Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C13SW00040

Record: MDI42C13SW00040

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Zinc, Copper, Silver

Location

Township or Area: Wabikoba Lake Area

Latitude: 48° 51' 37"    Longitude: -85° 51' 38.6"

UTM Zone: 16    Easting: 583561.8   Northing: 5412549.53    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42C13SW

Point Location Description: Several small stripped outcrops

Location Method: Field Visit

Access Description: The Jenny Creek gold-zinc occurrence is located approximately 28.5 km south of Manitouwadge, 1.4 km northeast of the northern end of Pinegrove Lake and 200 m north of a tributary which flows into Jenny Creek. The occurrence is accessible via motor vehicle followed by travel on foot. From Manitouwadge, proceed south along Highway 614 for approximately 35.5 km to where a tributary of Jenny Creek crosses under the highway immediately south of an abandoned gravel pit. Proceed easterly along a flagged trail which starts in the gravel pit and runs along the north side of the creek for approximately 425 m. Proceed north along another flagged trail for approximately 105 m to the vicinity of the occurrence. Sulphides are exposed in several small, stripped outcrops in this area.

Exploration History

1957: Geological mapping; CPR (M. Bartley, T. Page). 1964-1965: Geological mapping; ODM (V.G. Milne). 1978-1979: Lake sediment and water geochemical sampling; GSC and MNR. Samples collected from the vicinity of the occurrence contained slightly anomalous amounts of Cu, Zn and Au. 1983: Line cutting, ground geophysical surveys (MAG, EM-VLF), soil geochemical sampling, geological mapping, stripping, trenching and lithogeochemical sampling; Chavin of Canada Ltd., New McManus Red Lake Gild Mines Ltd. and Corporate Oil amd Gas Ltd. Airborne geophysical survey (HLEM, VLF-EM, MAG); Aerodat Ltd. 1985: Geological mapping; OGS (G.M. Siragusa and K.M. Chivers). 1989: Dighem airborne geophysical survey; Noranda Exploration Co., Ltd. and Noranda Minerals Inc. (Geco Division). 1991: Prospecting and lithogeochemical sampling which resulted in the discovery of the occurrence; prospector A. Turner. Lithogeochemical sampling; OGS (D.B. McKay). Reconnaissance till sampling; GSC (I.M. Kettles). Samples collected in the general vicinity of the occurrence were found to contain slightly anomalous amounts of Cu. 1992: Linecutting, geological mapping, lithogeochemical sampling, a ground geophysical survey (Deep EM) and diamond drilling (2 holes totalling 360.9 m); Noranda Minerals Inc. (Geco Division) and Noranda Exploration Co., Ltd.

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 Jenny Creek gold-zinc occurrence is located in the Wawa Subprovince approximately 19.5 km north-northeast of the Hemlo mines. The area surrounding the occurrence is underlain primarily by a northeasterly-trending sequence of mafic to felsic metavolcanic and lesser metasedimentary rocks which comprise a portion of the the north limb of the Schreiber-Hemlo greenstone belt (Milne 1968, Map 2147; Siragusa and Chivers 1986, Map P.3046). In the vicinity of the occurrence, the belt has been folded into a large easterly-plunging anticline (Milne 1968, Map 2147). The occurrence is located along the north limb of this structure. The supracrustal rocks in this area are locally strongly foliated (030 to 060 degrees /80 degrees SE) and mineral assemblages indicate they have experienced upper greenschist to lower amphibolite facies-grade regional metamorphism (Milne 1968; Charlton 1992). In the vicinity of the occurrence, the supracrustal sequence is approximately 7.5 km wide and is bounded to the north, south, east and west by granodioritic rocks of the Black-Pic Batholith, the Musher Lake Pluton, the Dotted Lake Batholith and the Gowan Lake Pluton, respectively (Milne 1968, Maps 2146 and 2147). This portion of the belt is dominated by massive to pillowed basalts containing minor metasedimentary interbeds (Milne 1968). The occurrence is located approximately 1.25 km north of the intersection between the Pinegrove Lake and Jenny Creek faults, two large-scale structures which trend northwesterly and northerly, respectively. In the vicinity of the occurrence, the metavolcanic and metasedimentary rocks have been intruded locally by diabase and felsic dikes of variable composition.

Lithology

Lithology Comments

Dec 07, 2005 (D McKay) - The mafic metavolcanic rocks are typically rusty- to tan-weathering, dark green, fine- to medium-grained, moderately to locally strongly foliated, non-magnetic and generally contain less than 1% fine- to medium-grained pyrite and pyrrhotite as disseminated grains. The iron formation(s) is typically rusty-weathering, banded (on a mm scale) light and dark gray, fine-grained, locally moderately foliated, moderately to locally strongly magnetic, very hard and contains up to 5% fine-grained pyrite and pyrrhotite as disseminated grains. In one exposure, the iron formation contained up to 30% garnet as coarse-grained (3 to 6 mm across), purple porphyroblasts. Where exposed, the iron formation is persistent on an outcrop scale. Page (1984) describes the rocks in the vicinity of the occurrence as follows: mineralized iron formations where values of up to 180 ppb gold, 1300 ppb copper and >4000 ppm zinc have been encountered. These iron formations are generally narrow one to five feet thick and contain disseminated pyrite and pyrrhotite within banded magnetite units. The iron formations are folded, discontinuous and are hosted by mafic volcanic rocks. In the vicinity of one of the iron formations, sampling of an altered mafic flow containing disseminated pyrite and pyrrhotite returned 33 ppb gold and >4000 ppm zinc.

Mineralization

Mineralization Comments

Dec 07, 2005 (D McKay) - The mafic metavolcanic rocks are typically rusty- to tan-weathering, dark green, fine- to medium-grained, moderately to locally strongly foliated, non-magnetic and generally contain less than 1% fine- to medium-grained pyrite and pyrrhotite as disseminated grains. The iron formation(s) is typically rusty-weathering, banded (on a mm scale) light and dark gray, fine-grained, locally moderately foliated, moderately to locally strongly magnetic, very hard and contains up to 5% fine-grained pyrite and pyrrhotite as disseminated grains. In one exposure, the iron formation contained up to 30% garnet as coarse-grained (3 to 6 mm across), purple porphyroblasts. Where exposed, the iron formation is persistent on an outcrop scale. Grab samples collected from the occurrence in 1991 by D.B. McKay for the OGS returned assay values which varied from nil to 0.035 ounce Au/ton, nil to 0.96 ounce Ag/ton, 16 to 291 ppm Cu and 24 to 4320 ppm Zn. Grab samples collected from the occurrence in 1991 by prospector A. Turner and submitted to the MNDM for analysis returned assay values which varied from nil to 0.015 ounce Au/ton, nil to trace Ag, 71 to 1188 ppm Cu and 26 to 3800 ppm Zn.

Mineral Record Details

References

Map - Black River area, southwest part, District of Thunder Bay

Publication Number: P0334 Scale: 1:31,680    Date: 1997

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

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

Publication Number: OFR5906 Page: 153-161  Date: 1994

Author: McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

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:

Map - Geological series, Precambrian geology, White Lake (Hemlo) area, Dotted Lake and Black River sections, District of Thunder Bay

Publication Number: P3046 Scale: 1:15,840    Date: 1986

Author: Siragusa G.M., Chivers K.M.

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