Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42B01SW00011

Record: MDI42B01SW00011

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper

Location

Township or Area: Horwood

Latitude: 48° 0' 50.58"    Longitude: -82° 20' 5.85"

UTM Zone: 17    Easting: 400446.083   Northing: 5318724.002    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42B01SW

Point Location Description: Series of closely spaced north - south trenches on north shore of small peninsula.

Location Method: Field Visit with GPS

Access Description: The occurrence is located on the west shore of Horwood Lake and access is very easy via boat from a landing at the north end of Horwood Lake.

Exploration History

1933 The ground was originally staked by C.E. O'Neil who was exploring for gold mineralization hosted in a north south quartz vein. The work carried out consisted of extensive pitting and some gold values were reportedly obtained. 1974 Noranda Exploration carried out a detailed Vertical Loop EM and magnetic survey over the showing 1982 Gold Fields Mining Corporation carried out a ground VLF-EM and magnetic survey over the area and defined two northeast trending shear zones. This work was followed up with geological mapping program which defined two zones of carbonate alteration at Pinecone Point and a humus geochemical survey which also identified the same zones. 1987 St Joe Canada drilled six holes to follow up on the work by Goldfields, but their results were generally discouraging.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Swayze

Geological Age: Neoarchean   Geochronological Age: 2700 MA   Geochron. Age Ref.: GOO VOL 1

Metamorphism Type: Regional

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (S Fumerton) - There are some small folds in the quartz veins in the northern zone. These folds plunge down dip which is at a shallow angle to the north (10 degrees) compared to the reported steep dip to the whole zone.

Lithology

Lithology Comments

Dec 07, 2005 (S Fumerton) - The rocks in the area are predominantly mafic flows which have been intruded by small stocks of diorite and numerous thin felsic sills. Associated with the dioritic rocks are two zones of carbonate alteration with minor quartz veining trending southeast. The southern zone also has some quartz - tourmaline veins and sericite alteration. The northern zone which was examined is hosted in fine grained mafic metavolcanics adjacent to a coarse grained flow.

Mineralization

Mineralization Comments

Dec 07, 2005 (S Fumerton) - Pyrite is disseminated throughout the alteration zones whereas the distribution of chalcopyrite is more irregular and tends to be concentrated into bands together with pyrite. Together both sulphides can form up to 5% of the rock but typically form less than 2% of the rock. The best gold values are associated with zones of increased deformation and alteration combined with quartz stringers but even so the gold values are still less than 1 g/tonne. The northern zone normally consists of a 10 to 20cm banded quartz vein which is very coarse grained but may be up to 1m thick. No sulphides were observed in the vein. In the mafic flows adjacent to the quartz veins pyrite is abundant especially where the veins are folded. This sulphide enrichment extends for 1m from the vein. There are two types of pyrite, a coarser subhedral variety and a finer disseminated anhedral variety.

Assay Samples

Mineral Record Details

Mineral Zones - Size and Shape

Site Visit Information

Date: Jul 24, 1992

Geologist: S Fumerton

Notes: A set of trenches along northern zone were examined and sampled.

References

Map - Horwood Lake, Sudbury District

Publication Number: M2329 Scale: 1:31,680    Date: 1975

Author: Breaks F.W.

Publisher Name: Ontario Division of Mines

Location:

Book - FINACIAL SURVEY OF MINES 1947, P241

Publication Number: N/A Date: 1947

Author:

Publisher Name:

Location: Timmins RGP

Publication - Sudbury Timmins Algoma Mineral Program, Project 1: mineral inventory of the Sudbury-Timmins-Sault Ste. Marie region, Ontario

Publication Number: GSC OF 1087 Date: 1985

Author: Rose, D.G.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/129999

Part - Geology of the Horwood Lake area

Publication Number: ARV46-02 Page: 29-30  Date: 1997

Author: Harding W.D.

Publisher Name: Ontario Dept. of Mines

Location:

File - Resident Geologist files 1946, air photo

Publication Number: Date: 1996

Author:

Publisher Name:

Location:

MonoMap - Geology of the Chapleau area, districts of Algoma, Sudbury, and Cochrane

Publication Number: R157 Date: 1977

Author: Thurston P.C., Siragusa G.M., Sage R.P.

Publisher Name: Ontario Division of Mines

Location:

Mono - Gold deposits of Ontario, part 2, part of District of Cochrane, districts of Muskoka, Nipissing, Parry Sound, Sudbury, Timiskaming, and counties of southern Ontario

Publication Number: MDC018 Page: 105  Date: 1979

Author: Gordon J.B., Lovell H.L., de Grijs J.W., Davie R.F.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Mineral Prospects of the Swayze Greenstone Belt (Volume 1, Parts of NTS 41 O and Volume 2, Parts of NTS 41 P, 42 A and 42 B)

Publication Number: OFR5912 Page: 611-613  Date: 1995

Author: Fumerton S.L., Houle K.A.

Publisher Name: Ontario Geological Survey

Location:

Book - Horwood Township - unpublished GDIF

Publication Number: GDIF Date: 1990

Author: Resident Geologist Staff

Publisher Name:

Location: Timmins RGP

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