Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C13SE00012

Record: MDI42C13SE00012

General

Commodities

Primary Commodities: Zinc, Copper, Nickel

Secondary Commodities: Gold

Location

Township or Area: White Lake Area

Latitude: 48° 46' 8.05"    Longitude: -85° 37' 3.06"

UTM Zone: 16    Easting: 601584   Northing: 5402688    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42C13SE

Point Location Description: Point 87 on OGS map M2614

Location Method: Data Compilation

Access Description: The occurrence is located approximately 41.5 km southeast of manitouwadge and 5.5 km west of Patina Lake. The occurrence is situated near the east shore of White Lake 1.75 km south of Manido Island. The occurrence is accessible via motor vehicle followed by travel in boat and then on foot. From the intersection of Hwys 614 and 17, proceed easterly along Hwy 17 for approximately 17 km to an unnamed gravel road that leads north to a public boat launch on the west shore of White Lake. Proceed northerly, via boat, along the east side of White Lake for approximately 6 km to a small creek which flows into the east end of the first bay located north of Crab Rocks. Proceed east (parallel to the creek) through the bush for approximately 250 m to the vicinity of the occurrence. A graphitic shear zone containing copper- and zinc-bearing sulphide minerals is located on the high ground south of the creek. Several small trenches have been emplaced along this structure.

Exploration History

1965: Geological mapping; V.G. Milne (ODM). 1978-1979: Regional lake sediment and water geochemical survey; GSC-MNR. Samples collected from lakes in the vicinity of the occurrence did not contain anomalous amounts of gold nor base metals. 1983: Airborne geophysical survey (HLEM, VLF-EM, MAG); Aerodat Ltd. 1984: Geological mapping; G.M. Siragusa (OGS). Siragusa noted the presence of gossanous rock in the vicinity of the occurrence. 1990: Showing was discovered. Prospecting, stripping, trenching and sampling; prospectors D. and G. Carrol. Geological mapping and lithogeochemical sampling; E. Gallo working on behalf of the Carroll brothers. 1991: Line cutting, ground geophysical surveys (MAG, VLF-EM) and soil geochemical sampling; E. Gallo working on behalf of the Carroll brothers. 1993: Lithogeochemical sampling; D. B. McKay. 1994: Winslow Gold Corp. staked the property. 1996: Winslow Gold carried out prospecting, sampling, and geological mapping.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Metamorphism Type: Regional

Metamorphism Grade: Amphibolite

Geology Comments

Dec 07, 2005 (D McKay) - The occurrence is underlain primarily by a south-southeasterly-trending sequence of mafic metavolcanic and clastic metasedimentary rocks which comprise the eastern tip of the north limb of the Schreiber-Hemlo greenstone belt. These rocks are locally strongly foliated (170 degrees/80degrees W) and mineral assemblages indicate they have experienced lower amphibolite facies-grade regional metamorphism. In the vicinity of the occurrence, the supracrustal sequence is approximately 650 m wide and is bounded to the east and west by granodioritic rocks of the Dotted Lake Batholith. The occurrence is located near the centre of the belt within a 250 m wide sequence of clastic metasedimentary rocks flanked to the east and west by amphibolitic mafic metavolcanic rocks. The mafic metavolcanic and metasedimentary rocks in the vicinity of the occurrence have been intruded locally by feldspar-porphyritic sills and diabase dikes. The White Lake Fault, a regional-scale, northeast-trending structure, is located approximately 4.5 km to the west. The occurrence is hosted within sheared, locally graphitic metagreywacke. This shear zone has been traced for approximately 1.2 km along strike and its width appears to exceed 10 m.

Lithology

Lithology Comments

Dec 07, 2005 (D McKay) - The metagreywacke is a mgr. bio-q-fel paragneiss. It consists essentially of quartz, oligoclase, and biotite, with accessory microcline, graphite, pyrite, epidote and rare garnet. It is poorly bedded in a general north-south direction and dips steeply to the west. On the weathered surface the metagreywacke is generally medium to dark grey and on the fresh surface it displays a slightly darker color. The biotite content varies from 5 - 15% and averages about 10%. Darker and lighter bands may be present in the rock reflecting greater and lesser concentrations of biotite. These bands vary in thickness from a few millimetres to over a metre. Despite this banding, the gross composition of the rock appears to be quite homogeneous. The meta-arkose is a q-plag gneiss that is interedded with the metagreywacke. Minor biotite, pyrite and sericite are present. Locally, pods and lenses of semi-massive graphite with pyrite, pyrrhotite, chalcopyrite and rare sphalerite are also present. This unit may be a tuffaceous metavolcanic rather than a siliceous metasediment. It commonly displays a rusty weathered surface. On the fresh surface it is pale or whitish grey. The rock is fine-grained. The quartz and plagioclase together constitute 80 - 90% of the rock. The felsite sills and the feldspar porphyry sills are generally similar in appearance and over-all composition. Both are light grey in color on the weathered surface, and a light grey, almost pinkish-grey on the fresh surface. Both are fine-grained, dense and massive. Both are comprised of 90+% quartzofeldspathic material. Small flakes of biotite occur sparsely disseminated throughout the rock. The only difference between the felsite and the feldspar porphyry appears to be the presence of small feldspar phenocrysts in the latter. These phenocrysts are creamy-white, and average about 2 mm in size. Most of the felsite and feldspar porphyry dikes are quite narrow, usually <0.5 m in width.

Mineralization

Mineralization Comments

Dec 07, 2005 (D McKay) - The graphitic zone and the meta-arkose beds carry disseminated sulphides, often concentrated in narrow, conformable seams. The sulphides consist primarily of pyrrhotite, locally forming up to 25% of the rock. Pyrite, sphalerite and chalcopyrite are also present, locally in concentrations of up to 5%, 5% and 3%, respectively. Grab samples collected from the occurrence by E.A. Gallo in 1990 returned assay values of up to 0.004 ounce Au/ton, 8 ppm Ag, 6400 ppm Cu, 6854 ppm Zn, 880 ppm Ni and 6 ppm Mo. Grab samples collected from the occurrence by prospector T. Carroll are reported to have returned assay values of up to 0.12 ounce Au/ton. Grab samples collected from the occurrence in 1993 by D.B. McKay returned assay values which varied from <5 to 23 ppb Au, <0.1 to 0.8 ppm Ag, 26 to 640 ppm Cu, 23 to 4610 ppm Zn and 16 to 78 ppm Pb.

Alteration Comments

Dec 07, 2005 (D McKay) - Several narrow glassy quartz stringers up to 10 cm in width, and carrying up to 2% disseminated pyrite cut through the metasediments locally.

Mineral Record Details

References

Book - National Geochemical Reconnaissance Release NGR 35-1978, Regional Lake Sediment and Water Geochemical Reconnaissance Data, Ontario Eastern Shore, Lake Superior

Publication Number: OF 555 Date: 1979

Author: Hornbrook, E.H.W., Coker, W.B., Lynch, J.J.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/129524

Map - Geophysical Series, White Lake, Thunder Bay District, Ontario

Publication Number: Map 2168G Scale: 1:63,360    Date: 1963

Author: Geological Survey of Canada

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/116493

Mono - Mineral Occurrences in the Manitouwadge Area, Volumes 1, 2 and 3

Publication Number: OFR5906 Page: 61-69  Date: 1994

Author: McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

Map - White Lake sheet, Thunder Bay District

Publication Number: M2147 Scale: 1:31,680    Date: 1968

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of the Black River area, District of Thunder Bay

Publication Number: R072 Date: 1968

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Regional Lake Sediment and Water Geochemical Reconnaissance Data, Northwestern Ontario

Publication Number: GSC OF 2360 Date: 1991

Author: Friske, P.W.B., Hornbrook, E.H.W., Lynch, J.J., McCurdy, M.W., Gross, H., G

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/132379

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Manitouwadge-Wawa sheet, geological compilation series, Algoma, Cochrane, Sudbury and Thunder Bay districts

Publication Number: M2220 Scale: 1:253,440    Date: 1972

Author: Milne V.G., Giblin P.E., Bennett G., Thurston P.C., Wolfe W.J., Giguere J.F., Leahy E.J., Rupert R.J.

Publisher Name: Ontario Division of Mines

Location:

Map - Geological series, Precambrian geology, Lumby Lake area, western part, Kenora District

Publication Number: P2828 Scale: 1:15,840    Date: 1985

Author: Jackson M.C., Chevalier P.

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