J. Riley.
GEOLOGICAL SURVEY OF CANADA Paper 77A, p. 33-37.
GORDEY, S.P. AND MAKEPEACE, A.J., 2003. Yukon Digital Geology, version 2.0, S.P. Gordey and A.J. Makepeace (comp); Geological Survey of Canada, Open File 1749 and Yukon Geological Survey, Open File 2003-9 (D).
HESCA RESOURCES LTD, 1977. Assessment Report *#090280 by C.K. Ikona.
HUNT, J., 2005. The geology and genesis of iron oxide-copper-gold mineralisation associated with Wernecke Breccia, Yukon Canada, PhD thesis, James Cook University, Australia, 2 volumes, 120 p.
MINERAL INDUSTRY REPORT 1975, p. 65; 1976 p. 130-132; 1977, p. 46, 48; 1978, p. 17-18.
NEW MINEX RESOURCES LTD, Oct/76. Assessment Report #090172 by C.K. Ikona.
NEW MINEX RESOURCES LTD, Jan/78. Assessment Report #090301 by A.E. Nevin.
THORKELSON, D.J. AND WALLACE, C.A., 2000. Geology and mineral occurrences of the Slats Creek, Fairchild Lake and ¿Dolores Creek¿ areas, Wernecke Mountains, Yukon (106D/16, 106C/13, 106C/14). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Bulletin 10, 73 p.
WERNECKE JOINT VENTURE, Mar/76. Assessment Report #090099 by A.R. Archer.
WERNECKE JOINT VENTURE, Jul/78. Assessment Report #090311 by A.R. Archer.
WERNECKE JOINT VENTURE, 1978. Assessment Report *#090371 by A.R. Archer.
WERNECKE JOINT VENTURE, Jan/82. Assessment Report #090766 by W.D. Eaton.
YUKON EXPLORATION AND GEOLOGY 1987, Vol. 2, p. 41-50.
Staked in Jul-Oct/75 by Wernecke JV (Chevron Can L & Aquitaine) as Wernecke cl (Y97944), which were explored with mapping, sampling and a radiometric survey in 1975; mapping and radiometric surveys in 1976 by Eldorado Nuclear L under a brief option: ground and airborne radiometric surveys in 1978 and chip sampling and prospecting in 1981. In 1982, Eldorado changed its name to Eldor Res Ltd.
Fringe staking in 1976 included QUA & Bon cl (YA1594) to the southwest in Feb by Hesca Res L, which performed geochem sampling and trenching in 1977; Kid cl (YA1881) to the northwest in March and Rin cl (YA14799) to the west in Dec by Rio Alto EL, which conducted a track-etch radon survey in 1976 and optioned its claims to Marline O (Alberta) in 1977, which explored by airborne radiometric surveys in 1978; and MTR cl (YA1546) to the northeast in Feb by Sioux Mountain ML (west half) and New Minex Res L (east half). New Minex explored with geochem and radiometric surveys and hand trenching in 1976 and 1977.
Capsule Geology
The region is underlain by a metamorphosed and altered sequence of Early Proterozoic Wernecke Supergroup clastic and carbonate rocks (Fairchild Lake Group, Quartet Group and Gillespie Lake Group, from oldest to youngest) that are intruded by Early to Middle Proterozoic mafic sills and dykes, and cut by Middle Proterozoic Wernecke Breccia. To the east, Wernecke Supergroup rocks are unconformably overlain by Middle Proterozoic Pinguicula Group rocks. According to Thorkelson (2000), Wernecke Breccia development is best modeled as a set of hydrothermal and/or phreatic breccias; brecciation being caused by explosive expanson of volatile-rich fluids. Hunt (2005) attributed Wernecke Breccia formation to periodic over-pressuring of dominantly basinal fluids, which lead to repeated brecciation of host strata and mineral precipitation.
The claims contain at least five separate brannerite occurrences near the margin of Wernecke Breccia bodies that cut Quartet Group limy argillite. The best zone, situated at the north end of the mountain, consists of coarse disseminations with minor thorite and uranothorite in a 150- by 10-m zone of bleached, silicified argillite at the breccia contact. Gold, barium and copper are associated with the radioactive zone in minor quantities. Age dating by Wernecke JV gave a date of 745 Ma (U-Pb) from the brannerite, significantly younger than either the Wernecke Breccia or Wernecke Supergroup rocks, and likely reflects later remobilization of uranium by a thermal or tectonic event.
Hand specimens from the zone returned assays up to 1.12% U3O8 and 1.2 g/t Au but the average grade is less than 0.03% U3O8 and trace Au. Two uranium and one copper-uranium geochem anomalies were reported by New Minex while Hesca also obtained anomalous uranium values.
Prospecting by Rio Alto located a small area of mineralization assaying 0.07% U3O8.
References
ELDORADO NUCLEAR LTD, Sep/76. Assessment Report #061618 by C.J. Riley.
ELDORADO NUCLEAR LTD, 1976. Assessment Report *#061624 by C.J. Riley and D.F. Schutz.
ELDORADO NUCLEAR LTD, 1976. Assessment Report *#090152 by C.J. Riley.
GEOLOGICAL SURVEY OF CANADA Paper 77A, p. 33-37.
GORDEY, S.P. AND MAKEPEACE, A.J., 2003. Yukon Digital Geology, version 2.0, S.P. Gordey and A.J. Makepeace (comp); Geological Survey of Canada, Open File 1749 and Yukon Geological Survey, Open File 2003-9 (D).
HESCA RESOURCES LTD, 1977. Assessment Report *#090280 by C.K. Ikona.
HUNT, J., 2005. The geology and genesis of iron oxide-copper-gold mineralisation associated with Wernecke Breccia, Yukon Canada, PhD thesis, James Cook University, Australia, 2 volumes, 120 p.
MINERAL INDUSTRY REPORT 1975, p. 65; 1976 p. 130-132; 1977, p. 46, 48; 1978, p. 17-18.
NEW MINEX RESOURCES LTD, Oct/76. Assessment Report #090172 by C.K. Ikona.
NEW MINEX RESOURCES LTD, Jan/78. Assessment Report #090301 by A.E. Nevin.
THORKELSON, D.J. AND WALLACE, C.A., 2000. Geology and mineral occurrences of the Slats Creek, Fairchild Lake and ¿Dolores Creek¿ areas, Wernecke Mountains, Yukon (106D/16, 106C/13, 106C/14). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Bulletin 10, 73 p.
WERNECKE JOINT VENTURE, Mar/76. Assessment Report #090099 by A.R. Archer.
WERNECKE JOINT VENTURE, Jul/78. Assessment Report #090311 by A.R. Archer.
WERNECKE JOINT VENTURE, 1978. Assessment Report *#090371 by A.R. Archer.
WERNECKE JOINT VENTURE, Jan/82. Assessment Report #090766 by W.D. Eaton.
YUKON EXPLORATION AND GEOLOGY 1987, Vol. 2, p. 41-50.
Location Map
Last Updated: Aug 31, 2018
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1981 | Geochemistry: Rock | Chip sampling. |
| 1981 | Other: Prospecting | |
| 1978 | Airborne Geophysics: Radiometric | |
| 1978 | Geochemistry: Soil | |
| 1978 | Geology: Bedrock Mapping | |
| 1978 | Ground Geophysics: Radiometric Survey | |
| 1978 | Other: Prospecting | |
| 1977 | Geochemistry: Soil | |
| 1977 | Geology: Bedrock Mapping | |
| 1977 | Ground Geophysics: Scintillometer | Ground scintillometer survey. Also Track Etch Radon Survey. |
| 1977 | Trenching: Hand | |
| 1976 | Geochemistry: Soil | |
| 1976 | Geology: Bedrock Mapping | |
| 1976 | Ground Geophysics | Track Etch Radon Survey. |
| 1976 | Trenching: Hand | |
| 1975 | Airborne Geophysics: Radiometric | |
| 1975 | Geochemistry: Soil | |
| 1975 | Geology: Bedrock Mapping | |
| 1975 | Ground Geophysics: Radiometric Survey |
Regional Geology - Terrane
Group: Ancestral North America
Affinity: W Laurentia
Name: North America - platformal strata
Realm: Laurentia
Regional Geology - Bedrock
Supergroup: Wernecke
Group/Suite: Fairchild Lake
Formation:
Member:
Terrane: Laurentia
Period Max: Statherian
Age Max: 1800 MA
Period Min: Statherian
Age Min: 1600 MA
Rock Major: siltstone, sandstone
Rock Minor:
Reference: Thorkelson et al. (2002) - YGS GM 2002-2
Geological Unit (1M): lPFL
Geological Unit (250K): lPFL1
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 095646 | 2007 | 2007 Geological, Geochemical and Geophysical Report on the Werneckes Project | Diamond - Drilling, Rock - Geochemistry, Silt - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Regional Bedrock Mapping - Geology, Magnetics - Ground Geophysics, Scintillometer - Ground Geophysics, Prospecting - Other, Backhoe - Trenching, Hand - Trenching, Handblast - Trenching | 28 | 6537.96 |
| 094954 | 2006 | Mineral Exploration Report for the Curie Property, North Central, Yukon Territory | Electromagnetic - Airborne Geophysics, Gamma-Ray Spectrometry - Airborne Geophysics, Magnetic - Airborne Geophysics, Rock - Geochemistry, Silt - Geochemistry, Soil - Geochemistry, Bedrock Mapping - Geology, Gravity Survey - Ground Geophysics, Research/Summarize - Pre-existing Data, Backhoe - Trenching | ||
| 094956 | 2006 | 2006 Geological, Geochemical and Geophysical Report on the Werneckes Project | Reverse Circulation - Airborne Geophysics, Rock - Geochemistry, Soil - Geochemistry, Bedrock Mapping - Geology, Scintillometer - Ground Geophysics, Prospecting - Other | ||
| 062055 | 1980 | Report on Geology an Exploration of the Bonnet Plume Basin Yukon Territory | Diamond - Drilling, Bedrock Mapping - Geology, Regional Bedrock Mapping - Geology, Environmental Assessment/Impact - Studies, Resource Estimate - Studies | 53 | 10700 |
| 090371 | 1978 | Report on Detailed Radiometric Grid Survey and Airborne Radiometric Survey | Gamma-Ray Spectrometry - Airborne Geophysics, Gamma-ray Spectrometry - Ground Geophysics | ||
| 090311 | 1978 | Assessment Report on Orthophoto Mapping Wernecke 1-82 Claims | Orthophoto - Airphotography | ||
| 090152 | 1976 | Report on Geology and Detailed Radiometric Survey Wernecke 1-82 | Bedrock Mapping - Geology, Gamma-ray Spectrometry - Ground Geophysics | ||
| 090099 | 1976 | Report on Soil Geochemistry, Geology and Radiometric Surveys | Gamma-Ray Spectrometry - Airborne Geophysics, Rock - Geochemistry, Soil - Geochemistry, Bedrock Mapping - Geology, Gamma-ray Spectrometry - Ground Geophysics | ||
| 061624 | 1976 | Report on Geology and Detailed Radiometric Survey Wernecke 1-82 | Gamma-Ray Spectrometry - Airborne Geophysics, Gamma-ray Spectrometry - Ground Geophysics | ||
| 061572 | 1976 | [1976 U/Pb Assay Results for Igor, Gnuckles, and Otis Claims in the Wernecke Range] | Silt - Geochemistry |
