Occurrence Details


Occurrence Number:
115J 017
Occurrence Name:
Cockfield
Occurrence Type:
Hard-rock
Status:
Showing
Date printed:
8/19/2022 11:02:29 AM

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General Information
Capsule
Work History
Assessment Reports
References
Drill Core

General Information

Secondary Commodities: copper, molybdenum
Aliases: Co, Cofield, Dr, Iten, Kokup, Oke, Ray
Deposit Type(s): Porphyry Cu-Mo-Au
Location(s): 62°38'52" N - -138°29'22" W
NTS Mapsheet(s): 115J09
Location Comments: 1 Kilometres
Hand Samples Available: Yes
Last Reviewed:

Capsule

Work History

The northwest edge of the property was partially staked as Ray cl (97882) in Jan/66 by Nordex EL, which performed a geochem survey later in the year. Staked in Jul/69 as CO cl (Y35756) by Newmont on the northwest end, and as DR and Patsy cl (Y35652) in Jul/69 by Dawson Range JV (Straus E Inc, Martin Marietta Corp, Molybdenum Corp of America, Trojan Cons M, and Great Plains Dev C of Can L) on the southeast end. Both groups were explored with mapping and geochem surveys later in the year.
In 1970, the CO group was optioned by United Keno E (United Keno Hill ML, Falconbridge and Can Superior EL), which explored with geochem and IP surveys and 6 drill holes (1479.5 m) and prepared a topographic map from airphotos in 1972.
Restaked as Cofield cl (YA7532) in Aug/76 and as Kokup cl (YA22201) in Aug/79 by Archer, Cathro & Assoc Ltd and optioned in 1980 by Denison ML, which performed mapping and a geochem survey. Cominco tied on the Battle cl (YA48695) in Apr/80 and carried out mapping and a geochem survey.
Archer, Cathro added OKE & Hen cl (YA92164) in Jun/85 and sold the property to Nordac Mg Corp, which optioned it briefly to Gyro Energy & Mls Corp. Nordac, which conducted mapping and geochem sampling in 1986, became Big Creek Res L in 1987.
The Hud & Barr cl (Y49181) were tied on to the south and east in Jan/70 by London Pride Silver ML. Kerr Addison ML tied on KOE cl (YA78417) to the southeast in Sep/83 and explored with mapping and geochem sampling in 1984 and 1985, VLF-EM surveys and hand trenching in 1985 and 5 holes (443.6 m) in 1986.
Walhala Exploration Ltd staked Bat cl (YB35850) northwest of Mt Cockfield in May/91. Both Noranda and Placer Dome visited the property in Aug/91 and took silt, soil and rock samples. This work was compiled for Walhala by Aurum Geological Consultants Inc. in 1992. Galleon Mining Ltd purchased a 20% interest in Walhala's assets in Dec/91.

Capsule Geology

Disseminations and veinlets of pyrite, chalcopyrite and molybdenite occur in a complex intrusive and volcanic setting. The mineralization is best developed in and around a small weakly altered quartz monzonite stock which cuts Paleozoic Nisling Terrane schist and Triassic Klotassin granodiorite at the head of West Battle Creek. The 1970 drilling indicated a fairly uniform grade averaging about 0.03% Cu and 0.013% Mo.
Cominco outlined a number of Cu-Mo anomalies associated with the stock. Chalcedonic quartz veins and clay-sericite-pyrite alteration occur along a major northwest-trending fault. Float from the fault zone is highly anomalous in gold, silver, antimony and arsenic.
The 1986 soil sampling by Nordac returned scattered anomalous gold values as high as 305 ppb, while Kerr Addison's trenches along the northwest-trending fault zone produced a few high values from fault breccia and drusy or massive quartz veins containing arsenopyrite.
Aurum's 1992 compilation shows a strong 500 x 1000 m copper anomaly (>500 ppm Cu) approximately 1.5 km west of Mt Cockfield, and a Noranda rock sample from the same area contained 42 ppb Au, 1035 ppm Cu and 314 ppm Mo.

References

COMINCO LTD, Dec/80. Assessment Report #090792 by A. Denton.

DAWSON RANGE JOINT VENTURE, 1970. Assessment Report *#061373 by R.J. Cathro.

DAWSON RANGE JOINT VENTURE, 1970. Assessment Report *#061124 by D.D. Rand.

DENISON MINES LTD, Mar/81. Assessment Report *#090767 by R.J. Cathro.

GYRO EXPLORATION AND MINING CORP., Dec/85. Engineer's Report by J.M. Dawson.

KERR ADDISON MINES LTD, Oct/84. Assessment Report *#091568 by H. Copland and D. Arscott.

KERR ADDISON MINES LTD, Jan/86. Assessment Report *#091725 by D. Arscott.

MINERAL INDUSTRY REPORT 1969-70, p. 64-68.

NEWMONT MINING CORPORATION OF CANADA LTD, 1969. Assessment Report *#060215 by C.P. Costin and W. Dolan.

UNITED KENO HILL MINES LTD, 1970. Assessment Report *#091346 by I.D. and R.E.V.

WALHALA EXPLORATION LTD, Jan/93. Assessment Report #093064 by R.A. Doherty.

YUKON GEOLOGY AND EXPLORATION 1979-80, p. 265-266.

YUKON EXPLORATION AND GEOLOGY 1984 (Open File).

YUKON EXPLORATION 1985-86, p. 361; 1987, p. 279.

Work History

Date Work Type Comment
12/31/1986 Geology
12/31/1986 Geochemistry
12/31/1980 Geology
12/31/1980 Geochemistry
12/31/1972 Drilling Six holes, 1,397 m.
12/31/1972 Geochemistry
12/31/1972 Ground Geophysics
12/31/1969 Geology
12/31/1969 Geochemistry
12/31/1966 Geochemistry
12/13/1991 Geochemistry Also rock and silt sampling.

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
093064 1992 Geological and Geochemical Assessment Report on the Battle Mountain Property Historical Drill Core Geochemistry, Rock Geochemistry, Silt Geochemistry, Soil Geochemistry, Prospecting Other, Data Compilation Pre-existing Data
091924 1986 Report on Geochemical Survey-Mt. Cockfield Property-Mt. Cockfield, Y.T. Rock Geochemistry, Soil Geochemistry, Prospecting Other
090767 1980 Report on Geology and Geochemistry-Kokup 1-24 Claims Rock Geochemistry, Soil Geochemistry, Bedrock Mapping Geology, Prospecting Other
061124 1972 Photogrammetric Mapping-Dr and Patsy Claims Photogrammetry Remote Sensing
091346 1970 1970 Diamond Drill Statistics-Mount Cockfield Diamond Drilling, Drill Core Geochemistry 6 1397.20
061373 1970 Geological Mapping and Geochemical Sampling-Dr 1-64 and Patsy 1-8-Mt Cockfield Area Silt Geochemistry, Soil Geochemistry, Bedrock Mapping Geology, Prospecting Other
060215 1969 Geophysical and Geochemical Reports on the CO Claim Group Silt Geochemistry, Soil Geochemistry, Magnetics Ground Geophysics

Related References

Number Title Page(s) Reference Type Document Type
ARMC004700 1986 program report on the Koe claims Property File Collection Report
ARMC016555 Photo interpretation map of geology with coloured sections - 115J/9 - Selwyn River Property File Collection Geoscience Map (Geological - Bedrock)
ARMC016554 Photo interpretation map showing claims - 115J/9 - Selwyn River Property File Collection Geoscience Map (General)
ARMC016556 Geology map - 115J/9 - Selwyn River Property File Collection Geoscience Map (Geological - Bedrock)

Drill core at YGS core library

Number Property Year Drilled Core Size Photos Data
YK-86-01 Cockfield 1986 BQ 0 3
YK-86-02 Cockfield 1986 BQ 0 2
YK-86-03 Cockfield 1986 BQ 10 2
YK-86-04 Cockfield 1986 BQ 8 2
YK-86-05 Cockfield 1986 BQ 4 2