Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI53B09NW00008

Record: MDI53B09NW00008

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Skinner Lake Area

Latitude: 52° 42' 20.09"    Longitude: -90° 25' 9.9"

UTM Zone: 15    Easting: 674344   Northing: 5842643.99    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 53B09NW

Point Location Description: Map in Assessment report 53B09NW0004

Location Method: Data Compilation

Exploration History

1981-82: Geophysical, geological and geochemical surveys, trenching and prospecting by 493217 Ontario Ltd. 1983: Canadian Nickel Company Ltd. carried out mapping. 1985-88: Geological mapping, prospecting, trenching and diamond drilling (6 DDH totalling 676.4 m) by Van Horne Gold Explorations Inc., Oracle Resources Ltd. and Power Explorations Inc.

Assessment Work on File

Geology

Province: Superior

Subprovince: Berens River

Terrane: North Caribou

Domain: North Caribou Core

Belt: North Caribou

Geological Age: Mesoarchean  

Lithology

Mineralization

Mineralization Comments

Aug 28, 2019 (Mark Puumala) - Elliott and Corkery (1988) reported that the Akow Lake Fault Zone (or Area No. 2 Shear Zone) occurrence is located at the contact between the North Rim metavolcanic unit of the McGruer assemblage to the east, and the Eyapamikama metasedimentary assemblage (using the terminology of Thurston, Osmani and Stone (1991)) to the west. The rocks to the east of the contact consist of well-foliated, boudinaged tremolite schist. This unit is cross-cut by quartz-carbonate-filled tension gashes that are oriented approximately perpendicular to the foliation. These veins are weakly mineralized (nil to trace sulphide) and do not contain significant concentrations of gold (Elliott and Corkery 1988). The rocks to the west of the contact are described as sheared, locally-mylonitized, silicified, amphibole-rich wackes that are reported by Elliott and Corkery (1988) to contain gold. The mineralized zone in the metasedimentary rocks contains foliation-parallel (337/87) quartz-carbonate lenses, stringers and wisps (Elliott and Corkery 1988). The quartz-carbonate is commonly mineralized with arsenopyrite (typically 1 to 3%) adjacent to the wall rock contacts. The mineralized zone also contains massive arsenopyrite veinlets (up to 10 cm wide) that contain significant concentrations of gold. Elliott and Corkery report that there appears to be a direct correlation between arsenopyrite and gold concentrations in this mineralized zone. Significant assay results reported from surface sampling of this mineralized zone included grab sample results of up to 13 480 ppb Au (quartz veinlets in silicified wacke with 7 to 10% arsenopyrite), and channel sample assays of up to 615 ppb over 0.5 m. The mineralized zone has been traced in surface exposures over a strike length of greater than 200 m, as Elliott and Corkery (1988) reported a grab sample n assay result of 1280 ppb Au at a location approximately 200m north-northwest of the main surface showing. The sub-surface expression of occurrence was also evaluated during a 1987 Power Explorations diamond drilling program (Corkery and Elliott 1988). All six drill holes (OP-87-A-35, 37, 39, 41, 48 and 49) advanced to test this zone intersected the fault, which was described as a zone of intense deformation and alteration that ranged in width between 20 and 36.5 m. Deformation ranged from shearing to brecciation and mylonitization. Alteration included biotite, sericite, chlorite, calcite and sulphides. Sulphide mineralization included pyrrhotite, pyrite and localized arsenopyrite, chalcopyrite and sphalerite. Corkery and Elliott reported seven anomalous gold intersections from three of the six drill holes (OP-A-87-35, 41 and 48), with the most notable being 0.027 oz/ton Au over 0.52 m in drill hole OP-A-87-35 and 0.022 oz/ton Au over 0.49 m in drill hole OP-A-87-41. The anomalous gold values occurred in highly silicified zones mineralized with pyrrhotite, arsenopyrite and pyrite (Assessment report 53B09NW0007). Sample 43795 assayed 605 ppb Au from a basalt containing trace pyrrhotite and arsenopyrite (Assessment report 53B09NW9423). Sample 23074 assayed 13.48 ppm Au from a shear zone with 7-10% arsenopyrite in mafics adjacent to quartz veins (Assessment report 53B09NW0004).

Mineral Record Details

References

Article - Northwestern Superior province: review and terrane analysis

Publication Number: SV04-01.005 Scale:     Date: 1997

Author: Thurston P.C., Osmani I.A., Stone D.

Publisher Name: Ontario Geological Survey

Location:

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