Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41N10NW00007

Record: MDI41N10NW00007

General

Mineral Record Identification
Record Name(s)	Lost Gacie Occurrence - 1898, Quinlan-Montgomery Property - 1954
Related Record Type	Simple
Related Record(s)
Record Status	Occurrence
Date Created	1980-Jul-11
Date Last Modified	2022-Sep-06
Created By
Revised By

Commodities

Primary Commodities: Copper

Location

Township or Area: Tiernan

Latitude: 47° 39' 31.86" Longitude: -84° 47' 52.16"

UTM Zone: 16 Easting: 665348.88 Northing: 5280733.34 UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 41N10NW

Point Location Description: Shaft symbol on map 2138

Location Method: Conversion from MDI

Access Description: The shafts and trenches are accessible from the road to the Gamitagama Lake microwave towers. Permission to access this road is required from the Park Superintendent at Lake Superior Provincial Park.

Exploration History

1870's: discovery of chalcopyrite-bearing veins by T. Frechette. pre 1906 - 2 shafts (15 feet and 10 feet deep), pits and trenches. 1906 - patenting of claims. 1954: Quinlan-Montgomery: sampling.

Assessment Work on File

Assessment Work on File
Office File Number	Online Assessment File Identifier	Online Assessment File Directory
Barager-0010	41N10NE0011	41N10NE0011
ASSELIN 21	41N10NE0005	41N10NE0005

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Gamitagama

Geological Age: Mesoproterozoic Geochronological Age: 1.10 MA Geochron. Age Ref.: GOO VOL 1

Metamorphism Type: Contact

Metamorphism Grade: Hornfels

Geology Comments

Dec 07, 2005 (A Wilson) - The property is underlain by olivine gabbro, olivine,norite, gabbro, norite and pyroxene diorite of the Gamitagama Lake Complex, but biotite-hornblende diorite, tonalite, syenodiorite, trondhjemite, granodiorite and monzonite of the complex, and hornfelsed mafic metavolcanic and metasedimentary country rocks are also present. THe veins are in the contact metamorphic aureole of the Gamitagama Lake Complex. The Gamitagama Lake Fault hosts the veins of the occurrence.

Lithology

Lithology Data
Rock Type	Rank	Composition	Relationship
Mafic Hornfels	1	Hornfelsed	Near
Granodiorite	2		Near
Vein	3	Quartz	Host

Lithology Comments

Dec 07, 2005 (A Wilson) - The veins lie in the contact metamorphic aureole of the Gamitagama Lake Complex. Mafic metavolcanic rocks are metamorphosed to the upper part of the hornblende hornfels facies are intruded by small masses of tonalite and granodiorite. Several hundred feet of displacement have occurred along the east-trending Gamitagama Lake Fault.

Mineralization

Mineralization and Alteration
Rank	Mineral Name	Class	Economic Mineral Type	Alteration Mineral Type	Alteration Ranking	Alteration Intensity	Alteration Style
1	Chalcopyrite	Economic	Ore
1	Pyrite	Economic	Gangue

Mineralization Comments

Dec 07, 2005 (A Wilson) - A quartz vein fills an easterly-trending brecciated zone within the Gamitagama Lake Fault. The vein pinches and swells along its length. Five grab samples were collected from the vein by the ODM in 1957. They assayed: 2.64% Cu, 0.38% Cu, 0.1% Cu, 0.06% Cu and 0.08% Cu. All samples returned trace to nil gold. The best analyses came from samples taken near the No. 1 shaft (easternmost shaft).

Mineral Record Details

Classification
Rank	Classification
1	Hydrothermal

Characteristics
Rank	Characteristic
1	Fault
2	Vein

Mineral Zones - Size and Shape

Rank: 2 Structure Type: Fault

Rank: 1 Structure Type: Vein

Zone Name: Detour Lake - Rank 1
Shape	Length	Thickness	Depth	Strike	Dip	Plunge	Trend	Age	Reference
Regular	213	2.5		270	75