Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52A07SE00003

Record: MDI52A07SE00003

General

Mineral Record Identification
Record Name(s) Edward Island - 1884
Related Record Type Simple
Related Record(s)
Record Status Occurrence
Date Created 1980-Jan-24
Date Last Modified 2022-Apr-26
Created By
Revised By

Commodities

Primary Commodities: Silver

Secondary Commodities: Copper, Zinc, Lead



Location

Township or Area: Porphyry Island Area

Latitude: 48° 21' 22.05"    Longitude: -88° 38' 38.41"

UTM Zone: 16    Easting: 378213   Northing: 5357189    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52A07SE

Point Location Description: AMIS Shaft location

Location Method: Conversion from MDI



Exploration History

1884: Silver Islet Co. sank two shafts on the southwestern end of Edward Island. The No. 1 shaft was located on the beach and was sunk 10.7 m. The No. 2 shaft was located inland about 61 m to the NE and was sunk 30.5 m. 1921: D.C. Peacock dewatered the No. 1 shaft and extended it a few metres. 1963: Monarch Gold Mines optioned the property and carried out an EM survey and drilled 2 DDH totalling 396.2 m.


Assessment Work on File

Assessment Work on File
Office File Number Online Assessment File Identifier Online Assessment File Directory
10 52A07SE0001 52A07SE0001

Geology

Province: Southern

Formation Group: Animikie Group

Geological Age: Paleoproterozoic  



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Mafic lava flow-unsubdivided 1
Terrigenous-Clastic-Unsubdivided 2
Vein 3 Calcite Host

Lithology Comments

Mar 28, 2018 (Therese Pettigrew) - Mafic metavolcanics, locally 9.1 m thick, overlie calcareous quartz sandstone and red fragmental rock of the Osler Series. These rocks have been faulted and intruded by a system of NE Keweenawan diabase dykes. A major NE fault zone cuts all of these rocks; two minor nearly parallel faults within this zone are mineralized and each has been explored by a shaft. In the shaft No. 1 vein, native silver and argentite occur in a gangue of calcite; other minerals include: sphalerite, native arsenic chalcopyrite and galena. Vein No.2 is sparsely mineralized with galena, sphalerite and chalcopyrite (Sergiades, 1968).




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1ArgentiteEconomicOre
2ChalcopyriteEconomicOre
3GalenaEconomicOre
4SphaleriteEconomicOre
1CalciteEconomicGangue

Mineralization Comments

Mar 28, 2018 (Therese Pettigrew) - Ore taken from the No. 1 shaft assayed 80 opt Ag. The Shaft No. 1 vein strikes N and varies in width up to 0.3 m with branches and parallel veinlets extending to a width of 0.6 m on either side. The No. 2 Shaft vein strikes N and is of the composite type with a width of several metres (Sergiades, 1968).



Mineral Record Details

Classification
RankClassification            
1 Vein
Characteristics
Rank Characteristic            
1 Vein

References

Mono - Silver cobalt calcite vein deposits of Ontario

Publication Number: MDC010 Page: 73  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: 186-187  Date: 1931

Author: Tanton, T.L.

Publisher Name: Geological Survey of Canada

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


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Ministry Contact Information

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