Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52F07SW00004

Record: MDI52F07SW00004

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Lower Manitou Lake Area

Latitude: 49° 21' 28.81"    Longitude: -92° 53' 34.65"

UTM Zone: 15    Easting: 507773   Northing: 5467260    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F07SW

Point Location Description: Sample K087543 from Assessment report 20000013536

Location Method: Data Compilation

Access Description: The prospect is located 47 km south of Dryden, 850 m east from the north end of a lake immediately east of Merrill Lake. Access to the property is best obtained from Jackfish Bay of Upper Manitou Lake. The occurrence consists of two sets of quartz veins, which have been pitted and trenched. (OFR 5731, p. 43; 1990)

Exploration History

1895: Three Swedes attempted to recovered gold from a small placer operation. Gold was reported to occur in the mud of the swamp near a 2 1/2 foot wide quartz vein. A specimen taken from this vein yielded 38 1/3 ounces of gold per ton (Coleman 1896). A second 7 foot wide vein, approximately 850 feet to the southwest (main vein of the West Shear Zone), yielded 0.803 ounce of gold per ton in a mill run (Coleman 1896). 1896: The property was sold to Kansas City capitalists (January 1897, The Colonist). 1932-1933: Charles Merrill and James Walmsley uncovered a new quartz vein about 300 feet east of the main vein, and exposed it over 325 metres along strike (Thomson 1934). This vein would be in the East Shear Zone. 1933-1934: The property is optioned to Arnold Hughes. Surface trenching and test pitting was carried out. 1934: Thomson (1934) noted visible gold to be commonly found in the main veins in the West Shear Zone, and obtained an assay of 0.16 ounce gold per ton across 3 feet, and 4.64 ounces per ton from a grab sample. 1939: Charles Merrill and James Walmsley brought the claims to patent. 2004: K: Bjorkman completed a prospecting and sampling program. 2005: Rubicon Minerals Corp. carried out prospecting and sampling. 2011: Manitou Gold Inc. carried out prospecting and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Terrane: Western Wabigoon

Belt: Eagle-Wabigoon-Manitou

Geological Age: Precambrian  

Lithology

Mineralization

Mineralization Comments

Apr 30, 2020 (C Ravnaas) - The occurrence is underlain by mafic metavolcanic rocks of the Blanchard Lake Group (Blackburn 1976, 1982). Two northeast-trending shear zones (here named the West and East Shear Zones) are intruded by carbonatized feldspar porphyry dikes. Shearing resulted in a highly schistose and altered rock. The alteration products and metamorphic minerals consist of chlorite, amphibole, biotite, carbonate, anthophyllite in rosettes, and sulphide minerals. The West Shear Zone strikes 050 and dips 55 degrees to the southeast, and is sub-parallel to the schistosity. The East Shear Zone, 100 m to the east, strikes 030 and dips 65 to the southeast, and rotation of the schistosity into the shear fabric suggests a sinistral oblique-slip sense of movement on this shear. The quartz-carbonate veins are white to light grey, semi translucent to translucent, and rarely cloudy to opaque. The quartz is fractured and contains ribbons and patches of chlorite, carbonate, and anthophyllite. Sulphides consist of pyrite, locally up to 5%, both in the quartz veins and in the wall rock. In the West Shear Zone, a minimum of four parallel quartz veins occur within a width of 25 m over a length of 80 m. The main vein, which dips to the southeast, has a width ranging from 1.5 m to 2.8 m, over a 35 m length. In the exploration pit, the footwall of the 2.7 m thick massive main vein is well mineralized. It consists of pyritized amphibole schist, with 10% pyrite over 50 cm and a stringer zone of unknown width in a silicified and pyritized amphibole schist, with 25-30% pyrite. The vein in the East Shear Zone, 100 m to the east, is traced by numerous trenches in overburden over a length of 335 m. The reader is referred to Thomson (1934, Figure 5) for a sketch of these trenches. Because the vein is not exposed, the writer was unable to investigate it in detail. Thomson (1934) indicated (Figure 5) another quartz vein 215 metres to the northeast of the West Shear Zone, but the author was unable to find this vein. This vein was the discovery vein. Thirteen grab samples were taken by the author, all from the westerly shear zone. The quartz from the vein at the shaft returned 4380 ppb gold on analysis. One of the five grab samples from the pyritized hornblende-mica calcite- plagioclase schist analysed 2090 ppb gold. (OFR 5731, p. 143-47; 1990).

Apr 30, 2020 (Therese Pettigrew) - Sample K087543 assayed 69.2 g/t Au from a quartz muck in the East Shear with visible gold and 1-2% pyrite (Assessment report 20000013536).

Mineral Record Details

References

Mono - Feasibility of small scale gold mining in northwestern Ontario (parts of the districts of Kenora, Rainy River, and Thunder Bay), volume 1, text, volume 2, appendices

Publication Number: OFR5332 Scale:     Date: 1981

Author: Neilson J.N., Bray R.C.E.

Publisher Name: Ontario Geological Survey

Location:

Mono - Property visits by the Dryden area mineral commodity geologist, 1989

Publication Number: OFR5731 Scale:     Date: 1990

Author: Delisle P.C.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology of the Straw-Manitou lakes area

Publication Number: ARV43-04 Scale:     Date: 1998

Author: Thomson J.E.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River

Publication Number: MDC016 Scale:     Date: 1976

Author: Beard R.C., Garratt G.L.

Publisher Name: Ontario Division of Mines

Location:

MonoMap - Geology of the Lower Manitou-Uphill lakes area, District of Kenora

Publication Number: R142 Scale:     Date: 1976

Author: Blackburn C.E.

Publisher Name: Ontario Division of Mines

Location:

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For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office