Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52E10SW00013

Record: MDI52E10SW00013

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Glass

Latitude: 49° 34' 35.64"    Longitude: -94° 58' 27.12"

UTM Zone: 15    Easting: 357280.56   Northing: 5493425.26    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52E10SW

Point Location Description: Precise

Location Method: Conversion from MDI

Exploration History

1896: Gold was discovered, and the property sold to the Yum Yum Gold Mining Company. 1897-1900: prospecting, trenching, pitting, open cutting, shaft sinking, and at least 320 m of diamond drilling. 1961: A. Hopkins carried out mapping.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Geological Age: Archean  

Lithology

Lithology Comments

Jan 15, 2020 (Therese Pettigrew) - The area is on the southeastern limb of the Gull Bay - Bag Bay Anticline, approximately half way between the axial trace and the top of the lower mafic volcanic sequence. The land between Perido and Yum Yum Bays, often referred to as Yum Yum Peninsula, is mainly underlain by gabbro and anorthosite gabbro which grades upward (southeastward) into amphibolite, similar to exposures on some islands to the southwest (Davies, 1978). Peridotite lies stratigraphically beneath the gabbro, but it has not been ascertained whether this is a separate flow or sill, or the differentiated base of a 325 m thick sill. Overlying the amphibolite are 5 to 10 m of fractured, massive to foliated basalt, which coincides with the steep southeast slope of the gabbro-amphibolite hills. Southeast of the basalt is strongly jointed, very fine-grained rhyolite, devoid of primary features but considered to be extrusive. The northern end of Yum Yum Bay coincides with a 115 degree-trending lineament. North of this lineament and within the Yum Yum property, the outcrop is almost entirely fine- to medium-grained basalt, and a major fault has been interpreted to coincide with the lineament. There are numerous shear zones parallel to this trend but, where the strongest lineaments are projected to cross outcrop areas, there is no clear evidence of significant movement. This had led to the interpretation that the major movement has occurred along a generally east-trending fault. On the assumption that rhyolite lies beneath the northern arm of Helldiver Bay (Davies 1978), and that this is correlative with the Yum Yum rhyolite, dextral movement is indicated, with an apparent horizontal component of about 600 m (Davies and Smith, 1988).

Mineralization

Mineralization Comments

Jan 15, 2020 (C Ravnaas) - In samples collected by Davies and Smith (1988), the No. 1 vein returned 165 ppm Au, 25 ppm Sb, 690 ppm Cu, and 195 ppm Zn from a felsite quartz. The No. 2 vein returned up to 1240 ppb Au, 58 ppm As, 620 ppm Cr, 275 ppm Mo, and 500 ppm W from quartz and an altered basalt. The No. 3 vein returned 255 ppb Au from a felsite and >10 ppm Au, 470 ppm As, 570 ppm Cr, 400 ppm Cu, 160 ppm Zn, and 1200 ppm B from a quartz in schist.

Jan 15, 2020 (Therese Pettigrew) - Seven veins and small stringers assayed 0.94 to 1.0 oz/t Au. The No. 3 vein is 2 to 5 feet (0.6 to 1.5 m) wide by 0.5 miles (0.8 km) long (Beard and Garratt, 1984). Most of the gold occurrences on the property lie on or close to WNW-trending lineaments (Davies, 1978). Vein No. 1, according to information given to Bow (1898), is at the northeastern end of the location and can be traced over most of the property and onto the property to the north. It consists of 45 to 150 cm of quartz and felsite, is "heavily mineralized", and contains sphalerite. This is believed to be the "Joe Vein" reported to contain "considerable free gold" and on which two pits, 5 and 6 m, were sunk (Coleman, 1898). It may also be the "Indian Joe Vein", on which a 13.7 m shaft was sunk and where a second shaft was begun "where a small rich stringer of quartz was contained in the felsite" (Bow and DeKalb, 1900). At present, this vein is best exposed in a hillside cut near the north-central edge of the property. Here, the 2 m wide cut is entirely in felsite, which is fine-grained and locally contains up to 3% pyrite. Two shallow trenches expose the felsite. Felsite was also located about 200 m ESE of the cut and it is possible that the zone was intermittently exposed over this length in 1898. Vein No. 2 was reported to have been "traced across the location" (Bow 1898), to have a width of up to about 1 m, to consist of quartz, and to have been exposed in an open cut, a 6 m pit and several trenches. During OGS staff’s 1988 study, a series of workings which may be the No. 2 Zone, was located over a length of 300 m. In an 8 m long open cut at the eastern end, chlorite-mica schist defines a southeast- striking, steeply northeast-dipping, narrow shear zone within which is a sinuous quartz vein up to 6 cm thick. The quartz is sugary and white and contains traces of pyrite. The footwall schist contains up to 5% pyrite, but the hanging wall is essentially barren. Almost 200 m to the WNW is a second open cut of similar size; pyrite is disseminated in the schist and the quartz is locally thicker, but the quartz branches and lenses out. Between the two open cuts are several small pits and trenches, but they expose very little quartz. About 120 m further WNW, a schistose zone at least 1.2 m wide strikes 120 degrees and dips steeply south, but a quartz vein up to 60 cm wide is very irregular and appears to strike about 150 degrees. Pyrite is present in both the quartz and the chloritic schist (Davies and Smith, 1988). Vein No. 3 was reported to be one of the best on the property and to be traceable over 800 m (Bow 1898). Its principal exposure is in a SE-trending, 20 m long open cut that is 8 m wide at the face. Here an irregular felsite dike with a width of about 1 m lies in a fracture zone in altered, medium-grained basalt. The felsite contains up to 10% fine pyrite near the northern side. There are numerous small quartz-carbonate stringers in the altered zone. North of the open cut, a vertical shaft was sunk; a drill hole had intersected quartz about 16.7 m below the open cut, and it had been planned to sink the shaft to a depth of 36.5 m before crosscutting and stoping (Bow 1898). The shaft reached a depth of 26 m (Beard and Garratt 1976). No. 4 vein was reported by Bow (1898) to trend northwest and to consist of up to 60 cm of quartz and schist exposed in a pit and 2 trenches. The zone was well mineralized, with assays of 0.85 to 0.90 oz Au/ton, but was considered to be of little importance because it could not be traced very far. No. 5 vein was reported to be up to 3 m wide and to be traceable over 800 m (Coleman 1898) onto the Ontario Ltd. property to the west (Bow 1898). Vein G and Vein H were reported to occur in the northwestern part of the property, to strike northeast, and to have been traced a short distance (Bow 1898).

Mineral Record Details

References

MonoMap - Geology of the Shoal Lake-Western Peninsula area, District of Kenora

Publication Number: OFR5242 Scale:     Date: 1978

Author: Davies J.C.

Publisher Name: Ontario Geological Survey

Location:

Part - Mines of northwestern Ontario

Publication Number: ARV07-01.003 Scale:     Date: 1998

Author: Bow J.A.

Publisher Name: Ontario Bureau of Mines

Location:

Mono - The geological setting of gold occurrences in the Lake of the Woods area

Publication Number: OFR5695 Scale:     Date: 1988

Author: Davies J.C., Smith P.M.

Publisher Name: Ontario Geological Survey

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:

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