General Information
Secondary Commodities: barite
Deposit Type(s): Sediment hosted Sedimentary Exhalative Zn-Pb-Ag (Sedex)
Location(s): 61.946670 N, -131.080280 W
NTS Mapsheet(s): 105G14
Location Comments: 1 Kilometres
Hand Samples Available at YGS: No
Capsule
Work History
Staked as Dwonk cl (YA25521) in Sep/77 by a joint venture between Cyprus Anvil and Hudson's Bay O & GL, which explored with mapping and geochem sampling in 1977, mag and EM surveys in 1978, and 5 holes (891 m) in 1980.
Capsule Geology
The area is underlain by Devono-Mississippian Earn Group clastic rocks that were deposited in Selwyn Basin, a continental margin basin with thick sequences of black carbonaceous shales deposited in euxinic conditions. Deposition of the Earn Group marks the subsidence of the entire miogeocline, local uplift and faulting that caused the formation of localized secondary basins. Sedex mineralization occurs in close association with extensional tectonism.
Cream-weathering, massive, bedded barite up to 10 m wide with interbedded bands of pyrite up to 10 cm wide occur in an east-trending sequence of Devonian-Mississippian Earn Group clastic rocks in an area of extensive overburden. The 'black clastic' assemblage includes chert pebble conglomerate, black shale, chert and turbidite. Several EM conductors were outlined but magnetic and geochemical response were negative, and no base metal sulphides were intersected in the drilling.
References
BOND, J.D., MURPHY, D.C., COLPRON, M., GORDEY, S.P., PLOUFFE, A., ROOTS, C.F., LIPOVSKY, P.S., STRONGHILL, G., AND ABBOTT, J.G., 2002. Digital compilation of bedrock geology and till geochemistry, northern Finlayson Lake map area, Southeastern Yukon (105G), Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File Report, 2002-7(D) and Geological Survey of Canada Open File 4243.
CYPRUS ANVIL MINING CORP., May/78. Assessment Report #090327 by W. Roberts.
CYPRUS ANVIL MINING CORPORATION, 1980. Assessment Report *#090654 by L.C. Pigage
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).
MINERAL INDUSTRY REPORT 1977, p. 88.
MURPHY, D.C. AND PIERCEY, S.J., 1999. Geological map of parts of Finlayson Lake (105G/7, 8 and parts of 1, 2, and 9) and Frances Lake (parts of 105H/5 and 12) map areas, southeastern Yukon (1:100 000-scale). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File 1999-4.
MURPHY, D.C., COLPRON, M., GORDEY, S.P., ROOTS, C.F., ABBOTT, G., AND LIPOVSKY, P.S., 2001. Preliminary bedrock geological map of northern Finlayson Lake area (NTS 105 G) Yukon Territory (1:100 000 scale). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File 2001-33.
MURPHY, D.C., COLPRON, M., ROOTS, C.F., GORDEY, S.P. AND ABBOTT, J.G., 2002. Finlayson Lake Targeted Geoscience Initiative (southeastern Yukon) , Part 1: Bedrock geology. In: Yukon Exploration and Geology 2001, D.S. Emond, L.H. Weston and L.L. Lewis (eds.), Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, p. 189-207.
PIERCEY, S.J., HUNT, J.A. and MURPHY, D.C., 1999. Lithogeochemistry of meta-volcanic rocks from Yukon-Tanana Terrane, Finlayson Lake region, Yukon: Preliminary results. In: Yukon Exploration and Geology 1998, C.F. Roots and D.S. Emond (eds.), Exploration and Geological Services Division, Indian and Northern Affairs Canada, p.125-138.
YUKON GEOLOGY AND EXPLORATION 1979-80, p. 182.
Staked as Dwonk cl (YA25521) in Sep/77 by a joint venture between Cyprus Anvil and Hudson's Bay O & GL, which explored with mapping and geochem sampling in 1977, mag and EM surveys in 1978, and 5 holes (891 m) in 1980.
Capsule Geology
The area is underlain by Devono-Mississippian Earn Group clastic rocks that were deposited in Selwyn Basin, a continental margin basin with thick sequences of black carbonaceous shales deposited in euxinic conditions. Deposition of the Earn Group marks the subsidence of the entire miogeocline, local uplift and faulting that caused the formation of localized secondary basins. Sedex mineralization occurs in close association with extensional tectonism.
Cream-weathering, massive, bedded barite up to 10 m wide with interbedded bands of pyrite up to 10 cm wide occur in an east-trending sequence of Devonian-Mississippian Earn Group clastic rocks in an area of extensive overburden. The 'black clastic' assemblage includes chert pebble conglomerate, black shale, chert and turbidite. Several EM conductors were outlined but magnetic and geochemical response were negative, and no base metal sulphides were intersected in the drilling.
References
BOND, J.D., MURPHY, D.C., COLPRON, M., GORDEY, S.P., PLOUFFE, A., ROOTS, C.F., LIPOVSKY, P.S., STRONGHILL, G., AND ABBOTT, J.G., 2002. Digital compilation of bedrock geology and till geochemistry, northern Finlayson Lake map area, Southeastern Yukon (105G), Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File Report, 2002-7(D) and Geological Survey of Canada Open File 4243.
CYPRUS ANVIL MINING CORP., May/78. Assessment Report #090327 by W. Roberts.
CYPRUS ANVIL MINING CORPORATION, 1980. Assessment Report *#090654 by L.C. Pigage
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).
MINERAL INDUSTRY REPORT 1977, p. 88.
MURPHY, D.C. AND PIERCEY, S.J., 1999. Geological map of parts of Finlayson Lake (105G/7, 8 and parts of 1, 2, and 9) and Frances Lake (parts of 105H/5 and 12) map areas, southeastern Yukon (1:100 000-scale). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File 1999-4.
MURPHY, D.C., COLPRON, M., GORDEY, S.P., ROOTS, C.F., ABBOTT, G., AND LIPOVSKY, P.S., 2001. Preliminary bedrock geological map of northern Finlayson Lake area (NTS 105 G) Yukon Territory (1:100 000 scale). Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, Open File 2001-33.
MURPHY, D.C., COLPRON, M., ROOTS, C.F., GORDEY, S.P. AND ABBOTT, J.G., 2002. Finlayson Lake Targeted Geoscience Initiative (southeastern Yukon) , Part 1: Bedrock geology. In: Yukon Exploration and Geology 2001, D.S. Emond, L.H. Weston and L.L. Lewis (eds.), Exploration and Geological Services Division, Yukon Region, Indian and Northern Affairs Canada, p. 189-207.
PIERCEY, S.J., HUNT, J.A. and MURPHY, D.C., 1999. Lithogeochemistry of meta-volcanic rocks from Yukon-Tanana Terrane, Finlayson Lake region, Yukon: Preliminary results. In: Yukon Exploration and Geology 1998, C.F. Roots and D.S. Emond (eds.), Exploration and Geological Services Division, Indian and Northern Affairs Canada, p.125-138.
YUKON GEOLOGY AND EXPLORATION 1979-80, p. 182.
Location Map
Last Updated: Jun 20, 2018
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1980 | Drilling: Diamond | Five holes, 891 m. |
| 1978 | Ground Geophysics: Magnetics | Also EM survey. |
| 1977 | Geochemistry: Soil | |
| 1977 | Geology: Bedrock Mapping |
Regional Geology - Terrane
Group: Ancestral North America
Affinity: W Laurentia
Name: North America - basinal strata
Realm: Laurentia
Regional Geology - Bedrock
Supergroup:
Group/Suite: Earn
Formation:
Member:
Terrane: Laurentia
Period Max: Devonian
Age Max: 385 MA
Period Min: Carboniferous
Age Min: 345 MA
Rock Major: argillite, siltstone
Rock Minor: sandstone, conglomerate
Reference: Murphy et al. (2001) - YGS OF 2001-33
Geological Unit (1M): DME
Geological Unit (250K): DME1
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 090327 | 1978 | Geological, Geochemical and Geophysical Report on the Dwonk Group | Soil - Geochemistry, EM - Ground Geophysics, Magnetics - Ground Geophysics, Line Cutting - Other |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| ARMC003361 | Claim map - Pelmac project - Gonzo claims | Geoscience Map (General) | |
| ARMC003581 | Summary of exploration and development work - 1978 - Dwonk claims | Report | |
| ARMC003588 | Summary of exploration and development work - 1978 - Anvil claim block, North Anvil Range - Urn, MM, JJ, DD, Igle, Howru, Bojo, Dwonk claims | Report | |
| ARMC003589 | Reports for Howru, Dwonk, Chzerpnough and MM properties | Report | |
| ARMC009098 | Dwonk groupMagnetometer values map - MacMillan project - Dwonk group | Geophysical Map | |
| ARMC010235 | Outcrop and station location map - Dwonk and Gonzo claims - Figure 3 | Geoscience Map (General) | |
| ARMC009092 | Geochemical values map - Cu, Pb, Zn - MacMillan project - Dwonk claims - Figure 5 | Geochemical Map | |
| ARMC009093 | Vertical cross-section - Dwonk claims - Figure 6 | Geoscience Map (General) | |
| ARMC009094 | Induced polarization survey map - Line 110-E dip pole - dip pole array - Dwonk grid | Geophysical Map | |
| ARMC009095 | Claim map - MacMillan project - Dwonk claims | Geoscience Map (General) | |
| ARMC009096 | Magnetometer profiles map - MacMillan project - Dwonk group | Geophysical Map | |
| ARMC009097 | Horizontal loop E.M. survey profiles map - MacMillan project - Dwonk group | Geophysical Map | |
| ARMC009099 | Horizontal loop E.M. survey values map - MacMillan project - Dwonk group | Geophysical Map | |
| ARMC009100 | Geology map - MacMillan project - Dwonk group | Geoscience Map (Geological - Bedrock) | |
| ARMC014119 | Report - Dwonk claims | Report | |
| ARMC014115 | Sketch map of Dwonk claims | Geoscience Map (General) | |
| ARMC011988 | Area regional compilation - Geological map - Dwonk & Gonzo claims - Fig. 4 | Geoscience Map (Geological - Bedrock) | |
| ARMC014120 | Cyprus Anvil geochem report - Dwonk claims | Miscellaneous Company Documents | |
| ARMC014118 | Geological and drilling report - Dwonk claim groups - Watson Lake mining district - Yukon Territory - Field work completed from May 26-July 29 1980 | Report |
| Citations |
|---|
Drill Core at YGS Core Library
| Number | Property | Year Drilled | Core Size | Photos | Data |
|---|---|---|---|---|---|
| 80-DW-01 | Dwonk | 1980 | BQ | 6 | 1 |
| 80-DW-02 | Dwonk | 1980 | NQ-BQ | 18 | 1 |
| 80-DW-03 | Dwonk | 1980 | NQ-BQ | 28 | 1 |
| 80-DW-05 | Dwonk | 1980 | NQ-BQ | 2 | 2 |
| 80-DW-08 | Dwonk | 1980 | NQ-BQ | 0 | 0 |
