Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12NW00034

Record: MDI42E12NW00034

General

Commodities

Primary Commodities: Gold, Zinc, Lead

Secondary Commodities: Silver

Location

Township or Area: McComber

Latitude: 49° 39' 55.03"    Longitude: -87° 51' 19.48"

UTM Zone: 16    Easting: 438271   Northing: 5501768    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12NW

Point Location Description: AMIS and DDH locations

Location Method: Data Compilation

Exploration History

1962-63: Westfield Minerals Ltd. conducted mag and IP surveys, and drilled 3 DDH totalling 381.9 m. 1983: Normine carried out mag and VLF-EM surveys, geological mapping, and sampling. 1986: C. Pettit contracted an airborne magnetometer survey. 1987: Flagship Resources Ltd. optioned the property and carried out ground magnetometer and VLF-EM surveys. 1988: Moss Resources Ltd. optioned the property and carried out geological mapping, prospecting, trenching, and sampling. 1990: Highlander Minerals Ltd. carried out ground magnetometer and VLF-EM surveys and drilled 3 DDH totalling 304.8. 1991: C. Pettit conducted magnetometer and VLF-EM surveys and sampling. 1994: C. Pettit drilled 1 x-ray hole totalling 99.06 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Oct 17, 2019 (Therese Pettigrew) - The Pettit Property is underlain by rocks belonging to the Southern Metasedimentary Sub-belt which has been the host for over 94 percent of the gold production in the camp. It straddles a 4.2 mile strike length of the Watson Lake Fault, a major regional tectonized boundary between metavolcanics to the north and metasediments to the south. A regionally extensive unit of magnetite-chert-hematite iron formation occurs in close proximity to the fault. The fault and the iron formation are spatially associated with gold deposits (including the Leitch Mine, a former major producer) along strike to the west and east of the property (Assessment report 42E12NE0001).

Lithology

Mineralization

Mineralization Comments

Oct 17, 2019 (Therese Pettigrew) - A narrow gold-bearing quartz-carbonate vein hosted in sheared pyritic pillowed basalt is exposed in two trenches to the north of Watson Lake between L2E and L4E near the west end of the lake. In Trench 88-A, a 10 cm wide vein contains up to 15% sphalerite, 5% galena, 2% chalcopyrite and minor pyrite. Grab sample assays from the vein range up to 3.9 ounces gold per ton, with silver, lead and zinc contents up to 0.77 ounces per ton, 4.75% and 14.86%, respectively. Channel samples across the vein assayed only up to 1807 ppb gold, indicating that mineralization is sporadic. Samples from the wallrock contained less than 100 ppb gold. The northern extension of the gold-bearing quartz-carbonate vein is exposed in Trench 88-B. A grab sample from the vein (average width: 6 cm) assayed 0.2 ounces of gold per ton but a high value of 509 ppb was obtained from subsequent sampling. The vein contains 1-2% galena, 20-25% sphalerite and trace chalcopyrite (Assessment report 42E12NE0001). DDH 94-2 returned assays of up to 0.339 ppm Au and 924 ppm Zn (Assessment report 42E12NW0037).

Mineral Record Details

References

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

Publication Number: OFR5630 Scale:     Date: 1986

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

Publisher Name: Ontario Geological Survey

Location:

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Ministry Contact Information

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