Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42F04SE00008

Record: MDI42F04SE00008

General

Mineral Record Identification
Record Name(s)	Ice Cream Lake Road Copper Occurrence - 1991
Related Record Type	Simple
Related Record(s)
Record Status	Occurrence
Date Created	1996-Dec-19
Date Last Modified	2023-Aug-03
Created By
Revised By

Commodities

Primary Commodities: Copper

Secondary Commodities: Gold, Zinc, Nickel

Location

Township or Area: Cecil

Latitude: 49° 5' 41.54" Longitude: -85° 35' 41.78"

UTM Zone: 16 Easting: 602573 Northing: 5438953 UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42F04SE

Point Location Description: Outcrop description from OFR5906 p. 340

Location Method: Field Visit

Access Description: The Ice Cream Lake road copper occurrence is located in Cecil Township approximately 18 km east-southeastof Manitouwadge and 1.5 km south-southeast of the south end of Rawluk Lake. The occurrence is accessible via motor vehicle. From Manitouwadge, proceed east along the Camp 70 logging road for approximately 4.25 km to the Twist Lake road. Proceed south and east along the Twist Lake road for approximately 14 km to the Ice Cream Lake road. Proceed east along the Ice Cream Lake road for approximately 1.6 km to the vicinity of the occurrence. Sulphide mineralization occurs within several large, angular boulders and scattered outcrops located approximately 25 m north of the road.

Exploration History

1964-1965: Geological mapping; V.G. Milne (ODM). 1967: Geological maping; J. F. Giguere (ODM). 1978: Regional lake sediment and water geochemical survey; GSC-MNR. Samples collected from lakes in the vicinity of the occurrence did not contain anomalous amounts of gold nor base metals. 1989: Geological mapping; H. Williams and F. Breaks (OGS). Noranda Exploration Company, Limited and Noranda Minerals Inc. (Geco Division) flew a Dighem airborne geophysical survey (EM, MAG, VLF-EM). 1990: Geological mapping; D. Nicol (Lakehead University). 1991: Reconnaissance till sampling program; I.M. Kettles (GSC). Samples collected in the vicinity of the occurrence did not contain anomalous amounts of gold nor base metals. 1991-1992: Lithogeochemical sampling; D.B. McKay (OGS).

Assessment Work on File

Assessment Work on File
Office File Number	Online Assessment File Identifier	Online Assessment File Directory
2.13114	42F04SW0010	42F04SW0010

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Geological Age: Archean

Geology Comments

Dec 07, 2005 (D McKay) - The occurrence is located within the Wawa subprovince and is underlain primarily by coarse-grained melagabbroic rocks of the Faries Lake-Moshkinabi Lake mafic intrusive complex (Williams and Breaks 1989, 1990). The Faries Lake-Moshkinabi Lake complex consists of a layered suite of gabbro, leucogabbro, anorthosite and peridotite (Williams and Breaks 1989). A late-stage dioritic body has intruded the Faries Lake-Moshkinabi Lake complex approximately 1.5 km north of the occurrence (Williams and Breaks 1990). The melagabbroic rocks hosting the occurrence may constitute the marginal phases of this dioritic body. As noted by Williams and Breaks (1989, 1990), the mafic and ultramafic rocks in the vicinity of the occurrence have the potential to host copper, nickel, chromium and platinum-group element mineralization.

Lithology

Lithology Data
Rock Type	Rank	Composition	Texture	Relationship
Gabbro	1	Melagabbro		Host

Lithology Comments

Dec 07, 2005 (D McKay) - The occurrence consists of irregularly-distributed sulphide mineralization hosted in very coarse-grained (individual crystals up to 2 cm across), locally rusty-weathering, massive, non-magnetic melagabbro. The melagabbro is locally brecciated and contains skeletal amphiboles suggestive of magma mixing.

Mineralization

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

Mineralization Comments

Dec 07, 2005 (D McKay) - Pyrite and chalcopyrite occur as medium-grained, subhedral to euhedral, disseminated grains and localized coarse-grained patches. The sulphides generally constitute less than 1% of the melagabbro, but concentrations of up to 3% occur locally. A grab sample of very coarse-grained, pyritic melagabbro collected from the occurrence in 1991 by D. B. McKay for the OGS returned assay values of 0.019 ounce Au per ton, 0.39 ounce Ag per ton, 0.47% Cu, 510 ppm Zn, 481 ppm Ni, 15 ppb Pd and <1 ppb Pt. A grab sample of coarse-grained, pyritic melagabbro reportedly collected approximately 1 km north-northeast of the occurrence by prospector K. Preston, and submitted to the MNDM for analysis in 1991, returned assay values of 0.58% Cu, 288 ppm Ni, 2690 ppb Pd and 300 ppb Pt. A brief reconnaissance in the area by MNDM staff failed to locate the source of this sample.

Mineral Record Details

Classification
Rank	Classification
1	Magmatic

Characteristics
Rank	Characteristic
1	Disseminated

References

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Geology of the Manitouwadge-Hornepayne area

Publication Number: OFM0142 Scale: 1:50,000 Date: 1990

Author: Williams H.R., Breaks F.W.