Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41P12SW00040

Record: MDI41P12SW00040

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Chester

Latitude: 47° 32' 44.83"    Longitude: -81° 57' 20.25"

UTM Zone: 17    Easting: 428091.57   Northing: 5266260.69    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 41P12SW

Point Location Description: Flooded pit measuring 2x2x2m on a small island in Clam Lake

Location Method: Field Visit with GPS

Access Description: Access is possible via boat from a landing at the north end of the lake on the Chester Shannon mine access road from Highway 144.

Exploration History

1933: The occurrence was found by the Chester Shannon Group - Young Shannon GML. Reported gold values ranged between 15 and 19 g/t gold ($8.80 to 0.56opt) in a quartz vein. 1934: Young Shannon GML started shaft sinking on the adjacent Shannon Island. During this period the vein on Our Island (Young Island) was resampled and reported values ranged between 7.8 and 22 g/t gold (0.23, to 0.64opt). 1965: Chester Minerals Ltd acquired the property and carried out a program of geological mapping, magnetic and HLEM electromagnetic surveying. Based on this work 5 holes were drilled to test targets east of Our Island. 1973: Park Precious Metals optioned the property but no work was directed towards the gold occurrence on Our Island. Results of a nearby diamond drill hole cored at this time were reported as 'of no economic value'. 1980: Hargor Resources together with Canadian Gold and Metal Inc carried out a regional airborne magnetic and VLF electromagnetic survey which covered the area. 1984: Chester Minerals carried out a geological evaluation of the occurrence in combination with other known occurrences on Clam Lake and resampled the mineralization with the following result 0.29 g/t Au 46ppm Cu. Chester Minerals Limited – EM, Mag. 1987: Young Shannon Gold Partnership carried out a 7 holes diamond drill program to test the mineralization in the area. No holes intersected the known vein. 2010: Robert, P. – EM, Mag. Trelawney Mining and Exploration Inc. – AEM, AMag.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Swayze

Geological Age: Neoarchean   Geochronological Age: 2740 MA   Geochron. Age Ref.: GSC OF 3384A

Geology Comments

Dec 07, 2005 (S Fumerton) - The mineralization is located in a narrow shear zone that transects the host granodiorite. This shear is up to 2m thick. There are abundant fractures near to the main shear zone. These are both subparallel with, and discordant to the shear zone. The vein on the mainland strikes 236 deg.

Lithology

Lithology Comments

Dec 07, 2005 (S Fumerton) - Medium grained granodiorite with an off white to pink weathered surface and a pale green fresh surface. Quartz forms 20 - 30% of the rock and fine grained amphibole forms 10 - 15%. Local sericitic alteration occurs in the shear zone. Just north of the shear zone that has been pitted, and mostly under water, there is a banded and locally brecciated intensely silicified and carbonated material. This alteration may be centred on a shear. On the mainland near Our Island is a shear zone with strong chlorite alteration and a pinkish tint to the quartz diorite. This alteration emphasises the original blue quartz grains.

Mineralization

Mineralization Comments

Dec 07, 2005 (S Fumerton) - Medium grained semi massive pyrite veins occur in a silicified shear zone. The individual veins are attenuated and range between 3 and 5cm. The shear zone is also cut by a network of thin quartz stringers (<<10cm) containing sparse disseminated pyrite in very fine grained milky quartz. One quartz pod measuring 0.3 x 2m also occurs in the shear zone. Sulphides are concentrated in the western part of the exposed shear zone. On the mainland the extensive trenching is centred on a quartz - carbonate - sulphide - specularite vein. Pyrite and specularite each make up about 20% of the vein and pyrite also occurs along fractures in the vein.

Dec 07, 2005 (A Wilson) - At the time of discovery reported gold values from grab samples averaged between 15-19 g/t Au. The vein was resampled in 1934 and returned values of between 7.8 and 22 g/t Au. Diamond drilling has returned poor gold values. Grab samples collected by the OGS in 1980 returned values of 3.8 g/t Au. Grab samples collected by the OGS in 1993 returned values of: 1.05 g/t Au, 0.3 g/t Ag; 3.6 g/t Au, 0.7 g/t Ag; 1.22 g/t Au, 1.6 g/t Ag; 2.35 g/t Au, 1.1 g/t Ag; 0.0g g/t Au, 0.1 g/t Ag.

Assay Samples

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

Site Visit Information

Date: Jul 28, 1954

Geologist: W Savage

Notes: On the west side of the island there is a 'blowout' of quartz and sulphides in a weakly sheared breccia. The shearing strikes N75E and dips 60N. Sulphides observed were pyrite and pyrrhotite. [ PRECIS ]

References

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

Publication Number: GSC OF 1087 Page: 41P-64  Date: 1985

Author: Rose, D. G.

Publisher Name: Geological Survey of Canada

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

File - Resident Geologist files T-6349

Publication Number: Date:

Author:

Publisher Name:

Location: Timmins RGP office

Map - Three Duck Lakes area, District of Sudbury, Ontario

Publication Number: ARM41D Scale: 1:47,520    Date: 1997

Author: Laird H.C.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geological series, Precambrian geology of Chester and Yeo townships, and parts of Neville and Potier townships, Jerome area, Sudbury District

Publication Number: P2449 Scale: 1:15,840    Date: 1981

Author: Siragusa G.M.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology, Parts of Chester, Neville, Potier and Yeo Townships

Publication Number: OFM0214 Scale: 1:15,840    Date: 1993

Author: Siragusa G.M.

Publisher Name: Ontario Geological Survey

Location:

Map - Geology, Swayze greenstone belt, Gogama, Ontario

Publication Number: OF3384G Scale: 1:50,000    Date: 1999

Author: Heather, K B; Shore, G T

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/210455

MonoMap - Geology, Geochemistry and Mineralization of the Southern Margin of the Swayze Belt

Publication Number: OFR5844 Page: 88  Date: 1993

Author: Siragusa G.M.

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: 409-411  Date: 1995

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

Publisher Name: Ontario Geological Survey

Location:

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