Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E04NW00006

Record: MDI42E04NW00006

General

Commodities

Primary Commodities: Copper

Secondary Commodities: Gold

Location

Township or Area: Cosgrave Lake Area

Latitude: 49° 12' 32.52"    Longitude: -87° 49' 47.73"

UTM Zone: 16    Easting: 439551.985   Northing: 5451024.893    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42E04NW

Point Location Description: Diamond drill holes, trenches, stripped areas.

Location Method: Conversion from MDI

Access Description: The Potter Occurrenc lies midway between the East Jackpine River and the Jackpine River. It is situated along Glacier Creek about 5.6 km southeast of Cosgrave Lake (claim map G 25, Cosgrave Lake area). The copper showings occur along the Glacier Creek Fault from the Potter occurrence in the south to the Michon occurrence in the north. Access is by the Little Bear Quarry Road (Camp 81 Road) which is located about 19 km east of Nipigon. The showing occurs about 25.6 km northeast along this road.

Exploration History

1955: Staked by Reino O. Kotanen, John W. Price and P. Forsgren. Copper mineralization was discovered along the Glacier Creek Fault 1956: Thirteen diamond drill holes totalling 1061 m were drilled by Ray Potter and Associates. Optioned to Frobisher Limited who conducted geological, magnetometer and electromagnetic surveys over the area. Seven diamond drill holes totalling 583.6 m were drilled by MacLeod Cockshutt Gold Mines Limited. 1961: The claims lapse. 1961-1965: Claims were restaked but no work was recorded. 1965: R. Barker drilled 10 holes totalling 1445 feet. This work was done on the Miron property (Area E). 1966: Big Nell Mines Ltd. conducted a compilation and property report by T.W. Page. 1967: A small amount (unknown total) of diamond drilling was completed by Midland Nickel Corp. Ltd. 1969: Geophysical (EM) survey was conducted by Oja Limited. Canadian Addicks Mining Corp. conducted stripping, trenching and sampling over four main zones. 1971-1972: Six drill holes totalling 811 feet were drilled. The Miron or Area E was covered. 1976: J. Haggerty staked the prospect and all interest was transferred to Vantage Mining Company Inc. 1977: Geological, geophysical (EM) surveys were conducted and reports submitted by E.A. Hart Limited and R. Kidd, respectively. Seven diamond drill holes, aggregating 697.9 m were completed on TB 407860. 1981-1982: The claims lapsed. 1983: B. Michon staked the Dello Lake occurrence as well as the north end of the copper occurrences known as the Michon copper occurrence. 1988-1989: The Glacier Creek property (Potter and Miron) was staked by D. Kukkee who conducted prospecting, sampling, striping, trenching. A 60 claim block was staked. 1990: D. Kukkee with help from an OPAP grant conducted stripping, trenching, prospecting and sampling. A VLF survey was conducted. 1990-91: Noranda optioned the property and conducted geological mapping and diamond drilling.

Geology

Province: Superior

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - Schnieders and Smyk (1990) described the general geology: The area is underlain by granite gneiss and metasedimentary rocks, as well as later granitic stocks and dikes. The metasedimentary rocks include biotite quartz feldspar gneiss, garnet gneiss, hornblende schist and augen gneiss as identified by Pye (1965). The metasedimentary rocks identified by the authors were predominately biotite schists, and biotite quartz feldspar gneiss and displayed strong foliation and evidence of folding, faulting and shearing. Granite and granitic migmatite envelop the metasedimentary xenoliths and remnants. Pye (1965, p.102) describes the Glacier Creek deposit: The Potter copper deposit occurs along the Glacier Creek fault, about 2.6 km east-northeast of O'Keefe Lake in the extreme southeastern part of the map area. It occurs where the fault cuts and truncates a band of sediments, 305-730 m wide, which occurs as an east-northeast trending inclusion in granite rocks. It is essentially a wide zone of brecciation, in which highly fractured biotite and augen gneisses, and some granitic rocks, are cut by narrow veins of quartz and calcite and mineralized with disseminated pyrite and chalcopyrite. The mineralized zone has been traced N20 degreesE in diamond drill holes for 730 m. It dips vertically and ranges up to about 30 m in width. Schnieders and Smyk (1990) write: Additional narrow veins appear slightly oblique to the main fault and possibly represent second order tensional veins. The veins are commonly hosted by a pink feldspar rich granitic rock interpreted as representing a late granitic intrusion. The intrusion is commonly crosscut by pegmatite dikes which may have remobilized and concentrated the sulphides.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - In one hole drilled by MacLeod Cockshutt Gold Mines Limited a mineralized section was encountered averaging 0.49 percent copper over 31.7 m. Diamond drilling by Potter and Associates, and MacLeod Cockshutt Gold Mines indicated a zone of copper mineralization of over 730 m in length within the Glacier Creek fault zone. The zone dips vertically and ranges up to 30 m in width. Marchand (1990) stated that the best intersection consists of 0.50% Cu over 104 feet. Although very limited gold assaying was done over the core, a value of 0.06 ounce per ton Au over 10 feet was obtained. Gold values from a breccia zone have assayed as high as 0.13 ounce per ton Au. Drilling by Ray Potter and Associates intersected the best values of 0.81% Cu over 30 feet and 1.12% Cu over 11 feet (Marchand 1990). Diamond drilling by Potter and Associates gave the following results (% Cu): Hole 1: 10 feet @ 1.48% or 50 feet @ 0.55%. Hole 2: 14 feet @ 0.80%. Hole 3: 3 feet @ 1.67%. Hole 4: 5 feet @ 1.30% . Hole 5: 7 feet @ 1.48% or 17 feet @ 1.07%. Hole 6: 16 feet @ 0.569%. Hole 7 20 feet @ 0.387%. Hole 8 104 feet @ 0.488%. Hole 9 50 feet @ 0.534%. Hole 11 5.5 feet @ 0.35%. Hole 12 5.4 feet @ 0.74%. . Hole 13 5.8 feet @ 1.06% *Hart (1977) reports: The best mineralized area found in the drilling program of Aspen Explorations Inc. in 1977 was in Hole 4, where a width of 12.0 feet (3.66 m) assayed 0.32% copper.

Mineral Record Details

Site Visit Information

Date: Feb 28, 1997

Geologist: B Nelson

Notes: Resident Geologist personnel visited the occurrence June 28, 1989 and June 28, 1990. In 1989 more than 23 grab and chip samples (89 BDK 01 to 23) were collected by the Resident Geologist from an area over 2 km in strike length and covering Areas A to E (Marchand 1990). Copper values up to 17.2 percent from selected grab samples were received and while gold values were generally low (nil to 0.01 ounce per ton Au), several values up to 0.05 ounce per ton Au were returned. Additional sampling by Resident Geologist personnel in 1988, 89 and 90 returned values of <0.01 to 0.05 oz/ton Au, nil to <0.10 oz/ton Ag and 3500ppm to 7.15% Cu. It is, however, unknown where along the fault these samples were taken.

References

Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District

Publication Number: M2232 Scale: 1:253,440    Date: 1973

Author: Carter M.W., McIlwaine W.H., Wisbey P.A.

Publisher Name: Ontario Division of Mines

Location:

Map - Highstone Lake-Miniss Lake area, west sheet, Kenora and Thunder Bay districts

Publication Number: M2063 Scale: 1:63,360    Date: 1997

Author: Hudec P.P.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Copper, nickel, lead and zinc deposits in Ontario (revised to February, 1957)

Publication Number: MDC002 Page: 60-61  Date: 1957

Author: Thomson J.E., Ferguson S.A., Johnston W.G.Q., Pye E.G., Savage W.S., Thomson R.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Red Rock-Pine Portage sheet, District of Thunder Bay, geological compilation series

Publication Number: P0357 Scale: 1:126,720    Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology and lithium deposits of Georgia Lake area, District of Thunder Bay

Publication Number: R031 Page: 102  Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Copper, nickel, lead and zinc deposits of Ontario

Publication Number: MDC012 Page: 331  Date: 1969

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.

Publication Number: OFR5951 Date: 1996

Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office