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Occurrence Details


Occurrence Number
116A 013
Occurrence Name
Rimrock
Occurrence Type
Hard-rock
Status
Prospect


General Information

Secondary Commodities: antimony, gold, zinc, silver, lead
Deposit Type(s): Sediment hosted Sedimentary Exhalative Zn-Pb-Ag (Sedex)
Location(s): 64.234720 N, -137.9750 W
NTS Mapsheet(s): 116A04
Location Comments: .5 Kilometres
Hand Samples Available at YGS: No

Capsule

Work History

Conwest Exploration Company Ltd staked the north showing (occurrence B) as Rimrock cl (87938) in Oct/66 and carried out mapping and sampling in 1967. It was partially restaked as RN cl (Y37972) by Hart River Mines Ltd in Jul/69.
The Aussie Syndicate (Silver Standard Mines Ltd and Asarco Inc) staked both occurrences within Aussie cl 1-62 (Y90131) in Sep/74 and conducted mapping, geochem and rock sampling in 1974 and 1975.
Both occurrences were restaked as Lake cl 1-30 (YA53738) in Sep/80 by Anaconda Canada Exploration Ltd, which performed detailed mapping and sampling in 1981.
The two occurrences were restaked as part of Lorrie cl 1-81 (YB17909) in Sep/88 by Walhala Explorations Ltd, which staked Jamie cl 1-4 (YB17905) approximately 5 km to the southwest. The company completed short prospecting and geological mapping programs in 1988 and 1989.
In Jun/90, Walhala sold the Lorrie and Jamie claims to Tombstone Explorations Co. Ltd which prospected, mapped, soil sampled and added Lorrie cl 101-124 (YB31145) Jamie cl 5-215 (YB30680) in June and July1990. Placer Dome Inc optioned the property in 1991 and explored with geological mapping and geochemical sampling before relinquishing the option in Dec/91.
Noranda Exploration Co. Ltd tied on Cubb claims (YB38493) to the southeast in Oct/90.
In Oct and Nov/96 International Kodiak Resources Inc staked OB cl 1-568 (YC02987) and Wow cl 1-104 (YC04804) on the southern boundary of the remaining Lorrie and Jamie claims. The Wow claims encompassed the southern most occurrence (occurrence A). In Mar/98 the company added Pay Dirt cl 1-30 (YC06683) to the east. The company completed soil and silt sampling in 1997 and prospecting and rock sampling in 1998.

Capsule Geology

Gold, silver and copper occur in quartz-sulphide veins which cut Upper Cabrian and Ordovician, calcareous argillite assigned to the Rabbitkettle assemblage, near the margin of a small mid-Cretaceous syenite stock. There are two showings, north (occurrence B) and south (occurrence A).
The north vein contains pyrrhotite, pyrite, sphalerite, galena and chalcopyrite.
The south showing consists of several subparallel concordant veins averaging 0.6 to 0.9 m wide which have been traced for a length of 460 m. The veins dip 45 degrees, parallel to bedding, and strike west-northwest. They are well mineralized with (in decreasing order of abundance) pyrite, pyrrhotite, arsenopyrite, galena, sphalerite, jamesonite and chalcopyrite. The veins consist of a quartz-carbonate core surrounded by a sulphide envelope. Early chip samples averaged 2 to 10% Pb and 69 g/t Ag with minor values in the other metals. Three 1981 chip samples averaged approximately 350 g/t Ag, 5.7% Pb, 0.9% Zn, 0.2% Cu, 0.14% Sb and trace gold over 0.6 m for a length of about 100 m along one of the veins. Hornfelsed black argillite found in this area in 1990 contained stratabound galena and sphalerite which assayed up to 9.08% Pb, 11.8% Zn and 691.4 g/t Ag.
Placer Dome discovered a third mineralized area (Birdie and Bindie zones) about 1 km southeast of the south vein. This occurrence consists of quartz-sulphide lenses in a silicified, carbonatized shear zone in calc-silicate hornfels, which appears to be traceable beneath overburden for at least 3 km. Specimens of quartz-sulphide material from the Birdie zone contained up to 13.9 g/t Au. Samples of talus fines taken downhill from the Bindie zone returned numerous values in excess of 1000 ppb Au.
International Kodiak's exploration work was focused at relocating and re-sampling both the Rimrock south occurrence and the Birdie/Bindie zones. Grab samples of sulphide pod material from the Rimrock south occurrence (occurrence A) returned high values for silver of up to 229.5 ppm with accompanying high lead, zinc, arsenic and antimony. Quartz sulphide material from the Birdie/Bindis zon assayed as high as 1760 ppb Au. Elsewhere on the property, the company identified 4 areas of anomalous Au, As, Sb, Hg and Bi values. These areas were followed up with detailed grid soil sampling.

Location Map

Last Updated: Sep 14, 2018

Work History

Year Work Type Comment
1998 Geology: Bedrock Mapping
1998 Other: Prospecting
1998 Trenching: Hand
1998 Geochemistry: Rock
1997 Geochemistry: Soil Also silt sampling.
1991 Geochemistry: Rock
1991 Geochemistry: Soil
1991 Geology: Bedrock Mapping
1989 Geochemistry: Rock Also a few soil samples.
1989 Geology: Bedrock Mapping
1989 Other: Prospecting
1981 Geochemistry: Rock
1981 Geology: Bedrock Mapping
1974 Geochemistry: Soil Also rock sampling.
1974 Geology: Bedrock Mapping
1967 Geochemistry: Rock
1967 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:
Formation: Rabbitkettle
Member:
Terrane: Laurentia
Period Max: Cambrian
Age Max: 500 MA
Period Min: Ordovician
Age Min: 472 MA
Rock Major: chert/siltstone/phyllite/limestone/conglo
Rock Minor: flow/breccia/tuff/slate
Reference: Murphy (1997, unpub.) - geological interpretation of Larsen Creek geophysical survey
Geological Unit (1M): COR
Geological Unit (250K): COR1

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
096411 2013 Airborne Geophysical Interpretation of the Mike Lake Property Electromagnetic Airborne Geophysics, Gama-Ray Spectrometry Airborne Geophysics, Magnetic Airborne Geophysics
095119 2008 Assessment Report Describing Geology, Mineralization and Diamond Drilling at the Mike Lake Property Diamond Drilling, Detailed Bedrock Mapping Geology, Magnetics Ground Geophysics, Resistivity Ground Geophysics, Prospecting Other, Environmental Assessment/Impact Studies 68 10004
095029 2007 Assessment Report Describing the Geology, Mineralization and Diamond Drilling of the Mike Lake Property Diamond Drilling, Bedrock Mapping Geology, Prospecting Other 9 1822
094614 2005 Assessment Report Describing the Geology, Geophysics and Diamond Drilling of the Mike Lake Property Diamond Drilling, Rock Geochemistry, Soil Geochemistry, Detailed Bedrock Mapping Geology, EM Ground Geophysics, IP Ground Geophysics, Magnetics Ground Geophysics 19 2462.55
094574 2004 Assessment Report Describing the Geology, Geochemistry and Prospecting at the Mike Lake Property Soil Geochemistry, Bedrock Mapping Geology, Prospecting Other, Data Compilation Pre-existing Data
094510 2004 Assessment Report Describing the Geology, Geochemistry and Prospecting at the Mike Lake Property Soil Geochemistry, Bedrock Mapping Geology, Prospecting Other
093967 1998 Geological, Geochemical and Geophysical Report on the Oki-Doki Project Claims Silt Geochemistry, Soil Geochemistry, IP Ground Geophysics, Magnetics Ground Geophysics
093922 1998 Assessment Report 1998 Geolgoical, Geochemical and Geophysical Program Mike Lake Property Magnetic Airborne Geophysics, Rock Geochemistry, Soil Geochemistry, Bedrock Mapping Geology, IP Ground Geophysics, Handblast Trenching
093768 1997 Geological, Geophysical and Geochemical Assessment Report on the Oki-Doki Project Claims Gama-Ray Spectrometry Airborne Geophysics, Magnetic Airborne Geophysics, Rock Geochemistry, Silt Geochemistry, Soil Geochemistry, Regional Bedrock Mapping Geology, Prospecting Other, Process/Interpret Pre-existing Data
093010 1991 Geological and Geochemical Report on the LORRIE Property Rock Geochemistry, Soil Geochemistry, Detailed Bedrock Mapping Geology, Prospecting Other
092912 1990 Report on the 1990 Geological and Geochemical Exploration Work on the Lorrie Property Rock Geochemistry, Silt Geochemistry, Soil Geochemistry, Detailed Bedrock Mapping Geology, Prospecting Other
090917 1981 Report for Assessment Lake 1-30 Claims Rock Geochemistry, Detailed Bedrock Mapping Geology, Data Compilation Pre-existing Data

Related References

Number Title Page(s) Document Type
092912 Report on the 1990 Geological and Geochemical Exploration Work on the Lorrie Property Assessment Report
093967 Geological, Geochemical and Geophysical Report on the Oki-Doki Project Claims Assessment Report
092817 Geological Mapping and Geochemical Sampling on the Lorrie Claims Assessment Report
093961 Geological, Geochemical and Geophysical Report on the Oki-Doki Project Claims Assessment Report
093768 Geological, Geophysical and Geochemical Assessment Report on the Oki-Doki Project Claims Assessment Report
090917 Report for Assessment Lake 1-30 Claims Assessment Report
093010 Geological and Geochemical Report on the LORRIE Property Assessment Report
BROCK000007 Geochemical survey maps - Mike Lake Intrusion, Lorrie Lake Intrusion, and Anvil Lake Intrusion Geochemical Map
BROCK000008 Sample location and rock geochemistry maps - Au - Lorrie Lake, Mike Lake, and Anvil Lake areas Geochemical Map
Citations
Green, L.H., 1972. Geology of Nash Creek, Larsen Creek and Dawson map areas, Yukon Territory. Geological Survey of Canada, Memoir 364, 157 p.

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