Mineral Deposit Inventory for Ontario

Ministry of Energy, Northern Development and Mines

Deposit: MDI000000002283

General

Commodities

Primary Commodities: copper, zinc

Secondary Commodities: gold

Location

Township or Area: Oboshkegan

Latitude: 50° 7' 42.28"    Longitude: -87° 35' 30.91"

UTM Zone: 16    Easting: 457692   Northing: 5553076    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42L04NW

Point Location Description: DDH KL04-08 collar location from Assessment file 20000000843

Location Method: data compilation

Access Description: The Wobbegong property is accessible from a tertiary logging access road that leaves the Kinghorn logging road at kilometer 74.5.

Exploration and Mining History

1978: Amax Minerals conducted an airborne EM and magnetic survey. 1980: Hollinger Argus Ltd. drilled 1 DDH totaling 110.6 m in the Branstrom Lake area. 1988: Noranda Exploration Ltd. carried out an airborne EM and magnetic survey, ground VLF-EM, magnetometer, and HLEM surveys, geological mapping, and sampling. 1999: S. Roach carried out prospecting, mapping, sampling, and ground VLF-EM and magnetometer surveys. 2001: S. Roach carried out trenching, sampling, and mapping. 2002: S. Roach carried out channel sampling, a humus survey, and mapping. 2003: S. Roach carried out trenching and sampling. 2004: Kodiak Exploration Ltd. carried out a soil geochemical survey, HLEM and magnetic surveys, prospecting, stripping, mapping, sampling, and drilled 4 DDH totaling 488 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Onaman

Geological Age: Archean   

Mineral Deposit Lithology

Lithology Comments

03/28/2019 (T Pettigrew) - The showings consist of massive pyrite (up to 12 cm wide) interbedded with cherty tuff, reworked felsic volcaniclastics, and pyritic graphite. There is strong silicification-(sericitic) alteration adjacent to the exhalative horizon. It is commonly rusty brown to bleached white on both the weathered and fresh surfaces. The zone trends 51 to 60 degrees and dips between 69 and 87 degrees to the north (Assessment file 42L04NE2015).

Mineralization

Mineralization Comments

03/28/2019 (R Cundari) - The Wobbegong Conductive Trend (centred at UTM 457595E 5553091N, Zone 16) can be traced for 5 km in a northeast direction from north of Barn Lake in the south to north of Oboshkegan Lake. This trend is characterized by 13 conductive HLEM lenses (coincident with magnetic anomalies) which vary in length from 100 to 1200 m. Coincident strong EM conductors and magnetic anomalies are reflected in 3 surface showings (Mako, Jeremi and P-51 zones) exposed by trenches cut across the conductive trend. Observations by staff of the Thunder Bay North Resident Geologist office indicate the presence of massive to semi-massive sulphide mineralization hosted in a rusty gossanous chlorite-rich volcanoclastic breccia. Mineralization includes massive pyrite and semi-massive to disseminated sphalerite and chalcopyrite. Analysis of samples collected by both the Thunder Bay North Resident Geologist office and the property owners returned values up to 1.03% Zn and 0.35 g/t Au from grab samples and 0.40% Zn and 0.35% Cu over 0.90 m in channel cuts (White et al., 2014; Assessment report 42L04NE2028).

03/28/2019 (T Pettigrew) - DDH KL-04-08 assayed 0.67% Cu and 0.17% Zn over 0.38 m from 50-50.38 m, as well as 0.35 g/t Au over 0.54 m from 50.67-51.21 m (Assessment file 20000000843). The Mako Zone displays pyrrhotite, pyrite, chalcopyrite and sphalerite mineralization in trenches on lines 101 E and 102 E. The same horizon can be traced east to line 105. There is a rapid lateral change of host rock and mineralization from grid west to east, with massive sulphides hosted in altered felsic fragmentals to the west and graphitic argillite to the east. The fragmental rocks are commonly coarse and may be matrix or clast supported. The matrix is sodium depleted, iron-rich, with chlorite+- biotite alteration. Felsic clasts consist about strong sericite +/- carbonate alteration with pyrite +- pyrrhotite +- sphalerite. From section 101+00 E to 102+00 E, massive sulphide/massive sulphide breccia (pyrrhotite+pyrite+sphalerite+chalcopyrite) is hosted in a hydrothermal sericite-carbonate alteration cap of reworked felsic metavolcanics with minor carbonaceous clastic metasediments. The sulphide horizons vary in thickness from 0.1 meters to 1.0 meters. The host rock is a strongly deformed, sericitic and carbonate altered, polymictic felsic tuff, lapilli-tuff, and volcaniclastic. Both these horizons consist of bedded very fine to fine grained massive sulphide and massive sulphide breccia. The mineralogy consists of pyrite + pyrrhotite +/- sphalerite +/- chalcopyrite. The massive sulphides are thickest (up 1.0 m thick) in trench WB-02 (section 101 +00 E) and exhibit a well-developed breccia texture (Assessment file 20000000843).

References

Publication - Report of Activities, 2013, Resident Geologist Program, Thunder Bay North District, p. 34-36

Publication Number: OFR6292    Date: 2014

Author: White, G.D., Cundari, R.M., Tuomi, R.D., Brunelle, M.R., Debicki, R.L.

Publisher Name: OGS

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Ministry Contact Information

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