Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41P12SW00132

Record: MDI41P12SW00132

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Chester

Latitude: 47° 33' 59.31"    Longitude: -81° 53' 8.94"

UTM Zone: 17    Easting: 433370.59   Northing: 5268497.71    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 41P12SW

Point Location Description: Trenches

Location Method: Field Visit with GPS

Access Description: Easy access is possible to the prospect as it is located adjacent to the Chester Shannon mine access road. This access road connects to Highway 144 via the Mesomikena Lake road.

Exploration History

1965: Manderson, M.E., Hedley, F., Ruscoe, E.B., and McCurdy, G.W. – Mag. 1969: Renmark Explorations Limited – EM. 1977 - 1978: Texasgulf Canada Limited – EM, Mag. 1981: Murgold Resources - VLF-EM survey, stripping. 466738 Ontario Ltd. – Str, DD – 1 – 210m. 1989: Gold Bar Resources Inc. – Mag. 2010: 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 3384G

Geology Comments

Oct 25, 2013 (A Wilson) - Both shear zones and veining present are sinuous with a shallow northerly dip. The zones, which are locally up to 2m thick, are about 10 m apart and contain boudinaged felsite dikes. On a smaller scale, there are two shear directions forming a diamond pattern. The older and weaker direction strikes 105, whereas the later cross cutting shears strike 130/40N.

Lithology

Lithology Comments

Oct 25, 2013 (A Wilson) - The mineralization is associated with a shear zone that appears to be located on the northern contact of a granodiorite lens which has intruded and narrows eastward into various fine and coarse grained dioritic phases. Two types of diorite are present, a fine-grained massive variety and the more typical Chester Granitoid Complex coarser variety. Within the coarser grained diorite, there are phases that have feldspar porphyries and a flasered texture. Locally, the dioritic phases have rounded agmatitic clasts. Widespread, though weak, epidote alteration tends to be restricted to the dioritic material. Within the granodiorite lens away from the shearing, there are a number of small quartz veinlets within a rhombohedral joint pattern. Individual veins are up to 3 x 100 cm. Where the granodiorite phases are cut by shearing, some sericite alteration occurs together with localized zones of intense silicification and epidote veinlets. However, the more common alteration is strong carbonate and weaker chlorite alteration which is unevenly developed along strike.

Mineralization

Mineralization Comments

Oct 25, 2013 (A Wilson) - Within the shear zone there are a series of short thin semi-massive sulphide veinlets. These tend to be more abundant in the siliceous or granodioritic phases within the showing. In addition to these veinlets, there are fine pyrite grains and lesser chalcopyrite grains disseminated through the main shear zone over width up to a metre and along lengths of 5 to 10m. North of the main shear zone, in another shear, there are a number of large parallel, en echelon quartz veins. These large veins contain localized aggregates of very coarse iron carbonate crystals. Murgold obtained assays up to 13 g/t from the vein. Grab samples collected by the OGS in 1993 returned the following values: 122.7 g/t Au, 16.5 g/t Ag; 0.21 g/t Au, 0.1 g/t Ag; 0.18 g/t Au, 0.1 g/t Ag; 0.02 g/t Au, 0.1 g/t Ag.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Shear

References

File - Resident Geologist files T-6348

Publication Number: Date:

Author:

Publisher Name:

Location: Timmins RGP office

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:

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

Publication Number: OFR5844 Page: 105-106  Date: 1993

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:

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: 455-456  Date: 1995

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

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

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