Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E12SE00003

Record: MDI42E12SE00003

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Iron

Location

Township or Area: Vincent

Latitude: 49° 38' 42.42"    Longitude: -87° 38' 48.65"

UTM Zone: 16    Easting: 453302.166   Northing: 5499375.195    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E12SE

Point Location Description: Trenches.

Location Method: Conversion from MDI

Access Description: The occurrence is located in northeastern Vincent Township, approximately 1 km north of Clist Lake. Access is via a trail that commences on the east side of Nezah Lake, east of the Canadian National Railway bridge.

Exploration History

1928: The Dalton brothers held the property. 1936: Greenlee Gold Mines Limited took over the Dalton claims. Trenching was conducted on two iron formations and the claims were brought to lease. 1984: The Dalton estate controls the property which consists of 15 leased claims.

Geology

Province: Superior

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - A sequence of east-trending mafic volcanic rocks (South Metavolcanic Sub-belt) approximately 3 km wide is bounded on the north and south by a sequence of turbidites. The mafic volcanics are primarily basalt to andesite, minor tuff and ultramafic flows. East trending ironstone units (chemical metasediments) occur in tuffaceous metasediments within the volcanic rocks. Ironstones are generally up to 2 m thick and consist of alternating bands of magnetite, hematite, recrystallized chert, and grunerite. Bands range from 4 to 10 mm thick. The mafic metavolcanics are intruded by lensoid northeasterly-trending, medium to coarse grained metagabbroic plugs up to 800 m long and 100 m wide. Narrow quartz-feldspar porphyry and porphyry dykes and sheets intrude the metavolcanics. Two iron formation units are exposed on the property. One is 10 m wide, the other 7 m wide. They are separated by 106 m of lava. Both are contorted and in places are fractured. The fractures are filled with quartz mineralized with po, py, cp and some asp. Gold is confined to the areas of secondary minerals. The feldspar-porphyry dyke cuts the quartz vein. Gold content is rather low and erratic. In addition to the gold-bearing zones in the iron formation, a north-south quartz vein has been uncovered. It lies entirely in greenstone. The quartz in this vein has an indistinct banded structure parallel to the walls. A little galena is present, and gold is reported to occur in those parts where there is galena.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - Carter (1983) described the flows as being 15 to 25 m thick and dark green to greenish black. The flows in the southern belt can exhibit a massive to weakly foliated medium-grained basal part, a finer-grained middle portion and a fine-grained to aphanitic upper part which is commonly pillowed, amygdaloidal and/or variolitic.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - Usually the sulphides are sparingly disseminated, but in places pyrrhotite is present in masses a foot in diameter. In most places it occurs as narrow lenses along the bedding of the iron formation. Gold is confined to the areas of secondary minerals. Samples taken in 1984 returned the following assays: 84-MWD-3: 1.1% As, 1 ppm Sb, 340 ppm Au; 84-MWD-8: 78 ppm As, 0.5 ppm Sb, 60 ppm Au; 84-MWD-9: 23 ppm As, 0.4 ppm Sb, 280 ppm Au.

Mineral Record Details

Site Visit Information

Date: Dec 31, 1996

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited this occurrence July 11, 1984.

References

File - Resident Geologist files AFRO 1928, correspondence

Publication Number: Date: 1928

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Beardmore-Nezah gold area, District of Thunder Bay, Ontario

Publication Number: ARM37K Scale: 1:63,360    Date: 1998

Author: Langford G.B.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts

Publication Number: M2102 Date: 1997

Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological series, Precambrian geology, Vincent Township, District of Thunder Bay

Publication Number: P2854 Scale: 1:15,840    Date: 1985

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Mono - Preliminary report on the geology of the Blackwater-Beardmore area

Publication Number: PR1951-07 Date: 1998

Author: Peach P.A.

Publisher Name: Ontario Dept. of Mines

Location:

Article - McComber and Vincent townships, District of Thunder Bay

Publication Number: MP116.007 Page: 32-36  Date: 1997

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

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

Publication Number: OFR5630 Date: 1986

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

Publisher Name: Ontario Geological Survey

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Part - Geology of the Beardmore-Nezah gold area, District of Thunder Bay

Publication Number: ARV37-04.003 Date: 1998

Author: Langford G.B.

Publisher Name: Ontario Dept. of Mines

Location:

Report an Error

We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.

Terms of Use

Please review our Terms of Use agreement for this data product.

Ministry Contact Information

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