Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52A06NE00005

Record: MDI52A06NE00005

General

Mineral Record Identification
Record Name(s) Thunder Bay Silver - 1866
Related Record Type Simple
Related Record(s)
Record Status Developed Prospect Without Reported Reserves or Resources
Date Created 1979-Aug-13
Date Last Modified 2022-Apr-26
Created By
Revised By

Commodities

Primary Commodities: Silver

Secondary Commodities: Copper, Zinc, Barite, Lead



Location

Township or Area: Macgregor

Latitude: 48° 29' 8.62"    Longitude: -89° 9' 47.96"

UTM Zone: 16    Easting: 340151.06   Northing: 5372549.41    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52A06NE

Point Location Description: General

Location Method: Conversion from MDI



Exploration History

1866: Discovered by P. McKellar. 1866-69: Work was carried out, including underground development and mining. 1874: Mine was in operation for 6 months. Workings consist of 4 shafts sunk on a composite vein, a crosscut driven NW on the 60 foot level, and some drifting between shafts No. 1 and 2. No. 1 and No. 2 shafts were sunk 70 feet, No. 3 shaft 35 feet, and No. 4 shaft 25 feet. No assessment files were found on record.


Geology

Province: Southern

Formation Group: Animikie Group

Geological Age: Paleoproterozoic  



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Terrigenous-Clastic-Unsubdivided 1 Adjacent
Vein 2 Host
Diabase 3 Diabase Sill Near

Lithology Comments

Jun 20, 2018 (Therese Pettigrew) - The host rock of the veins consists of Animikie cherty carbonate of the Gunflint formation and black shales that strike N34 E and dip 22 degrees SE in the vicinity of the vein but subhorizontally 30.5 m NW beneath a diabase sill 12.2 m thick. A 3 m wide composite vein or stockwork of up to 2.5 cm wide veinlets lies within and parallel to a fault that also strikes N34E and dips 65 degrees NW.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1SilverEconomicOre
2ArgentiteEconomicOre
3GalenaEconomicOre
4SphaleriteEconomicOre
5PyriteEconomicOre
6BariteEconomicOre
7ChalcopyriteEconomicOre
8FluoriteEconomicOre
1QuartzEconomicGangue
2CalciteEconomicGangue

Mineralization Comments

Jun 20, 2018 (Therese Pettigrew) - Ore was mined locally over the total length of 182.9 m. Native silver and argentite occurred in pockets 7.6-45.7 cm thick by 1.8-12.2 m in length, the silver being in leaves and grains irregularly distributed in a gangue of quartz, with some calcite, galena, sphalerite, and pyrite. A second vein of calcite occurs in a parallel fault 6.1 m SE of the composite vein (Sergiades, 1968).



Mineral Record Details

Classification
RankClassification            
1 Vein
Characteristics
Rank Characteristic            
1 Vein
Production Data
Year Tonnes Commodities Reference Comment
1911 181 Silver 16000 Ounces
Sergiades, 1968, p. 67, and Thunder Bay RGP mineral deposit files Approx. 200 tons of low-grade ore from the first works of the mine were hauled to the company’s mill. At the second closing of the mine, the manager had the ore hauled to his own mill. The actual yield was not made known. The Ontario Bureau of Mines, v. 19, part 2, p. 208, estimated that the value of silver ore produced was $20,000 from about 16,000 oz of silver.

References

Map - Geological series, Precambrian geology, MacGregor Township, east half, District of Thunder Bay

Publication Number: P2985 Scale: 1:15,840    Date: 1986

Author: Scott J.F., Sequin J.M.

Publisher Name: Ontario Geological Survey

Location:


Mono - Silver cobalt calcite vein deposits of Ontario

Publication Number: MDC010 Page: 67  Date: 1968

Author: Sergiades A.O.

Publisher Name: Ontario Dept. of Mines

Location:


Publication - Fort William and Port Arthur, and Thunder Cape Map-area, Thunder Bay District, Ontario; Geological Survey of Canada, Memoir 167

Publication Number: GSC Memoir 167 Page: 155-156  Date: 1931

Author: Tanton, T.L.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/100799


Article - MacGregor Township, District of Thunder Bay

Publication Number: MP119.008 Page: 46-48  Date: 1997

Author: Scott J.F.

Publisher Name: Ontario Geological Survey

Location:


Part - The cobalt-nickel arsenides and silver deposits of Temiskaming (Cobalt and adjacent areas), chapters 1, 2 and 3

Publication Number: ARV19-02.001 Page: 208  Date: 1998

Author: Miller W.G., Burrows A.G., Hore R.E., DeLury J.S., Knight C.W., Stewart R.B., Collins W.H.

Publisher Name: Ontario Bureau 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 South Resident Geologist District Office