General Information
Secondary Commodities: chromium, copper, platinum, nickel, palladium, gold
Deposit Type(s): Ultramafic Mafic Podiform Chromite
Location(s): 63.021110 N, -138.349720 W
NTS Mapsheet(s): 115O01
Location Comments: 1 Kilometres. Occurrence lies within area withdrawn from staking as part of Selkirk First Nation Land Claims Agreement.
Hand Samples Available at YGS: No
Capsule
Work History
Staked as PY cl 1-64 (YA55186) in Apr/81 by M. Barker.
Restaked as BTT cl 1-32 (YA87943) in May/86 by Doron Explorations Inc. In Jan/87 R. McPhee surrounded the claim block with Irish cl 1-150 (YA88503), Rest cl 1-104 (YA89204) and Kips cl 1-112 (YA88812). Both properties were optioned by M.J. Brady who explored with geophysical and geochemical surveys in 1987. The Rest claims were transferred to Brady in Apr/89. R. McPhee performed a VLF-EM survey and soil sampling on the Irish claims in Jul/90.
Restaked as Stock cl 1-32 (YB53597) in Apr/95 by Bostock Holdings Ltd. The company staked the adjoining Bos cl 1-32 (YB53565) at the same time. In Jul/96 Bostock Holdings collected two lines of soil samples (28 samples) and 10 chip samples on the northwest side of the Stock claims.
In Jul/1997 this occurrence and the surrounding area was withdrawn from staking as part of the Selkirk First Nation’s Final Land Claims Agreement. The Bos and Stock claims lapsed in Nov/1997.
GEOLOGY
The occurrence area is located on the north side of the Stewart River and encompasses the area surrounding Pyroxene Mountain in west central Yukon. J. Ryan and S. Gordey of the Geological Survey of Canada remapped the Stewart River map sheet area (NTS 115N&O) in the early 2000's (including the north side of the Yukon River) and released a geology map in 2004 and a geological compilation in 2005. The compilation map differed slightly from the earlier map due to revisions related to newly disclosed age dating results.
Based on the geological mapping completed by Ryan and Gordey the occurrence is underlain by Late Triassic Pyroxene Mountain medium to coarse-grained, massive equigranular pyroxenite. An Early Jurassic granodiorite and quartz monzonite stock intrudes the ultramafic rocks along their north and northwest borders
The original claims were staked on reports published by the Geological Survey of Canada describing platinum occurring in nearby placers.
The 1987 soil geochemical surveys outlined two 1 000 to1 200 m long anomalies. The first anomaly was centred approximately 2.25 km northwest of the occurrence location (around Irish claim #49) while the second anomaly was centred approximately 2.0 km to the southwest (around Irish claim #15). The anomalies appear to coincide with the margins of the stock and contain up to 280 ppb platinum, 150 ppb palladium and 110 ppb gold. A specimen of friable ultramafic rock collected from within the northern anomaly assayed 15.2 g/t gold and 280 platinum.
R. McPhee’s 1990 geochemical and VLF-EM surveys covered the northerly of the two (1987) soil anomalies. Except for one palladium assay, soil sampling failed to confirm earlier results. A VLF-EM conductor coincided with a zone of high iron values in overlying soil (2.37-4.06% iron).
Bostock Holdings focused their rock and soil sampling program over the northern anomaly where in 1987, the 15.2 g/t gold rock sample was collected. Rock samples returned values up to 39 ppb gold, 55 ppb platinum and 40 ppb palladium.. A soil sample collected from the site of the 1987 rock sample returned 2 ppb gold.
REFERENCES
BOSTOCK, H.S., 1937. Geological Survey of Canada, Memoir 218.
BOSTOCK HOLDINGS LTD, Dec/96. Assessment Report #093529 by M.A. Stammers.
BRADY, M.J., Jan/88. Assessment Report #092088 by D.H. Waugh.
DORON EXPLORATIONS INC., Dec/87. Prospectus Report #062285 by J.E. Wallis.
GORDEY, S.P.AND RYAN , J.J. 2005. Geology, Stewart River Area (115N, 115 O and part of 115J), Yukon Territory; Geological Survey of Canada, Open File 4970, scale 1:250 000.
RYAN, J.J. AND GORDEY, S.P., 2002: Bedrock geology of Yukon-Tanana terrane in southern Stewart River map area, Yukon Territory; Geological Survey of Canada, Current Research 2002-A1, 11 p.
Ryan, J.J. ET AL., 2003: Update on bedrock geological mapping of the Yukon-Tanana terrane, southern Stewart River map area, Yukon Territory; Geological Survey of Canada, Current Research 2003-A9, 7 p.
Ryan, J.J. AND GORDEY, S.P., 2004; Geology Stewart River Area (Parts of 115N/1,2,7,8 and 115O/2- 12), Yukon Territory; Geological Survey of Canada, Open File 4641, scale 1:100 000.
WEACO RESOURCES LTD, May/91. Assessment Report #093007 by B.G. Richards.
YUKON EXPLORATION 1987, p. 286, 294.
YUKON EXPLORATION AND GEOLOGY, 1981, p. 224.
Staked as PY cl 1-64 (YA55186) in Apr/81 by M. Barker.
Restaked as BTT cl 1-32 (YA87943) in May/86 by Doron Explorations Inc. In Jan/87 R. McPhee surrounded the claim block with Irish cl 1-150 (YA88503), Rest cl 1-104 (YA89204) and Kips cl 1-112 (YA88812). Both properties were optioned by M.J. Brady who explored with geophysical and geochemical surveys in 1987. The Rest claims were transferred to Brady in Apr/89. R. McPhee performed a VLF-EM survey and soil sampling on the Irish claims in Jul/90.
Restaked as Stock cl 1-32 (YB53597) in Apr/95 by Bostock Holdings Ltd. The company staked the adjoining Bos cl 1-32 (YB53565) at the same time. In Jul/96 Bostock Holdings collected two lines of soil samples (28 samples) and 10 chip samples on the northwest side of the Stock claims.
In Jul/1997 this occurrence and the surrounding area was withdrawn from staking as part of the Selkirk First Nation’s Final Land Claims Agreement. The Bos and Stock claims lapsed in Nov/1997.
GEOLOGY
The occurrence area is located on the north side of the Stewart River and encompasses the area surrounding Pyroxene Mountain in west central Yukon. J. Ryan and S. Gordey of the Geological Survey of Canada remapped the Stewart River map sheet area (NTS 115N&O) in the early 2000's (including the north side of the Yukon River) and released a geology map in 2004 and a geological compilation in 2005. The compilation map differed slightly from the earlier map due to revisions related to newly disclosed age dating results.
Based on the geological mapping completed by Ryan and Gordey the occurrence is underlain by Late Triassic Pyroxene Mountain medium to coarse-grained, massive equigranular pyroxenite. An Early Jurassic granodiorite and quartz monzonite stock intrudes the ultramafic rocks along their north and northwest borders
The original claims were staked on reports published by the Geological Survey of Canada describing platinum occurring in nearby placers.
The 1987 soil geochemical surveys outlined two 1 000 to1 200 m long anomalies. The first anomaly was centred approximately 2.25 km northwest of the occurrence location (around Irish claim #49) while the second anomaly was centred approximately 2.0 km to the southwest (around Irish claim #15). The anomalies appear to coincide with the margins of the stock and contain up to 280 ppb platinum, 150 ppb palladium and 110 ppb gold. A specimen of friable ultramafic rock collected from within the northern anomaly assayed 15.2 g/t gold and 280 platinum.
R. McPhee’s 1990 geochemical and VLF-EM surveys covered the northerly of the two (1987) soil anomalies. Except for one palladium assay, soil sampling failed to confirm earlier results. A VLF-EM conductor coincided with a zone of high iron values in overlying soil (2.37-4.06% iron).
Bostock Holdings focused their rock and soil sampling program over the northern anomaly where in 1987, the 15.2 g/t gold rock sample was collected. Rock samples returned values up to 39 ppb gold, 55 ppb platinum and 40 ppb palladium.. A soil sample collected from the site of the 1987 rock sample returned 2 ppb gold.
REFERENCES
BOSTOCK, H.S., 1937. Geological Survey of Canada, Memoir 218.
BOSTOCK HOLDINGS LTD, Dec/96. Assessment Report #093529 by M.A. Stammers.
BRADY, M.J., Jan/88. Assessment Report #092088 by D.H. Waugh.
DORON EXPLORATIONS INC., Dec/87. Prospectus Report #062285 by J.E. Wallis.
GORDEY, S.P.
RYAN, J.J. AND GORDEY, S.P., 2002: Bedrock geology of Yukon-Tanana terrane in southern Stewart River map area, Yukon Territory; Geological Survey of Canada, Current Research 2002-A1, 11 p.
Ryan, J.J. ET AL., 2003: Update on bedrock geological mapping of the Yukon-Tanana terrane, southern Stewart River map area, Yukon Territory; Geological Survey of Canada, Current Research 2003-A9, 7 p.
Ryan, J.J. AND GORDEY, S.P., 2004; Geology Stewart River Area (Parts of 115N/1,2,7,8 and 115O/2- 12), Yukon Territory; Geological Survey of Canada, Open File 4641, scale 1:100 000.
WEACO RESOURCES LTD, May/91. Assessment Report #093007 by B.G. Richards.
YUKON EXPLORATION 1987, p. 286, 294.
YUKON EXPLORATION AND GEOLOGY, 1981, p. 224.
Location Map
Last Updated: Jul 25, 2018
Work History
| Year | Work Type | Comment |
|---|---|---|
| 1996 | Geochemistry: Rock | |
| 1996 | Geochemistry: Soil | |
| 1990 | Geochemistry: Soil | |
| 1990 | Ground Geophysics: EM | Also VLF survey. |
| 1987 | Geochemistry: Soil | |
| 1987 | Ground Geophysics: Magnetics |
Regional Geology - Terrane
Group: Intermontane
Affinity: W Laurentia
Name: Yukon-Tanana
Realm: peri-Laurentian
Regional Geology - Bedrock
Supergroup:
Group/Suite: Stikine
Formation:
Member:
Terrane: Stikinia
Period Max: Triassic
Age Max: 228.69999695 MA
Period Min: Triassic
Age Min: 199.60000610 MA
Rock Major: clinopyroxenite, hornblendite, hornblende pyroxenite, gabbro
Rock Minor:
Reference: Ryan et al. (2013) - GSC CGM 116
Geological Unit (1M): LTrS
Geological Unit (250K): LTrgS
Assessment Reports that overlap occurrence
| Report Number | Year | Title | Worktypes | Holes Drilled | Meters Drilled |
|---|---|---|---|---|---|
| 092088 | 1987 | A Preliminary Geochemical Geophysical Report on the IRISH REST KIPS BTT Claims | Rock - Geochemistry, Soil - Geochemistry, Magnetics - Ground Geophysics, Petrographic - Lab Work/Physical Studies, Line Cutting - Other, Landsat - Remote Sensing | ||
| 062285 | 1986 | Preliminary Field Examination Report on the Pyroxene Mtn. Claims | Cursory Property Visit - Other |
Related References
| Number | Title | Page(s) | Document Type |
|---|---|---|---|
| 2003-9(D) | Yukon Digital Geology (version 2) | Open File (Geological - Bedrock) | |
| ARMC016527 | Coloured geology map - 115O/1 - Pyroxene Mountain | Geoscience Map (Geological - Bedrock) |
| Citations |
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