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Occurrence Details


Occurrence Number
115I 049
Occurrence Name
Caribou Creek
Occurrence Type
Hard-rock
Status
Past Producer


General Information

Primary Commodities: gold
Secondary Commodities: silver
Deposit Type(s): Vein Au-Quartz
Location(s): 62.2580 N, -137.1910 W
NTS Mapsheet(s): 115I06
Location Comments: .5 Kilometres
Hand Samples Available at YGS: Yes

Capsule

Work History

Staked as Dark Moth cl (39046) in April 1937 by W. Teare and optioned in 1938 to T.C. Richards and E. Keobke, who built a 107 m aerial tramway and a 1.8 tonne gravity fed stamp mill. The mill briefly produced 12.7 tonnes of ore from an opencut and shipped one brick containing 2,613 g gold with 20% silver. The milling equipment was subsequently moved to the nearby Laforma property (MINFILE occurrence 115I 054) in the winter of 1938-1939.

Re-staked as Hope cl 1 (69842) in October 1954 by P.F. Guder, who carried out hand trenching. Guder staked Greenstone cl 1-5 (90465) to the north in July 1964, before optioning the Hope claim to Peso Carmacks Gold Mines Ltd. in September 1964, which added Teare cl 1-44 (91122). Gruder added Greeenstone cl 6 (Y21094) to the north in September 1967; re-staked the Hope claims as Hope cl 1 (Y21249) in November 1967; optioned the Hope claim to R. Granger from 1969-1970; carried out hand trenching annually until 1974; staked Best cl 1-6 (Y25895) in September 1968; staked Hope cl 2 (Y76048) in July 1973; and carried out bulldozer trenching in 1978. The property was subsequently transferred to Guder Mining Exploration Ltd., which trenched in 1985.

The MJK cl 1-32 (Y78884) and MJK cl 33-44 (Y78916) were added to the immediate west in May 1974 by the Carmacks Syndicate (Castlemaine Exploration Ltd., Welcome North Mines Ltd., W.M. Bath Investments Ltd and Ventures West Capital Ltd.) and optioned to a joint venture between Western Mines Ltd, Cream Silver Mines Ltd and Belmoral Mines Ltd which carried out geological mapping, soil sampling and a magnetometer surveying later in the year. This area was re-staked as Cara cl 1-7 (YB08036) in August 1986 by G. Harris, who had earlier staked Greenstone cl 7-10 (YA92778) to the north in July 1985.

Doron Explorations Inc. surrounded the occurrence with Boo cl 1-66 (YB7740) in August 1987. The company also staked Boo cl 77-86 (YB07806) to the northeast, Boo cl 101-104 (YB07816) to the northwest and Boo cl 67-76 (YB08026) to the northeast at about the same time. Later in the year the company carried out bulldozer trenching on various claims. Doron optioned the Guder and Harris owned claims in 1988 and carried out geochemical sampling, geophysical surveying and cat trenching, followed by drilling of 23 holes (1,116.6 m) between the fall of 1988 and February 1989. In 1990, Sayre Development Inc. constructed and briefly operated a 50 tonnes per day mill on the property during an unsuccessful attempted to mine the open cut.

In July 1993, Harris and Associates blast trenched and sampled the Caribou vein and collected soil samples on the Cara, Best, Hope and various Boo claims. The road to the property was also upgraded. In December 1993, Harris staked May cl 1 and 3 (YB46564) to the northwest.

In September 1994, Doron Explorations Inc transferred the Boo cl 1-86 (YB07740) and 101-104 (YB07816) to B. Harris. In 1994, Dark Moth Mines Ltd drifted 100 m on the Caribou vein and carried out prospecting, geophysics and soil sampling on the surrounding claims. In 1996, Harris continued sampling the various veins in the area, constructed roads and test milled auriferous quartz breccia material. Between 1997 and 1999, Harris continued upgrading roads and sampling the open cut and underground workings.

In 2000, Midnight Mines Ltd (a Harris owned company) took over as operator on the project and extended the existing cut grid, prospected the gridded area and carried out an informal evaluation. The adit and drift were reportedly dewatered at that time and sampling of them and the open cut was carried out. Grid rehabilitation, upgrading and expansion of the road/trail network, prospecting, hand trenching and geochemical rock sampling were carried out in 2001 and 2002.

In 2006, Geotech Ltd. flew a magnetic and EM airborne geophysical over the Caribou Creek property for Bill Harris.

Regional & Property Geology

The occurrence is partly underlain by Yukon-Tanana Terrane (YTT). The rocks of the YTT in this region consist of Early Mississippian metamorphic rocks separated into meta-sedimentary and meta-igneous suites. The meta-sedimentary suite consists of micaceous quartz-feldspar gneiss, schist and quartzite. The meta-igneous package is comprised of biotite-hornblende feldspar gneiss and coarse-grained granodiorite orthogneiss with lesser amphibolite.

The YTT basement rocks are cut by numerous plutonic and volcanic events from the Mesozoic (Murray & Friend, 2018), including:
1. Early Jurassic Long Lake monzonite  and granodiorite plutonic suites;
2. Mid-Cretaceous Mount Nansen Suite andesite, dacite, tuffs and rhyolite;
3. Mid-Cretaceous Whitehorse granodiorite;
4. Late Cretaceous Prospector Mountain syenite;
5. Late Cretaceous Carmacks basalt; and,
6. Quartz feldspar and feldspar hornblende porphyry dykes and plugs.

Mineralization & Results

Coarse free gold is found in quartz veinlets and quartz-flooded breccia zones, near the remnant of a volcanic feeder possibly related to the Late Cretaceous Carmacks Group volcanics, which cut Carmacks Group Caribou Creek conglomerate and associated graphitic siltstone which are unique to the district (AR 094683). According to Murray & Friend (2018) and Carlson (1987) bedrock is believed to consist of monzonite assigned to the Early Jurassic Long Lake Suite and Mount Nansen andesite. A large mid-Cretaceous granitic pluton assigned to the Whitehorse Suite outcrops to the south.

Gold appears to be related to contacts between the volcanic feeder and the basal part of the graphite unit. The zone appears to trend northeast at the discovery showing, but the nine holes which intersected mineralization (88-1,9,10,11 and 12 and 89-1,2,3,4) outlined a 2.6 m thick zone which trends 340° and dips about 50° east. The best intersections assayed 95.76 g/t Au over 2.89 m and 101.6 g/t Au over 1.8 m (AR 093110).

Midnight Mines drifted on the Caribou vein, a 1-2 m wide quartz vein stockwork containing pockets of visible gold. The vein system occurs along a shear zone at the fault contact between graphitic siltstone and volcanic rocks. Approximately 147 tonnes of ore were extracted from the adit and stockpiled. A small pilot mill processed several tonnes of high grade ore, producing approximately 205 grams of gold.

Prospecting carried out from 2000 to 2002 was focused on 1 km by 1.5 km area northwest of the mill and found several float occurrences of brecciated graphitic siltstone, some of which contained visible gold, but was unsuccessful in locating the bedrock source of the float.

Rock geochemistry results from 2004 sampling of the adit returned up to 54.6 g/t Au with 6.3 g/t Ag over 1.7 m and 5.69 g/t Au with 1.5 g/t Ag over 1.2 m (AR 094683). 

Location Map

Last Updated: Dec 16, 2020

Work History

Year Work Type Comment
2006 Airborne Geophysics: Magnetic As well as an EM survey.
2004 Geochemistry: Rock
2004 Trenching: Hand
2002 Trenching: Mechanical
2002 Development, Surface: Access Road Expanded road network on property.
2002 Geochemistry: Rock
2001 Pre-existing Data: Process/Interpret Informal evaluation of assets located on property.
2001 Geochemistry: Rock
2001 Other: Prospecting
2001 Trenching: Hand
2000 Other: Prospecting Prospecting of adit.
2000 Development, Underground: Drifting/Raising De-watering of adit.
2000 Geochemistry: Rock
1999 Development, Surface: Access Road
1999 Geochemistry: Rock
1998 Development, Surface: Access Road
1998 Geochemistry: Rock
1997 Development, Surface: Access Road
1997 Geochemistry: Rock
1996 Development, Surface: Access Road Midnight Mines upgraded road to Caribou Creek vein.
1994 Development, Underground: Drifting/Raising Drifted 100 metres on the Caribou vein.
1994 Geochemistry: Soil
1994 Ground Geophysics: Magnetics Also VLF-EM survey.
1994 Geochemistry: Rock
1993 Development, Surface: Access Road Road was upgraded.
1993 Geochemistry: Rock
1993 Geochemistry: Soil
1993 Trenching: Mechanical Caribou vein was trenched and sampled.
1990 Development, Surface: Mill/Concentrator Construction Small mill constructed and operated for short time. Operation unsuccessful.
1990 Development, Underground: Drifting/Raising Unsucessful attempt to mine open cut.
1989 Drilling: Diamond Twenty-three holes, 1,116.6 m.
1988 Ground Geophysics: Magnetics Also VLF-EM survey.
1988 Other: Prospecting
1988 Trenching: Mechanical
1988 Geochemistry: Rock
1988 Geochemistry: Soil Also rock and silt sampling.
1988 Geology: Bedrock Mapping
1987 Trenching: Mechanical
1985 Trenching: Mechanical
1978 Trenching: Mechanical
1974 Geochemistry: Soil
1974 Geology: Bedrock Mapping
1974 Ground Geophysics: Magnetics
1974 Trenching: Hand
1973 Trenching: Hand Carried out between 1970 and 1973.
1954 Trenching: Hand
1938 Development, Surface: Tramway
1938 Development, Surface: Mill/Concentrator Construction Built stamp mill.
1938 Trenching: Mechanical Open cut produced 12.7 tonnes of ore.

Regional Geology - Terrane

Group: Intermontane
Affinity: W Laurentia
Name: Yukon-Tanana
Realm: peri-Laurentian


Regional Geology - Bedrock

Supergroup:
Group/Suite: Mount Nansen
Formation:
Member:
Terrane:
Period Max: Cretaceous
Age Max: 110 MA
Period Min: Cretaceous
Age Min: 90 MA
Rock Major: andesite/basalt/latite
Rock Minor: monzogabbro/diorite
Reference: Carlson (1987) - YGS OF 1987-2(G)
Geological Unit (1M): mKN
Geological Unit (250K): mKN

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
094627 2006 2006 Geophysical Assessment on the Caribou Creek Property Electromagnetic Airborne Geophysics, Magnetic Airborne Geophysics
094683 2004 Geological and Geochemical Assessment Report on the Caribou Creek Property Rock Geochemistry, Property Evaluation Other, Hand Trenching
094402 2001 2002 Assessment Report on the Caribou Creek Property Rock Geochemistry, Line Cutting Other, Property Evaluation Other, Prospecting Other, Hand Trenching
094394 2001 2001 Assessment Report on the Caribou Creek Property All Weather Road Development, Surface, Rock Geochemistry, Line Cutting Other, Prospecting Other, Data Compilation Pre-existing Data, Hand Trenching
094195 2000 2000 Assessment Report on the Caribou Creek Property Drifting/Raising Development, Underground, Rehabilitation Development, Underground, Rock Geochemistry, Line Cutting Other, Property Evaluation Other, Prospecting Other
093291 1994 Exploration Report on the CARIBOO Property and GLEN Claims All Weather Road Development, Surface, Mill/Concentrator Construction Development, Surface, Rock Geochemistry, Soil Geochemistry, EM Ground Geophysics, Magnetics Ground Geophysics, Line Cutting Other, Prospecting Other
093189 1994 Exploration Report on the Freegold Mountain Project Freegold Mountain Area Rock Geochemistry, Soil Geochemistry, Line Cutting Other, Prospecting Other, Mechanical Trenching
092648 1989 Exploration Report on the Caribou Creek Property All Weather Road Development, Surface, Rock Geochemistry, Silt Geochemistry, Soil Geochemistry, Bedrock Mapping Geology, EM Ground Geophysics, Magnetics Ground Geophysics, Line Cutting Other, Prospecting Other, Mechanical Trenching
061084 1974 Geological, Geochemical and Geophysical Report on the Mjk 1-32 Claims, Freegold Mountain Soil Geochemistry, Bedrock Mapping Geology, Magnetics Ground Geophysics, Line Cutting Other

Related References

Number Title Page(s) Document Type
093291 Exploration Report on the CARIBOO Property and GLEN Claims Assessment Report
ARMC012941 Geology map with legend - Guder Best group - Dawson Range Geoscience Map (Geological - Bedrock)
ARMC016627 Land and disposition and mineral deposits chart - Freegold - Big Creek area Geoscience Map (General)
ARMC016626 Geology and mineralization chart - Freegold - Big Creek area Geoscience Map (Geological - Bedrock)
094195 2000 Assessment Report on the Caribou Creek Property Assessment Report
094683 Geological and Geochemical Assessment Report on the Caribou Creek Property Assessment Report
093528 Exploration Report on the Glen,Castle,Rag, and Elephant Claims Assessment Report
093110 Report on Diamond Drilling Program CARIBOO CREEK Property Assessment Report
092648 Exploration Report on the Caribou Creek Property Assessment Report
061085 Geological , Geochemical and Geophysical Report on the MJK 33-44 Mineral Claims Freegold Mountain Assessment Report
1987-2(G) Geology of Mt. Nansen (115I/3) and Stoddart Creek (115I/6), Dawson Range, Central Yukon Open File (Geological - Bedrock)
1999-1(D) Yukon Digital Geology Open File (Geological - Bedrock)
061084 Geological, Geochemical and Geophysical Report on the Mjk 1-32 Claims, Freegold Mountain Assessment Report
094627 2006 Geophysical Assessment on the Caribou Creek Property Assessment Report
094402 2002 Assessment Report on the Caribou Creek Property Assessment Report
2018-2 Bedrock geological map of the Mount Freegold district, Dawson Range Open File (Geological - Bedrock)
094394 2001 Assessment Report on the Caribou Creek Property Assessment Report
093189 Exploration Report on the Freegold Mountain Project Freegold Mountain Area Assessment Report
Citations
Last Updated: Dec 16, 2020

Production

Date Commodity Amount Comment
1938-12-01 Au 2,700 grams Assessment report 093291, from 12 tons of had picked ore (252g/t Au).
1994-12-01 Au 170 grams Assessment report 093291, from 3 tons of ore (~56g /t Au).

Drill Core at YGS Core Library

Number Property Year Drilled Core Size Photos Data
CC-89-01 Caribou Creek 1989 HQ 6 3
CC-89-02 Caribou Creek 1989 HQ 12 3
CC-89-03 Caribou Creek 1989 HQ 2 3
CC-89-04 Caribou Creek 1989 HQ 8 2
88-09 Caribou Creek 1988 HQ 10 3
88-10 Caribou Creek 1988 HQ 6 3
88-11 Caribou Creek 1988 HQ 6 3
88-12 Caribou Creek 1988 HQ 8 3
DDH-1-90-88 Caribou Creek 1988 HQ 8 2
DDH-2-50-88 Caribou Creek 1988 HQ 6 2
DDH-3-50-88 Caribou Creek 1988 HQ 12 2
DDH-4-60-88 Caribou Creek 1988 HQ 8 2
DDH-5-90-88 Caribou Creek 1988 HQ 2 2

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