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Occurrence Details


Occurrence Number
105D 027
Occurrence Name
Becker-Cochran
Occurrence Type
Hard-rock
Status
Deposit


General Information

Primary Commodities: antimony
Secondary Commodities: gold, zinc, nickel, silver, copper, lead
Aliases: Yukon Antimony
Deposit Type(s): Vein & Disseminations Stibnite
Location(s): 60.184720 N, -135.2150 W
NTS Mapsheet(s): 105D03
Location Comments: .5 Kilometres
Hand Samples Available at YGS: Yes

Capsule

Work History

Originally staked sometime prior to 1907 as Paymaster, Jumbo, Queen of Sheba, etc cl, for which no claim records or history have been preserved. Restaked about 1915 by T. Becker and H. Cochran, who explored with limited hand trenching and drove a 30.5 m adit.

Restaked as Caroline, etc cl (19289) in 1940 by J. Cox and W. McAlister, who carried out hand trenching until 1948; restaked Caroline claim as Mac cl (57581) in Jul/49; and drove a 27.4 m adit in 1951. Restaked as Lum cl 2-8, Al cl 1-8, Ed cl 1-8 and Star cl 1-8 (82036) in Oct/62 by A. Gatey et al.

Restaked as Lum cl 1-8 (90251) in Jun/64 by Yukon Antimony Corporation Ltd, which carried out extensive trenching, geological mapping and bulk sampling in 1964; drove 3 adits totaling 431.2 m and drilled 566.9 m (about half underground) during 1965 and 1966; optioned the property to National Lead Company Ltd from June to Sep/70; and reorganized as International Mariner Resources Ltd in Feb/71.

Restaked as Pop cl 1-14 (Y75415) in May/73 and May/74 by E. Bergvinson and optioned briefly by Belmoral Mines Ltd in 1974, which carried out geological mapping and geochemical sampling before dropping the option. Con-Am Resources Ltd subsequently acquired the option and carried out geological mapping and EM surveying in 1976. In 1977 Con Am staked Bang cl 1-8 (YA8768) and Whiz cl 1-14 (YA19120), carried out road building, completed underground rehabilitation and sampling and drilled 7 holes (695.6 m).

In 1982, the claims were transferred to Berglynn Resources Ltd which carried out prospecting and sampling the following year. Berglynn surrounded the occurrence with Pop cl 15-104 (YA81468) in Mar/84 and carried out geological mapping and geochemical soil sampling and staked Pop cl 101 fr-116 fr (YA93378) to the north during 1984 and 1985. Walhalla Exploration Ltd staked Tech cl 1-18 (YA82362) contiguously to the northeast in Jun/84 and carried out EM geophysical surveying and staked Tech cl 19-21 (YA86013) in Oct/84. The Tech claims were transferred to Berglynn Resources in 1986, which carried out road construction, trenching, mapping and adit rehabilitation on their adjoining Pop claims.

Skukum Ventures Inc and Berglynn formed a joint venture to consolidate their holdings in the area and carried out geophysical surveying and drilled three holes (818.1 m) in 1987. Skukum Ventures was renamed Skukum Gold Inc in Mar/88 and Berglynn changed its name to Arkona Resources Inc in Mar/92. In 1994 Arkona formed a new joint venture with No. 276 Taurus Ventures Ltd, a private B.C. company, allowing it to increase its interest in the property and contiguious claims.

In 1995 the property was optioned to Omni Resources Inc and in Sep/96 Omni drilled one hole (887.6 m). Omni and Arkona carried out detailed geological mapping, contour soil sampling and prospecting in 1998. By 1999 Omni had earned a 60% interest in the property and purchased Taurus Ventures 10% interest, subsequent to Arkona transferring 100% ownership of the property to Omni on July 23/99.

In Nov/2000 Omni amalgamated with Trumpeter Yukon Gold Inc to form Tagish Lake Gold Corporation.

Capsule Geology

Mineralization occurs in lenses of quartz and barite within a 300 m long , 2.1 m wide shear zone in granite and mid-Cretaceous rusty weathering, blue-grey andesite porphyry flows and breccias (Hart, 1990) that is adjacent to a rhyolite dyke of the early Eocene Mount Skukum Volcanic Complex along most of its length. The shear zone is poorly exposed at surface and has weathered to a grey gangue containing red and yellow streaks and boulders of massive sulphide. The zone has been explored on surface for a length of about 30 m, where it strikes 050° and dips 75° southwest. Mineralization consists of stibnite with lesser amounts of pyrite and sphalerite and traces of realgar, orpiment, galena and tetrahedrite in a gangue of quartz and minor barite.

The showing has been explored with three adits. No. 1 was driven northwest on the vein for 158 m, at an elevation of 1,603 m and was locally well mineralized in the centre. No. 2 was collared 82.3 m to the southeast at the same elevation and was driven 41 m on a poorly mineralized vein. No. 3 was 46 m lower in elevation and consisted of 137 m of cross-cut and 94 m of poorly mineralized vein.

Grades announced by Yukon Antimony included 4.8% Sb, 0.6% Pb and 30.9 g/t Ag over an average width of 1.5 m for a length of 107 m in No. 1 adit. Probable reserves of 20 866 tonnes grading 3.6% Sb across an average width of 1.95 m were calculated in 1966. A 331 kg selected bulk sample from a surface pit tested in 1984 by the Mineral Processing Division, Department of Mines and Technical Surveys, assayed 11.21% Sb, 0.27% Zn, 0.024% Pb, 0.004% Cu, 0.12% Ni, 0.81% Fe, 5.64% S, 0.34 g/t Au, 1.02 g/t Ag and 73.7% insolubles. Single stage flotation produced a concentrate grading 60.7% Sb with a recovery of 92.8%.

In 1974, Belmoral estimated probable and possible reserves at 127,007 tonnes grading 4% Sb. The 1985 and later work was directed toward gold the gold potential of the occurrence. A few widely scattered soil values up to 1,500 ppb Au were obtained but assays from rocks and drill core were generally low.

Location Map

Last Updated: Jun 19, 2018

Work History

Year Work Type Comment
1998 Geochemistry: Soil Contour sampling.
1998 Geology: Bedrock Mapping
1998 Other: Prospecting
1996 Drilling: Diamond One hole, 887.6 m.
1987 Drilling: Diamond Three holes, 818.1 m.
1987 Ground Geophysics: EM Also VLF survey.
1986 Development, Surface: All Weather Road
1986 Geology: Bedrock Mapping
1986 Trenching
1986 Development, Underground: Rehabilitation
1985 Geology: Bedrock Mapping
1984 Geochemistry: Rock Further sampling.
1984 Geology: Detailed Bedrock Mapping
1984 Ground Geophysics: EM
1983 Other: Prospecting
1983 Geochemistry: Rock
1977 Development, Surface: All Weather Road
1977 Development, Underground: Rehabilitation
1977 Drilling: Diamond Seven holes, 584 m.
1977 Geochemistry: Rock Collected samples while rehabilitating underground workings.
1976 Geology: Bedrock Mapping
1976 Ground Geophysics: EM
1974 Geochemistry: Soil Also rock sampling.
1974 Geology: Bedrock Mapping
1966 Drilling: Diamond Unknown number of holes 566.9 m, some collared from underground. Completed 1965-66.
1964 Development, Underground: Drifting/Raising Dug 3 adits totaling 431.2 m.
1964 Geology: Bedrock Mapping
1964 Trenching
1951 Development, Underground: Drifting/Raising Dug a 27 m adit.
1940 Trenching: Hand
1915 Development, Underground: Drifting/Raising Dug a 30.5 m adit.
1915 Trenching: Hand

Regional Geology - Terrane

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


Regional Geology - Bedrock

Supergroup:
Group/Suite: Long Lake
Formation:
Member:
Terrane:
Period Max: Jurassic
Age Max: 192 MA
Period Min: Jurassic
Age Min: 178 MA
Rock Major: monzodiorite/quartz monzodiorite/hornblendite/granite/granodiorite
Rock Minor:
Reference: Hart & Radloff (1990) - YGS OF 1990-4
Geological Unit (1M): EJL
Geological Unit (250K): EJgL

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
095183 2009 Skukum Project Exploration Report for 2009 Geochemical and Geophysical Work Done on the Following Mineral Claims Char,Chief,Cl,Glee,Kuku,Lb,Mil,Mom,Omni,Pop,Raca,Sten Rock - Geochemistry, IP - Ground Geophysics, Resistivity - Ground Geophysics
094337 2002 Geological Structure and Alteration Study of the Pop,Mom,Chief,Glee,Tech,Berg,Sten,Mil Claims Detailed Bedrock Mapping - Geology, Petrographic - Lab Work/Physical Studies, Process/Interpret - Pre-existing Data
094028 1998 Geological and Geochemical Report on the Goddell/Carbon Hill Property (Mom,Pop,Berg,Sten,Tech,Mil and MB Claims) Rock - Geochemistry, Silt - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Prospecting - Other, Mechanical - Trenching
093631 1996 Diamond Drilling Assessment Report on the Pop 10 and 34 Mineral Claims Diamond - Drilling, Rock - Geochemistry 3 1397.81
092481 1988 Report on the Geology, Geophysics, Trenching and Diamond Drilling of the Pop Claims Diamond - Drilling, Drill Core - Geochemistry, Rock - Geochemistry, Detailed Bedrock Mapping - Geology, EM - Ground Geophysics, Mechanical - Trenching 16 4159
062286 1987 Summary Report on the Wheaton Gold Property Research/Summarize - Pre-existing Data
091931 1986 Geology and Geochemistry Adit Rehabilitation and Sampling, Backhoe Trenching and Sampling Rehabilitation - Development, Underground, Rock - Geochemistry, Soil - Geochemistry, Detailed Bedrock Mapping - Geology, Backhoe - Trenching
091820 1985 Soil Geochemical Survey on the Pop 15-70 and Tech 1-40 Mineral Claims Orthophoto - Airphotography, Soil - Geochemistry
091473 1983 Geochemical Report on the Pop Claim Group Rock - Geochemistry
061492 1976 Report on the Pop 1-14 Mineral Claims Property Evaluation - Other, Data Compilation - Pre-existing Data
061735 1975 Watson Coal Prospects, Report 1 Property Evaluation - Other, Data Compilation - Pre-existing Data
061183 1974 Report on the Pop 1-14 Mineral Claims Property Evaluation - Other, Research/Summarize - Pre-existing Data
061143 1974 Addendum Report Becker-Cochrane Antimony Deposit Data Compilation - Pre-existing Data, Process/Interpret - Pre-existing Data
018875 1964 [Engineering Evaluation Report on the Lum Claims] Rock - Geochemistry, Bulk Sample - Lab Work/Physical Studies, Hand - Trenching
092071 1964 Carbon Hill Antimony Deposits,Wheaton District of Yukon Antimony Corporation Ltd (N.P.L) Property Evaluation - Other
092050 1940 [Preliminary Account of the Present-Work of the Wheaton River Antimony Deposits] Tunnelling - Development, Underground, Hand - Trenching

Related References

Number Title Page(s) Document Type
ARMC016239 Geological map - No.1 & No. 2 adits - Becker-Cochran deposit Geoscience Map (Geological - Bedrock)
ARMC016242 Geological map - No.1 adits and No. 1 pit - Becker-Cochran deposit Geoscience Map (Geological - Bedrock)
ARMC016240 Geological map - No.3 adits - Becker-Cochran deposit Geoscience Map (Geological - Bedrock)
ARMC016241 Geological map - Upper trenches - Becker-Cochran deposit Geoscience Map (Geological - Bedrock)
ARMC014204 Sketch of Mac. No. 1 antimony showing (Becker-Cochrane) - Carbon Hill (E. side) Geoscience Map (General)
ARMC016243 DDH plan map - Becker-Cochran deposit Geoscience Map (General)
ARMC016244 DDH plan map - Becker-Cochran deposit Geoscience Map (General)
ARMC016425 DDH plan map - Becker-Cochran deposit Geoscience Map (General)
ARMC005307 Petrology and mineralogy report of the Yukon Sb, stibnite deposit Report
ARMC005296 Notes Re: P.A. Cox's antimony Miscellaneous Company Documents
ARMC005297 Notes Re: Becker Cochrane - Pop mineral claims Miscellaneous Company Documents
ARMC005298 Correspondence Re: Grizzly-Dorothy-Frankie Mcs - Old Becker/Cochrane stibnite property Miscellaneous Company Documents
ARMC005299 Property Information Form - Covering the location of Becker Cochrane-Porter claim groups News Release
ARMC005300 Memorandum Re: Cox Antimony prospect - Becker Creek Miscellaneous Company Documents
ARMC005301 Claim map showing Becker Creek, Antimony Creek, and Carbon Hill Geoscience Map (General)
ARMC005302 Plan map No. 2 - Cox Sb Property - Old Becker-Cochrane Group Geoscience Map (General)
ARMC005303 Correspondence Re: Antimony showing in the Wheaton district Miscellaneous Company Documents
ARMC005304 Preliminary report on the Cox antimony property, Becker Creek Report
1990-4(G) Geology of Whitehorse, Alligator Lake, Fenwick Creek Carcross and Part of Robinson Map Areas (105D/11, 6, 3, 2 & 7) Open File (Geological - Bedrock)
Citations
Geological Survey of Canada, 1915. Summary Report 1915, p. 48.
Hylands, J.J., Apr/66. Petrology and mineralogy of the Yukon Antimony stibnite deposit. Unpublished BSc thesis, University of British Columbia.
Simpson, R.G., amended July 31 2013, Amended and Restated Technical Report, Skukum gold-silver project, GeoSim Servicesfor New Pacific Metals Corp.

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