Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52N04SE00144

Record: MDI52N04SE00144

General

Mineral Record Identification
Record Name(s) Cordoba Mines DDH# 58-30,31 - 1958
Related Record Type Simple
Related Record(s)
Record Status Occurrence
Date Created 1991-Mar-12
Date Last Modified 2022-Aug-31
Created By
Revised By

Commodities

Primary Commodities: Copper

Secondary Commodities: Gold



Location

Township or Area: Balmer

Latitude: 51° 4' 12.43"    Longitude: -93° 38' 50.86"

UTM Zone: 15    Easting: 454636.624   Northing: 5657821.915    UTM Datum: NAD83

Resident Geologist District: Red Lake

NTS Grid: 52N04SE

Point Location Description: DDH 58-31 northeast of McDougal Lake on prelim map P.1976A

Location Method: Data Compilation



Exploration History

Pre-1954: Property held by 8 separate mining companies who performed surface work and drilled at least 70 drill holes totalling over 8400 m. 1954:C. Petersen and H. Pokholm drilled 3 holes totalling 98.8 m. 1955: Completed 8 drill holes totalling 280.6 m. 1956-1960: Cordoba Mines Ltd. performed an airborne magnetometer survey and drilled over 100 holes, no footage given. 1969-1983: Property was split up with 8 to 9 companies performing work. In this period at least 49 holes were drilled totalling over 6300 m, and several EM and magnetometer surveys were performed over various parts of the property.


Assessment Work on File

Assessment Work on File
Office File Number Online Assessment File Identifier Online Assessment File Directory
14 52N04SE0124 52N04SE0124

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Red Lake

Geological Age: Archean  

Metamorphism Type: Regional

Metamorphism Grade: Amphibolite



Geology Comments

Dec 07, 2005 (K R Kettles) - The Cordoba Property is primarily underlain by altered metavolcanic flows which strike NNW-SSE and dip steeply SW. Sulphide-bearing iron formation beds occur as interflow units. The iron formation units vary in thickness from a few metres up to a maximum of about 150 m, and some of the units have been traced for a strike length of over 3500 m. Locally, the iron formation units are contorted and brecciated, with quartz-carbonate and massive sulphide (generally pyrrhotite) veins filling fractures. Numerous mafic to felsic dikes have been observed on the property. Mineralization occurs in the sulphide rich sections of the oxide facies iron formation. Most of the EM and magnetometer anomalies have been recognized as iron formation units.




Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Sulphide Ironstone 1 Sulphide-Oxide Iron Formation Host
Mafic lava flow-unsubdivided 2 Altered Flows Adjacent

Lithology Comments

Dec 07, 2005 (K R Kettles) - The iron formation units are oxide facies, and up to 18 m in thickness, and contain sulphide rich sections.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1ChalcopyriteEconomicOre
2MagnetiteEconomicOre
3PyriteEconomicOre
4PyrrhotiteEconomicOre
5GoldEconomicOre
1ChertEconomicGangue
CarbonateAlterationCarbonatization1
SilicaAlterationSilicification2
BiotiteAlterationBiotitic3

Mineralization Comments

Dec 07, 2005 (K R Kettles) - Several oxide facies iron formation units , up to 18 m in thickness, were intersected in drill holes #58-30 and #58-31. Sulphide rich sections containing pyrite, chalcopyrite, and pyrrhotite contain only low gold values. Assay results indicate the iron formation contains only very low gold values but interesting copper values. The results are: 5.56% Cu/0.98 m; 0.53% Cu/1.95 m; 1.03% Cu/ 0.76 m; and 1.14% Cu/0.61 m.



Alteration Comments

Dec 07, 2005 (K R Kettles) - The mafic metavolcanic rocks are carbonatized and silicified, and are locally biotitic, and garnetiferous.




Mineral Record Details

References

Map - Geological series, Balmer Township, District of Kenora (Patricia Portion)

Publication Number: P1976A Scale: 1:12,000    Date: 1978

Author: Pirie J., Grant A.

Publisher Name: Ontario Geological Survey

Location:


File - Red Lake Resident Geologists Files 1985 Balmer #113, 116

Publication Number: AF RL 1985 Date: 1985

Author:

Publisher Name:

Location: Red Lake RGP


Mono - Gold occurrences, prospects, and deposits of the Red Lake area, volumes 1 and 2

Publication Number: OFR5558 Page: 232-233  Date: 1987

Author: Durocher M.E., Burchell P.S., Andrews A.J.

Publisher Name: Ontario Geological Survey

Location:


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