Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52A04NE00003

Record: MDI52A04NE00003

General

Mineral Record Identification
Record Name(s) Ponka - 1969, Korpela Copper Occurrence - 1965
Related Record Type Simple
Related Record(s)
Record Status Occurrence
Date Created 1979-Aug-03
Date Last Modified 2023-Aug-03
Created By
Revised By

Commodities

Primary Commodities: Copper



Location

Township or Area: Pearson

Latitude: 48° 10' 36.6"    Longitude: -89° 41' 26.61"

UTM Zone: 16    Easting: 299979   Northing: 5339456    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 52A04NE

Point Location Description: Location description in SMDR file

Location Method: Conversion from MDI



Exploration History

Pre-1965: Pitting and trenching by unknown operators.


Geology

Province: Southern

Formation Group: Animikie Group

Geological Age: Paleoproterozoic  



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Anorthosite 1 Anorthosite Host
Gabbro 2 Gabbro
Mudstone 3 Shale

Lithology Comments

Mar 01, 2018 (Therese Pettigrew) - The area consists of rocks of the Animikie Rove Formation which have been intruded by numerous dykes, sills, etc. of Keweenawan age.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1ChalcopyriteEconomicOre
2PyriteEconomicOre

Mineralization Comments

Mar 01, 2018 (Therese Pettigrew) - Chalcopyrite and pyrite disseminated in anorthosite and concentrated in irregular segregations near the base of a diabase sill (Shklanka, 1969). Mineralization occurs in coarse-grained to very coarse-grained Late Precambrian anorthosite, which shows no effects of alteration and in places displays well-developed subophitic texture. The anorthosite, which may be a differentiated sill, is interrupted in places by small irregular blebs of gabbro. Mineralization consists of chalcopyrite and subordinate iron sulphides disseminated in the anorthosite and apparently concentrated in irregular segregations. Sulphides are molded on feldspars and appear to be primary. There are three showings. Showing No. 1 is about 457 m north of the SE corner of lot 18 and consists of chalcopyrite disseminated in anorthosite. Showing No. 2 is about 152 m west and 305 m north of the SE corner of Lot 18 and also exposes chalcopyrite disseminated in anorthosite. Showing No. 3, in lot 19 about 0.8 km west of showing No. 1, contained chalcopyrite in a small segregation in anorthosite. A grab sample from showing No. 1 is reported to have contained 1.7% Cu but to have a low nickel content. A grab sample from showing No. 3 contained 1.59% Cu. It is estimated that none of the showings would average better than 0.5% Cu (RGP Mineral Deposit files, Thunder Bay office).



Mineral Record Details

References

Mono - Copper, nickel, lead and zinc deposits of Ontario

Publication Number: MDC012 Page: 345  Date: 1969

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:


Article - Resident Geologist's Office, Port Arthur

Publication Number: PR1965-03.027 Page: 64  Date: 1997

Author: Pye E.G.

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 South Resident Geologist District Office