General Information
Secondary Commodities: copper, tungsten, silver
Aliases: Ann, Bear, Canyon, Cop, Crisp, Discovery, Pay
Deposit Type(s): Skarn Cu
Location(s): 61.283990 N, -136.964320 W
NTS Mapsheet(s): 115H07
Location Comments: Based on Assessment Report locations
Hand Samples Available at YGS: Yes
Capsule
Work History
Discovered and staked in 1907 and extensively prospected and trenched in 1909. The history is obscure until May/44, when it was restaked as Myrtle Discovery, etc cl (4401) by G. Patten. Restaked in Jul/46 as Pan cl (56210) by A. Champagne, probably for the North Star Pros. Synd. Restaked by H. Perrin in Nov/53 as Canyon cl (69737), which were optioned to Hudson Bay M & S in Jan/54.
In 1953-54, Hudson Bay M & S staked and optioned 69 claims (Ann-66826 and Hoop 67964, etc) in Dec/53, which covered Hopkins Lake and the two small lakes immediately to the north. Following EM surveys, Hudson Bay drilled 6 holes (630.0 m) in 1954, of which 4 holes were drilled through the lake ice.
Restaked as Hope cl (75230) in Sep/60 by W.S. Reber; as Brian cl (77439) in Mar/62 by Kerr Addison ML; as Loon cl (85092) in Jun/63 by L. Nault and Al cl (Y10015) in Jul/67 by L. Saunders and partners.
The Duck and Crisp cl (Y24855) were staked in May/68 by A. Hume and J. Janisiw and transferred in 1969 to Giltana Copper Corp. L, which did some trenching in 1969-71, added the Bear cl (Y50046) in 1970 and Pay cl (Y66546) in 1971, and drilled two packsack holes (29.9 m) on the Pay group in 1972.
The adjoining A-Lake cl (Y24710) of M. Smith, also staked in May/68, were trenched in 1968 and 1969. Bill Kuhn staked the AX cl (Y75539) on the southwest side in Jun/73, and V. Scheck, etc added AX cl (Y92575) on the northwest side in Feb/75.
Restaked as Cop cl (YA50702) in Jun/80 by D. Lampert and transferred to Bolero ML, which performed mapping. T. Yardley tied on Side cl (YA60286) to the northeast in Jun/81.
Restaked as HOP cl (YB25531) in Mar & Jun/89 by Casau EL which conducted a magnetometer survey and mapping in 1990. In Aug/95 the remaining Hop and Acme claims were transferred to J.C. Stephen.
Capsule Geology
This occurrence is the original Giltana Lake occurrence described by the GSC. The nearby lake was later misidentified as Hopkins on maps. Skarns are found in limy sections of quartz-biotite schist near or along contacts with intrusive dykes and stocks of variable composition. The host unit is described in Johnson and Timmerman (1994a) as the Aishihik Metamorphic Suite.
Mineralization consists of magnetite and chalcopyrite with minor molybdenite, scheelite and precious metals. Individual mineralized skarns are lensoid and rarely exceed a meter in width. Some of the intrusive rocks contain disseminated molybdenite.
The conductors drilled by Hudson Bay were found to be caused by graphitic material. The best intersections in the 1972 drilling were 0.6% Cu, 0.01% W from 8.2 to 10.4 m in Hole 1, 0.5% Cu, and 0.01% W from 0 to 3.7 m in Hole 2.
Mineralization is also present in quartz veins, which cut the skarn. A channel sample of one quartz vein assayed 18.1% Cu, and 117 ppm Ag.
In 1990, Casau located north-trending epithermal breccia zones up to 10 m wide. Samples from the breccias returned values up to 560 ppb Au, 665 ppm Cu and 256 ppm As.
Discovered and staked in 1907 and extensively prospected and trenched in 1909. The history is obscure until May/44, when it was restaked as Myrtle Discovery, etc cl (4401) by G. Patten. Restaked in Jul/46 as Pan cl (56210) by A. Champagne, probably for the North Star Pros. Synd. Restaked by H. Perrin in Nov/53 as Canyon cl (69737), which were optioned to Hudson Bay M & S in Jan/54.
In 1953-54, Hudson Bay M & S staked and optioned 69 claims (Ann-66826 and Hoop 67964, etc) in Dec/53, which covered Hopkins Lake and the two small lakes immediately to the north. Following EM surveys, Hudson Bay drilled 6 holes (630.0 m) in 1954, of which 4 holes were drilled through the lake ice.
Restaked as Hope cl (75230) in Sep/60 by W.S. Reber; as Brian cl (77439) in Mar/62 by Kerr Addison ML; as Loon cl (85092) in Jun/63 by L. Nault and Al cl (Y10015) in Jul/67 by L. Saunders and partners.
The Duck and Crisp cl (Y24855) were staked in May/68 by A. Hume and J. Janisiw and transferred in 1969 to Giltana Copper Corp. L, which did some trenching in 1969-71, added the Bear cl (Y50046) in 1970 and Pay cl (Y66546) in 1971, and drilled two packsack holes (29.9 m) on the Pay group in 1972.
The adjoining A-Lake cl (Y24710) of M. Smith, also staked in May/68, were trenched in 1968 and 1969. Bill Kuhn staked the AX cl (Y75539) on the southwest side in Jun/73, and V. Scheck, etc added AX cl (Y92575) on the northwest side in Feb/75.
Restaked as Cop cl (YA50702) in Jun/80 by D. Lampert and transferred to Bolero ML, which performed mapping. T. Yardley tied on Side cl (YA60286) to the northeast in Jun/81.
Restaked as HOP cl (YB25531) in Mar & Jun/89 by Casau EL which conducted a magnetometer survey and mapping in 1990. In Aug/95 the remaining Hop and Acme claims were transferred to J.C. Stephen.
Capsule Geology
This occurrence is the original Giltana Lake occurrence described by the GSC. The nearby lake was later misidentified as Hopkins on maps. Skarns are found in limy sections of quartz-biotite schist near or along contacts with intrusive dykes and stocks of variable composition. The host unit is described in Johnson and Timmerman (1994a) as the Aishihik Metamorphic Suite.
Mineralization consists of magnetite and chalcopyrite with minor molybdenite, scheelite and precious metals. Individual mineralized skarns are lensoid and rarely exceed a meter in width. Some of the intrusive rocks contain disseminated molybdenite.
The conductors drilled by Hudson Bay were found to be caused by graphitic material. The best intersections in the 1972 drilling were 0.6% Cu, 0.01% W from 8.2 to 10.4 m in Hole 1, 0.5% Cu, and 0.01% W from 0 to 3.7 m in Hole 2.
Mineralization is also present in quartz veins, which cut the skarn. A channel sample of one quartz vein assayed 18.1% Cu, and 117 ppm Ag.
In 1990, Casau located north-trending epithermal breccia zones up to 10 m wide. Samples from the breccias returned values up to 560 ppb Au, 665 ppm Cu and 256 ppm As.
Location Map
Last Updated: Jun 7, 2019
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1990 | Geology: Bedrock Mapping | |
| 1990 | Ground Geophysics: Magnetics | |
| 1990 | Other: Prospecting | |
| 1981 | Geology: Bedrock Mapping | |
| 1980 | Geochemistry: Rock | |
| 1980 | Other: Prospecting | |
| 1972 | Drilling: Portable | Two holes, 29.9 m. |
| 1969 | Trenching: Mechanical | |
| 1954 | Drilling: Diamond | Six holes, 630 m. |
| 1954 | Ground Geophysics: EM | . |
| 1909 | Other: Prospecting | |
| 1909 | Trenching: Hand |
Regional Geology - Terrane
Group: Intermontane
Affinity: W Laurentia
Name: Yukon-Tanana
Realm: peri-Laurentian
Regional Geology - Bedrock
Supergroup:
Group/Suite: Snowcap
Formation:
Member:
Terrane: Yukon-Tanana
Period Max: Ediacaran
Age Max: 635 MA
Period Min: Devonian
Age Min: 375 MA
Rock Major: marble
Rock Minor:
Reference: Johnston & Timmerman (1994) - YGS OF 1994-2(G)
Geological Unit (1M): PDS
Geological Unit (250K): PDS2
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 096583 | 2013 | Air Photos, Access and Heritage Studies, Geochemical Sampling, Prospecting, Geological Mapping and Core Re-Logging at the Hopper Property | Orthophoto - Airphotography, Rock - Geochemistry, Silt - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Prospecting - Other, Heritage/Archeological - Studies | ||
| 092885 | 1990 | Report on Additional Geological Mapping and Preliminary Magnetometer Survey | Bedrock Mapping - Geology, Magnetics - Ground Geophysics | ||
| 092857 | 1990 | Preliminary Geological Report on the Hop 75-102 Quartz Claims | Bedrock Mapping - Geology, Prospecting - Other | ||
| 090884 | 1980 | Report on Cop Group | Rock - Geochemistry, Prospecting - Other |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| ARMC006613 | Correspondence Re: Hopkins Lake | Miscellaneous Company Documents | |
| ARMC016651 | Geochemical results map - 115H/7 - Hopkins Lake | Geochemical Map |
| Citations |
|---|
| CANADIAN MINING JOURNAL, Apr/47, p. 275. |
| GEOLOGICAL SURVEY OF CANADA Information Circular No. 5, p. 18. |
| GEOLOGICAL SURVEY OF CANADA Memoir 5, p. 57-58. |
| JOHNSTON, S.T. and TIMMERMAN, J.R., 1994a. Geology of the Aishihik Lake and Hopkins Lake Areas (115 H/6,7), southwest Yukon. In: Yukon Exploration and Geology 1993, Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, p. 93-110. |
| JOHNSTON, S.T. and TIMMERMAN, J.R., 1994b. Geological map of the Aishihik Lake map area, southwest Yukon (115 H/6). Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, Open File 1994-1(G). |
| JOHNSTON, S.T. and TIMMERMAN, J.R., 1994c. Geological map of the Hopkins Lake map area, southwest Yukon (115 H/7). Exploration and Geological Services Division, Yukon, Indian and Northern Affairs Canada, Open File 1994-2(G). |
| YUKON EXPLORATION AND GEOLOGY 1981, p. 213. |
| YUKON GEOLOGY AND EXPLORATION 1979-80, p. 98, 102. |
