Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12SW00012

Record: MDI42E12SW00012

General

Commodities

Primary Commodities: Gold

Location

Township or Area: McComber

Latitude: 49° 37' 14.63"    Longitude: -87° 52' 4.97"

UTM Zone: 16    Easting: 437302   Northing: 5496825    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12SW

Point Location Description: Trenches in Assessment file 42E12SW0029

Location Method: Data Compilation

Access Description: The property is located in McComber Township, 7 km east-northeast of Beardmore. Access is via claim lines or air transport.

Exploration History

1925: H. Jarvela staked 6 claims. 1927: Claim group was expanded to 13 claims. The Hewitt Mining Company Ltd. held the McKenzie claim group which consisted of 7 claims adjoining the then 6 claim Jarvela group on the west. Trenching and pitting completed. 1935-36: Nipsona Mines optioned 7 claims from the McKenzie-Jarvela Group. Trenching, pitting and diamond-drilling were reported as completed. A shaft was planned with levels at 150 feet and 300 feet. 1937: Coniagas Mines was reported to have optioned the McKenzie-Jarvela group from Nipsona Mines. 1939: Kenmore Gold Mines reportedly acquired the McKenzie claims. 1950: Most claims lapsed. 1958: Copper Prince optioned 26 claims and carried out stripping and sampling. 1977-1981: A. Hopkins staked the property as part of a larger claim block and conducted power stripping, geochemistry and drilled 6 DDH totalling 474.4 m. 1981: Pancontinental Mining (Canada) Limited optioned the property. Geophysics, benefication, geology, linecutting and diamond-drilling have been recorded on a larger block covering the McKenzie-Jarvela Occurrence.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The occurrence is located in the Southern Metavolcanic Belt. The claims are underlain entirely by andesitic or basaltic lava striking about north 69 degrees east and dipping steeply to the north. Several narrow bands of iron formation were noted. The largest of these bands was about 18 m in width. The iron formation probably was deposited between flows. A few dykes of feldspar porphyry were noted. These appear to follow the foliation of the lava. Langford (1928) described the McKenzie and Jarvela Occurrences as two separate properties, although they appear to lie on the same vein. The McKenzie claims contain two veins, which range in width from 0.3 m to 1 m, and are separated by 1.2 m to 1.5 m of greenstone schist. The quartz is a milky or bluish white color, rusty along the cracks, and is mineralized with sulphides and native gold. Both walls are greenstone schist. The Jarvela claims contain a vein that, where first exposed, consists of 15 cm of rusty quartz, in schisted greenstone, which widens to 50 cm in 4.5 m and carried sulphides with specks of native copper and gold. The greatest width of the quartz in these lenses is 1.2 m. The Copper Prince Property consists of a zone 600 or 800 feet wide, displaying moderate shearing, and extending the entire length of the property. In the approximate centre of the zone, shearing is quite intense and quartz has been injected, usually in the form of lenses up to 4 feet in width and up to 500 feet in length. Fine visible gold was noted at several points on the 'Jarvela' vein.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Approximately 275 m north of the Jarvela vein can be found the North Vein, which has been traced by trenches and stripping for almost 250 m. This vein is especially well mineralized, with galena and arsenopyrite. Gold values are disappointingly low. The only other mineralization worth mentioning occurs in a band of iron formation near the south boundary of the property. The iron formation here is highly oxidized and shows traces of sulphides. Extensive panning of the outcrops showed no trace of gold. Greer (1958) noted the best channel sample assayed 0.38 oz/ ton Au over 0.1 m in the Jarvela vein, but visible gold is disseminated erratically throughout the vein.

Oct 17, 2019 (Therese Pettigrew) - Langford (1928) described the mineralogy of the McKenzie (Hewitt) and Jarvela Occurrences as two separate properties, although they appear to lie on the same vein: Hewitt Mining Company (formerly McKenzie) "The 7 claims of this company are located south of the railway at mileage 17. The west end of the main showing is to be seen at a point 5 chains north of the No. 2 post of claim TB4850. It consists of two veins, which range in width from 1 to 3 feet and are separated by 4 to 5 feet of greenstone schist. The quartz is a milky or bluish-white colour, rusty along the cracks, and is mineralized with pyrite, chalcopyrite, arsenopyrite, galena, sphalerite, and native gold. Both walls are greenstone schist, and the vein is uncovered for 100 feet east from the above point. Eleven chains east along the same strike, the same vein has apparently been uncovered for another 1,000 feet, where it shows 1.5 feet of rusty quartz in schistose greenstone, mineralized with galena, sphalerite and pyrite. Jarvela: These 6 claims are immediately east of the Hewitt claims, and the main showing on them is a probable continuation of the Hewitt vein, for along the same strike a vein is found 6.5 chains east of the west line of claim TB4843. Where first exposed it consists of 6 inches of rusty quartz, in schisted greenstone, which widens to 20 inches in 15 feet and carried chalcopyrite, arsenopyrite, galena, and small specks of native copper and gold. This structure has been found to continue eastward for a distance of 40 chains, by means of pits. The greatest width of the quartz in these lenses is 4 feet" (Mason and White, 1986). There is a system of three quartz veins: the McKenzie, the Central and the Jarvela. These veins are quite narrow - usually between six inches and a foot. A sample collected in 1958 returned $13.30 across 12”. Based on $35 gold, this converts to 13.03 g/t Au over 0.3 m. The vein is from a few inches to 30 inches in width and contains visible gold in places. Another sample collected in 1958 assayed 1.33 oz/t Au (Assessment report 42E12SW0029). Based on the maps in the assessment reports, it appears that the McKenzie-Jarvela vein system is on the same trend. Based on the description in Langford (1928), the McKenzie/Hewitt vein is located at approximately Zone 16, 437048 m E, 5496845 m N. The Jarvela vein is located at Zone 16 437302 m E, 5496825 m N.

Mineral Record Details

References

Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane

Publication Number: OFR5630 Page: 399-402  Date: 1986

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

Location:

Article - McComber and Vincent townships, District of Thunder Bay

Publication Number: MP116.007 Date: 1997

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Book - 42E12SW - unpublished GDIF

Publication Number: GDIF Date: 1988

Author: Ontario Geological Survey

Publisher Name: Ontario Geological Survey

Location:

Map - Namewaminikan (Sturgeon) River area, District of Thunder Bay, Ontario

Publication Number: M1934C Scale: 1:126,720    Date: 1997

Author: Bruce E.L., Rickaby H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts

Publication Number: M2102 Date: 1997

Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Preliminary report on the geology of the Blackwater-Beardmore area

Publication Number: PR1951-07 Date: 1998

Author: Peach P.A.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological series, Precambrian geology, McComber Township, District of Thunder Bay

Publication Number: P2853 Scale: 1:15,840    Date: 1985

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Map - Beardmore-Nezah gold area, District of Thunder Bay, Ontario

Publication Number: ARM37K Scale: 1:63,360    Date: 1998

Author: Langford G.B.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Geology of the Beardmore-Nezah gold area, District of Thunder Bay

Publication Number: ARV37-04.003 Date: 1998

Author: Langford G.B.

Publisher Name: Ontario Dept. of Mines

Location:

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