Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E10NW00028

Record: MDI42E10NW00028

General

Commodities

Primary Commodities: Gold, Copper

Secondary Commodities: Zinc

Location

Township or Area: Ashmore

Latitude: 49° 43' 43.13"    Longitude: -86° 53' 52.85"

UTM Zone: 16    Easting: 507350   Northing: 5508466    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E10NE

Point Location Description: Trenches, stripped areas, diamond drill sites from Assessment file 42E10NW0010

Location Method: Data Compilation

Access Description: The claim group lies approximately 2 km east-northeast of Geraldton and 1 km south of the unnamed lake SW of Ashmore Lake. A bulldozer road is developed into the property from the old cemetery road northeast of Geraldton..

Exploration History

1947: Little Long Lac Gold Mines carried out geological mapping, magnetic surveys, and drilled 18 DDH totalling 2750.8 m. 1982: Two claims (TB632189 and TB632190) were staked by Mel Swereda on June 5, 1982. George Moore staked two adjacent claims (TB632182 and TB632183) to the east on May 20, 1982. The four claims were worked as one property by both men. 1983-84: Trenching was done over two mineralized shear zones which comprise the occurrence and extensive surface stripping was completed. Several shallow 18 m drill holes (AQ size) were also put down in the vicinity of the mineralized zones. 1990: M Swereda carried out trenching, sampling, and drilled 2 DDH totalling 84.1 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Beardmore-Geraldton

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The property is located within mafic to intermediate metavolcanic rocks proximal to a contact with clastic metasedimentary units to the south. The claim block is part of a highly sheared zone which is cut by numerous east-trending diorite-gabbro intrusive 'lenses.' Two parallel graphitic shear zones, 120 m apart and striking north 120 degrees east and dipping 80 degrees southeast, are exposed on the claims. The zones range up to 50 cm in width and are discontinuous, with a prominent fissile nature. The enclosing volcanic rocks are highly strained in the immediate vicinity of the shears, containing numerous cross-cutting, irregular quartz-carbonate veins and stringers. Drag-folding is exhibited by some stringers. Shear zone #1, to the north, consists of a central graphite-rich band containing quilts, patches and colliform-like pyrite, and two narrow parallel cherty iron formation horizons. The No. 2 zone is highly mineralized and contains up to 25% sulphides, which are massive in places. Siderite-ankerite and graphite occur as margins along quartz-carbonate vein boundaries.

Lithology

Mineralization

Mineralization Comments

Jul 25, 2019 (B Nelson) - Mineralization is massive in places within the graphitic shears, containing up to 25% sulphides. The No. 2 zone is highly mineralized and contains up to 25% sulphides, which are massive in places. It consists mainly of dull grey quartz and pyrite with lesser amounts of chalcopyrite, pyrrhotite and minor (4%) disseminated sphalerite. Siderite-ankerite and graphite occur as selvages along quartz-carbonate vein boundaries. Pyrite was also noted in the surrounding volcanic rocks, existing as blebs, euhedral crystals and fine disseminations. Prominent limonite-staining is present where sulphides occur. Volcanic rocks in the vicinity of these altered zones are predominantly carbonate-rich. A total of 20 grab samples from both shear zones was collected during three property visits by the Beardmore-Geraldton Economic Geologist. All samples returned only trace amounts of gold (i.e. <0.01 oz/t Au) (Thunder Bay RGP Mineral Deposit file).

Jul 25, 2019 (Therese Pettigrew) - Sample 90-MM3 returned an assay of 1260 ppm Zn and 303 ppm Cu. Sample 90-MMS-7 returned an assay of 0.134 oz/t Au (4.17 g/t Au). Sample 90-MMS-8 returned an assay of 0.141 oz/t Au (4.4 g/t Au). Sample 90-MMS-13 returned 0.932 ppm Au. Sample 91-MMS-8 returned 0.008 oz/t Au (0.25 g/t Au), 3236 ppm Cu, and 2800 ppm Zn (Assessment report 42E10NW00100).

Alteration Comments

Dec 07, 2005 (B Nelson) - Siderite-ankerite and graphite occur as margins along quartz-carbonate vein boundaries. Prominent limonite staining is present where sulphides occur. Volcanic rocks in the vicinity of these altered zones are dominantly carbonate-rich.

Mineral Record Details

Site Visit Information

Date: Jan 20, 1997

Geologist: B Nelson

Notes: The Beardmore-Geraldton Economic Geologist visited the occurrence February 23, 1983, June 29, 1983 and September 19, 1984.

References

Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts

Publication Number: M2102 Date: 1997

Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane

Publication Number: OFR5630 Page: 551-552  Date: 1986

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology of Ashmore Township

Publication Number: ARV60-05 Date: 1997

Author: Horwood H.C., Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Township of Ashmore, District of Thunder Bay, Ontario

Publication Number: M1951-02 Scale: 1:12,000    Date: 1997

Author: Horwood H.C., Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

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Ministry Contact Information

For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office