Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000000922

Record: MDI000000000922

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Contact Bay Area

Latitude: 49° 41' 21.55"    Longitude: -92° 47' 58.68"

UTM Zone: 15    Easting: 514452   Northing: 5504108    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F10NW

Point Location Description: From AMIS database

Location Method: Based on Assessment

Access Description: The occurrence is accessible by water.

Exploration History

1917: 2 shafts sunk to 8 and 11 m on a 1.5 m wide quartz vein. 1990: Grand Oakes Exploration Inc. conducted magnetic and EM surveys. 2003: Atikwa Minerals Ltd. conducted geological mapping, prospecting, trenching and sampling.

Assessment Work on File

Geology

Province: Superior

Geological Age: Precambrian  

Geology Comments

Nov 02, 2010 (J Bongfelt) - The occurrence is underlain by felsic and mafic metavolcanic flows and pyroclastics of the Lower Wabigoon Volcanics which are intruded by felsic dikes. The occurrence is approximately l km north of the contact between the Atikwa Batholith and the metavolcanics, and l km west of the contact between the Mile Lake Gabbro and the metavolcanics. (OFR 5723, p.191)

Lithology

Lithology Comments

Nov 02, 2010 (J Bongfelt) - The 'main' shaft and a number of shallow test pits have been sunk on tension fracture and shear zone hosted quartz veins. The host rock is a felsic quartz-feldspar crystal tuff which is fine-grained, well foliated to massive, and pale grey to buff brown containing small [? 3 mm], irregular crystal shards of quartz and feldspar. The wall rocks are sericitized, chloritized and weakly carbonatized. The main quartz vein at the shaft is located in a narrow shear zone striking 325º/70º NE for approximately 75 m. A narrow flat-lying vein is situated on the south side of the shaft. The main quartz vein consists of white, 'sugary', quartz containing abundant dark green chlorite, irregular xenoliths of wall rock, and < 2% disseminated pyrite with minor chalcopyrite and sphalerite. The vein also contains extremely chloritic and biotitic mafic xenoliths. The immediate wall rocks and quartz veins contain abundant hematite and red hematite staining. Other quartz veins in the vicinity of the shaft consist of vitreous white quartz with rusty orange staining and strike 347º/90º. Narrow quartz veins in shallow test pits east of the shaft appear to strike between 320º to 340º. Numerous flat-lying or shallow dipping veins occur in some of the test pits. The second shaft and test pit located on the south side of a small peninsula, south of the "main" shaft, have been sunk on fracture-hosted quartz veins in massive, mafic, metavolcanic flows. The mafic metavolcanics are dark gray-green to black and amphibolitized containing biotite and actinolite. Quartz veins consist of white, gray, and translucent quartz containing chlorite, wall rock xenoliths, abundant crystalline calcite, very minor pyrite and chalcopyrite, and coarse blebs of visible gold. The wall rocks, next to the veins, are tourmalinized, weakly carbonatized, and contain abundant disseminated arsenopyrite. Felsic metavolcanics on the west shore of Mile Lake, east of the E.D.B. l Occurrence, consist of massive, aphanitic, rhyolite flows and feldspar porphyry which have been carbonatized and sericitized. The outcrops are covered with abundant rusty gossan and hematite staining due to approximately 1% fine-grained, pyrite disseminated throughout the metavolcanics. Narrow, north-trending quartz veins are hosted by shears and tension fractures and consist of vitreous white and gray quartz containing abundant dark green chlorite, hematite, and malachite. A number of small, shallow pits have been sunk on the quartz veins. (OFR 5723, p.191-192)

Mineralization

Mineralization Comments

Nov 02, 2010 (J Bongfelt) - - A grab sample from the quartz vein at the "main" shaft, taken by the author, assayed 735 ppb gold, while a sample of the wall rock assayed 110 ppb gold. - Two grab samples taken by the author from a quartz vein in a shallow test pit 15 m south of the "main" shaft assayed 115 and 640 ppb gold. - A grab sample of quartz vein material taken by the author from the dump at the second shaft assayed 400 ppb gold and 1700 ppm arsenic. (OFR 5723, p.192)

Nov 24, 2017 (Therese Pettigrew) - Samples collected from a quartz vein containing visible gold (location: Zone 15, 514523 m E, 5504359 m N) returned assays of 200-1091 ppb Au (AFRI 52F10NW2006).

Mineral Record Details

References

Mono - Geology, gold mineralization and property visits in the area investigated by the Dryden-Ignace economic geologist, 1984-1987

Publication Number: OFR5723 Scale:     Date: 1989

Author: Parker J.R.

Publisher Name: Ontario Geological Survey

Location:

Journal - Kenora Property File 52F/10NW - E.D.B. 1 Mine

Publication Number: Scale:     Date: 2010

Author:

Publisher Name:

Location: Kenora Geology Office Only

Part - Mines of Ontario

Publication Number: ARV26.003 Scale:     Date: 1998

Author: Sutherland T.F., Collins E.A., Stovel J.H., Bartlett J.

Publisher Name: Ontario Bureau of Mines

Location:

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