Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42A04NW00009

Record: MDI42A04NW00009

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Sewell

Latitude: 48° 12' 13.32"    Longitude: -81° 54' 54.9"

UTM Zone: 17    Easting: 431996.08   Northing: 5339345.83    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 42A04NW

Point Location Description: Centre of trench cutting across a large stripped outcrop.

Location Method: Field Visit with GPS

Access Description: Relatively easy access is possible by taking a rough secondary road 6km from Highway 101. This road branches off the highway just east of Eastman River passes a land fill near the highway and the passes close to the stripped outcrop.

Exploration History

1945-47: Mining Corporation of Canada carried out a geological mapping program followed by trenching and diamond drilling. This drilling intersected gold values up to 9.2 g/t Au in and adjacent to quartz veins in the sheared contact between syenite and sheared diorite. In the following year the area was covered with a magnetic survey. 1982: Noranda resumed exploration on the property with a magnetic survey combined with two VLF-EM surveys, a soil, and a humus geochemical survey over a two year period. This program was followed with a drill program of at least seven holes most of which are not on file. 1984: Storimin Exploration optioned the property and drilled sixteen holes for 1657m over a 200m strike length. This drilling intersected multiple zones with some values up to 90 g/t Au. 1991-93: Noranda Exploration carried a large magnetic survey which included the occurrence, trenching. 1995: Hemlo Gold Mines Inc. - 2 ddh (792.5 m). 2004: Richmont Mines Inc. – DD – 4 – 1034m, Assays. 2012: Prodigy Gold Inc. – AEM, AMag.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Swayze

Geological Age: Neoarchean  

Metamorphism Type: Regional

Metamorphism Grade: Greenschist

Geology Comments

Dec 07, 2005 (S Fumerton) - The main vein is located in a small shear zone / fault. Branching off this main structure are numerous splay faults at different orientations. These splays and the main structure are marked by a sharp increase in the foliation intensity and the local development of a schistosity close to the faults. Within the foliation / schistosity crenulation folds and lineations are developed. These minor faults control the shape of the late mafic dykes. 'Z' folds are present in the main quartz vein with long limbs on the ten metre scale and short limbs on the metre scale. In addition the vein undulates along strike and down dip.

Mar 15, 2016 (A Wilson) - The vein occurs within an east-northeast-trending deformation zone consisting of highly schistose and carbonatized diorite up to about 10 m wide. The deformation zone trends parallel to and may be a subsidiary structure to the Deerfoot Deformation Zone.

Lithology

Lithology Comments

Mar 15, 2016 (S Fumerton) - There is two phases of the host diorite, a hornblende mela-diorite and a hornblende leuco-diorite. These phases are in contact with each other but the age relationship is unknown. Both phases are very coarse grained (<4mm) with hornblende and plagioclase as the main minerals which are strongly saussuritized which has resulted in patches rich in epidote and calcite. Within one to three metres of faults which cut the diorite there is a strong foliation and local schistosity developed. Within this foliated phase small closely spaced calcite veinlets occur parallel to the vein. At the northeast end of the zone these schistose diorites contain mafic augen which have retrograded to chlorite and contain fine hornfelsic needles of a felsic mineral. Locally there are some irregular granitic veins which form a stockwork in the diorite. Mafic dykes, with highly irregular form, intrude the diorite and are up to 3m thick. The irregular form of these dykes is controlled by the fault pattern and the dykes themselves are fine grained and grey to green. Granitic dykes form parallel sheets close to and parallel with the main vein. These dykes are fine to medium grained, devoid of mafics and brick red. Diorite adjacent to these dykes is altered and the plagioclase grains have the same brick red colour. Presumably this granitic material was classified as syenite in earlier work.

Mineralization

Mineralization Comments

Dec 07, 2005 (S Fumerton) - Diamond drilling indicates there are at least two mineralized zones, however, only one major zone is exposed. The exposed zone is a quartz vein between 0.3 and 2m thick and 120m long with a few small satelite veins. The satelite veins are up to 5m from the main vein but only measure <3m long x <1m wide. The quartz veins are composed of coarse milky quartz and local calcite phases both of which are cut by numerous fractures parallel to the vein. These fractures are partially filled with massive and semi-massive fine to very coarse pyrite with minor chalcopyrite. The mineralization may be up to 1cm thick and extend in discontinuous trail along the fracture. These mineralized fractures are more abundant near the vein contacts. Possible secondary remobilisation has resulted in the sulphides extending short distances (<1cm) along orthogonal fractures. Locally the sulphides occur in spherical and elliptical concretions up to 20cm across. Where the sulphides are massive malachite occurs on the weathered surface and fractures.

Mar 15, 2016 (A Wilson) - Grab samples taken by the OGS returned assays of 175.3 g/t Au, 0.58 g/t Au, 7.16 g/t Au, 375.78 g/t Au, 11.24 g/t Au. Other reported assays from Mining Corporation Company drill core range up to 0.48 oz/t Au over 2.2 m and 0.28 oz/t Au over 2.3 m (T-162). The best assay returned from diamond drilling completed by Stormin was 0.976 oz/t Au over 2 ft (T-2552 / 63.4660).

Mar 15, 2016 (P Bousquet) - Storimin Exploration Limited drilled 16 holes, most of which intersected gold mineralization (T-2552 / 63.4660). Richmont Mines Inc. drilled the property in 2004. The best intersection returned an assay of 60.20 g/t over 1.3 m from diamond drill hole SE-04-02 (T-5389 / 2.32557). The mineralization was contained in a quartz vein with 5 to 9 % pyrite and visible free gold.

Assay Samples

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 2       Structure Type: Fault

Rank: 1       Structure Type: Shear

Site Visit Information

Date: Aug 23, 1947

Geologist: S Fumerton

Notes: Road from extreme north end of Akweskwa Lake, about 2 miles long - 35 minutes walk to showing. Only outcrop seen is one containing showing. It consists of fine grained green-red syenite or syenitized greenstone and coarse granite textured basic syenite approaching a gabbro in places. These rocks occupy irregular masses, and narrow dykelets of the f.g. syenite and red feldspathic syenite cut the coarse intrusive. Several rock pits have been excavated on a sheared zone containing quartz veins in the granite. The walls of the shear are soft, chloritic schist, derived from the coarse syenite and gabbro. The derivation is more obvious in the drill core than on the ground where it is weathered and schisted beyond recognition. The zone strikes N40E and is at least 50 feet wide, with a series of more or less parallel quartz veins and schist separated by sheared syenite. Most of the quartz is barren but one of the quartz veins in the main pit, about 2 feet wide, is well mineralized with pyrite and chalcopyrite. The pyrite occurs in granular form and the chalcopyrite as fine feathery seams near the pyrite. A little visible gold was also noted. Unfortunately, the strike is limited on both ends by covered ground, swamp to the north, and sand to the south. Diamond Drilling All the diamond drilling seems to have been confined to proving the surface showing and all the holes are drilled in similar type of rock. Hole 1-8 were drilled in the 1946 program of drilling, and holes A-G in 1947. Only a couple of holes were logged in detail and the others were scanned hastily. [ PRECIS ]

References

Map - Sewell Township, District of Sudbury

Publication Number: P0464 Scale: 1:15,840    Date: 1997

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines

Location:

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

Map - Reeves and Sewell townships, Sudbury District

Publication Number: M2230 Scale: 1:31,680    Date: 1972

Author: Milne V.G.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

MonoMap - Geology of the Kukatush-Sewell Lake area, District of Sudbury

Publication Number: R097 Page: 105-106  Date: 1972

Author: Milne V.G.

Publisher Name: Ontario Division of Mines

Location:

Map - Precambrian Geology, Northern Swayze Greenstone Belt

Publication Number: M2627 Scale: 1:50,000    Date: 1995

Author: Ayer J.A.

Publisher Name: Ontario Geological Survey

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: 118-119  Date: 1979

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

Publisher Name: Ontario Geological Survey

Location:

File - Resident Geologist files 1980, air photos

Publication Number: Date: 1996

Author:

Publisher Name:

Location:

MonoMap - Precambrian Geology, Northern Swayze Greenstone Belt

Publication Number: R297 Page: 49  Date: 1995

Author: Ayer J.A.

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: 497-499  Date: 1995

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

Publisher Name: Ontario Geological Survey

Location:

Book - Sewell Township - unpublished GDIF

Publication Number: GDIF Date: 1991

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