General Information
Secondary Commodities: copper, gold, zinc, silver, uranium, lead
Deposit Type(s): Skarn Pb-Zn
Location(s): 64.4268 N, -134.867080 W
NTS Mapsheet(s): 106D07
Location Comments: Based on showing from AR# 090084.
Hand Samples Available at YGS: No
Last Reviewed: May 23, 2019
Capsule
Last Updated: May 23, 2019Work History
Staked as A cl 1-4 (Y95025) and cl 5-16 (Y96477) by M. Cloutier in Aug/74. The claims were optioned to Dawson Range Mines Ltd which carried out a small reconnaissance program. In 1975 the claims were optioned to Thunder Creek Mines Ltd which reportedly carried out surface exploration, trenching and diamond drilling in 1975 and 76.
Capsule Geology
The occurrence is located on the east side of Braine Creek, a tributary of the Beaver River approximately 10 km west of Mount Williams in north-central Yukon. The area was regionally mapped by L. Green (1972) of the Geological Survey of Canada in 1961 as part of a helicopter-supported party known as Operation Ogilvie. Roots remapped topographic map sheets 106D/8 and 106D/7 (East half) to the east in 1990.
The area is underlain by massive dolostone assigned to the Lower Proterozoic Gillespie Lake Group which have been intruded by a large gabbro sill assigned by Gordey to the Middle Proterozoic Hart River Sills assemblage. The occurrence consists of galena, sphalerite, chalcopyrite, pyrite and pyrrhotite mineralization which occurs in massive bands up to 13 cm-wide within a tremolite skarn zone measuring 1.7 m wide. The zone has developed in Gillespie Lake Group dolostone near the contact of a large Middle Proterozoic gabbro sill and can be traced in float for a length of 90 m before it is obscured by overburden.
A chip sample across a 1.7 m wide outcrop in a creek bed assayed 7.1% lead, 2.6% zinc, 54.9 g/t silver, 0.4% copper and 0.1 g/t gold, while a selected specimen of the best mineralization assayed 20.6% lead, 14.4% zinc, 154.3 g/t silver, 0.6% copper and 0.17 g/t gold. Examination of mineralized specimens during early 1976 was reported to have detected uranium.
The Canadian Mines Handbook 1976-77 reports that Thunder Creek carried out exploration work in 1975 and 76 but no assessment records can be located.
Staked as A cl 1-4 (Y95025) and cl 5-16 (Y96477) by M. Cloutier in Aug/74. The claims were optioned to Dawson Range Mines Ltd which carried out a small reconnaissance program. In 1975 the claims were optioned to Thunder Creek Mines Ltd which reportedly carried out surface exploration, trenching and diamond drilling in 1975 and 76.
Capsule Geology
The occurrence is located on the east side of Braine Creek, a tributary of the Beaver River approximately 10 km west of Mount Williams in north-central Yukon. The area was regionally mapped by L. Green (1972) of the Geological Survey of Canada in 1961 as part of a helicopter-supported party known as Operation Ogilvie. Roots remapped topographic map sheets 106D/8 and 106D/7 (East half) to the east in 1990.
The area is underlain by massive dolostone assigned to the Lower Proterozoic Gillespie Lake Group which have been intruded by a large gabbro sill assigned by Gordey to the Middle Proterozoic Hart River Sills assemblage. The occurrence consists of galena, sphalerite, chalcopyrite, pyrite and pyrrhotite mineralization which occurs in massive bands up to 13 cm-wide within a tremolite skarn zone measuring 1.7 m wide. The zone has developed in Gillespie Lake Group dolostone near the contact of a large Middle Proterozoic gabbro sill and can be traced in float for a length of 90 m before it is obscured by overburden.
A chip sample across a 1.7 m wide outcrop in a creek bed assayed 7.1% lead, 2.6% zinc, 54.9 g/t silver, 0.4% copper and 0.1 g/t gold, while a selected specimen of the best mineralization assayed 20.6% lead, 14.4% zinc, 154.3 g/t silver, 0.6% copper and 0.17 g/t gold. Examination of mineralized specimens during early 1976 was reported to have detected uranium.
The Canadian Mines Handbook 1976-77 reports that Thunder Creek carried out exploration work in 1975 and 76 but no assessment records can be located.
Location Map
Last Updated: May 23, 2019
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1976 | Drilling: Diamond | Based on Canadian Handbook of Mines, no records found. |
| 1976 | Trenching | Based on Canadian Handbook of Mines, no records found. |
| 1975 | Drilling: Diamond | Based on Canadian Handbook of Mines, no records found. |
| 1975 | Trenching | Based on Canadian Handbook of Mines, no records found. |
| 1974 | Other | |
| 1974 | Other |
Regional Geology - Terrane
Group: Ancestral North America
Affinity: W Laurentia
Name: North America - platformal strata
Realm: Laurentia
Regional Geology - Bedrock
Supergroup:
Group/Suite:
Formation: Hart River
Member:
Terrane: Laurentia
Period Max: Ectasian
Age Max: 1385 MA
Period Min: Ectasian
Age Min: 1375 MA
Rock Major: diorite/gabbro/sills/dykes
Rock Minor:
Reference: Roots (1990) - YGS OF 1990-3
Geological Unit (1M): mPH
Geological Unit (250K): mPH2
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 090084 | 1974 | Report on the ""A"" Claim Group | Rock - Geochemistry, Prospecting - Other |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| ARMC008073 | Geochemical values map - Reef project - Castle Ridge detail area - Figure 9 | Geochemical Map | |
| ARMC008074 | Castle Ridge geochem map - Reef project - Figure 21 | Geochemical Map | |
| ARMC008088 | Castle Ridge detail area map - 1976 | Geoscience Map (General) | |
| ARMC008089 | Castle Ridge detail area map - 1974 | Geoscience Map (General) | |
| ARMC007820 | Map - Reef project - Figure 19 | Geochemical Map | |
| ARMC013528 | Property submission and report on the "A" claim group, Braine Creek area | Report | |
| ARMC011912 | Geology compilation map - Castle Ridge detail area - Reef project - Figure 8 | Geoscience Map (Geological - Bedrock) |
| Citations |
|---|
| Canadian Mines Handbook, 1976-77, p. 315. |
| 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). |
| Green, L.H. 1972. Geology of Nash Creek, Larsen Creek and Dawson Map-Areas, Yukon Territory. Geological Survey of Canada, Memoir 364. |
| Mineral Industry Report - 1975, p. 61. |
| Roots, C., 1990. Geology of 106D/8 and 106D/7 (east half) map area; Exploration and Geological Services Division, Yukon, Indian and Northern Affairs, Canada, Open File 1990-3. |
| Whitehorse Star, 14/Apr/76, p. 31. |
