General Information
Deposit Type(s): Iron Oxide Breccias & Veins (Wernecke Breccias)
Location(s): 64.896670 N, -133.444170 W
NTS Mapsheet(s): 106C14
Location Comments: .5 Kilometres
Hand Samples Available at YGS: No
Capsule
Work History
Thorkelson and Wallace (1995) reported this showing as Minfile Occurrence #106C 095.
Discovered during geological mapping program by Thorkelson and Wallace (1995). J. Hajek staked Bloom cl 1-38 (YB43576) to the north and west in Sep/94. The next year Hajek optioned the claims to West Lake Ltd which carried out a trenching and prospecting program later in the summer. Hajek staked the occurrence as BL cl 55-62 (YB65749) in Jul/96.
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 occurrence consists of quartz-dolomite-pyrite and chalcopyrite veins associated with nearby zones of Wernecke Breccia. Two zones of veining about 5 m wide within the Fairchild Lake Group occur near the base of the cirque headwall. Abundant vein float suggests that the veins may also crop out higher on the cirque walls. The two best assays from vein material were 1.8 % copper, 0.42 gm/t gold; and 0.02 % copper, 0.02 gm/t gold.
References
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).
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.
THORKELSON, D.J. and WALLACE, C.A., 1995. Geology and mineral occurrences of the Dolores Creek map area (106C/14), Wernecke Mountains, northeastern Yukon. In: Yukon Exploration and Geology, 1994. Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, p. 19-30.
THORKELSON, D.J. and WALLACE, C.A., 1998. Geological map of Dolores Creek map area, Wernecke Mountains, Yukon (106C/14). Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada. Geoscience Map 1998-11, scale 1:50 000.
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.
WEST LAKE LTD, Mar/96. Assessment Report #093510 by J.H. Hajek.
Thorkelson and Wallace (1995) reported this showing as Minfile Occurrence #106C 095.
Discovered during geological mapping program by Thorkelson and Wallace (1995). J. Hajek staked Bloom cl 1-38 (YB43576) to the north and west in Sep/94. The next year Hajek optioned the claims to West Lake Ltd which carried out a trenching and prospecting program later in the summer. Hajek staked the occurrence as BL cl 55-62 (YB65749) in Jul/96.
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 occurrence consists of quartz-dolomite-pyrite and chalcopyrite veins associated with nearby zones of Wernecke Breccia. Two zones of veining about 5 m wide within the Fairchild Lake Group occur near the base of the cirque headwall. Abundant vein float suggests that the veins may also crop out higher on the cirque walls. The two best assays from vein material were 1.8 % copper, 0.42 gm/t gold; and 0.02 % copper, 0.02 gm/t gold.
References
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).
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.
THORKELSON, D.J. and WALLACE, C.A., 1995. Geology and mineral occurrences of the Dolores Creek map area (106C/14), Wernecke Mountains, northeastern Yukon. In: Yukon Exploration and Geology, 1994. Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, p. 19-30.
THORKELSON, D.J. and WALLACE, C.A., 1998. Geological map of Dolores Creek map area, Wernecke Mountains, Yukon (106C/14). Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada. Geoscience Map 1998-11, scale 1:50 000.
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.
WEST LAKE LTD, Mar/96. Assessment Report #093510 by J.H. Hajek.
Location Map
Last Updated: Sep 15, 2011
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1995 | Other | |
| 1995 | Trenching | |
| 1994 | Geology: Bedrock Mapping | Occurrence discovered during government mapping program. |
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/dolostone
Rock Minor:
Reference: Thorkelson & Wallace (1998) - YGS GM 1998-11
Geological Unit (1M): lPFL
Geological Unit (250K): lPFL1
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 095634 | 2007 | YUP February Internal Technical Report, Season 2007 Describing Mapping, Prospecting and Diamond Drilling at the Lumina Property | Gamma-Ray Spectrometry - Airborne Geophysics, Diamond - Drilling, Drill Core - Geochemistry, Rock - Geochemistry, Detailed Bedrock Mapping - Geology, Regional Bedrock Mapping - Geology, Scintillometer - Ground Geophysics, Prospecting - Other | 15 | 4367.20 |
| 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 |
| 094953 | 2006 | Assessment Report Describing Airborne Geophysics, Mapping, Prospecting and Diamond Drilling | Gamma-Ray Spectrometry - Airborne Geophysics, Magnetic - Airborne Geophysics, Diamond - Drilling, Drill Core - Geochemistry, Bedrock Mapping - Geology, Prospecting - Other | 22 | 2602.89 |
| 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 | ||
| 093510 | 1995 | 1995 Assessment Report Glacial Lake Properties | Rock - Geochemistry, Soil - Geochemistry, Bedrock Mapping - Geology, Magnetics - Ground Geophysics, Line Cutting - Other, Prospecting - Other, Backhoe - Trenching | ||
| 091456 | 1983 | Exploration, 1982, Gold, Silver and Uranium Deposits, Glacier Lake Region | Rock - Geochemistry, Silt - Geochemistry, Detailed Bedrock Mapping - Geology, EM - Ground Geophysics, Scintillometer - Ground Geophysics, Petrographic - Lab Work/Physical Studies, Prospecting - Other, Hand - Trenching | ||
| 019048 | 1968 | Engineering Report, Year 1968 on the Mammoth Copper Property | Air Strip - Development, Surface, Winter Road - Development, Surface, Silt - Geochemistry, Detailed Bedrock Mapping - Geology, Prospecting - Other, Backhoe - Trenching |
