Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E13NE00015

Record: MDI42E13NE00015

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Zinc, Lead

Location

Township or Area: Elmhirst

Latitude: 49° 45' 48.77"    Longitude: -87° 41' 9.54"

UTM Zone: 16    Easting: 450597   Northing: 5512567    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E13NE

Point Location Description: DDH MUD07-06 from Assessment report 20000003447

Location Method: Data Compilation

Access Description: The claim is located in south central Elmhirst Township, approximately 1.6 km southeast of East Coyle Lake. Travel north on secondary highway 801 from Nezah (10.1 km west of Jellicoe) for 12.9 km, then northeast on a lumber road for about 8 km. The claim group is located approximately 1.6 km southwest of the road.

Exploration History

1924: The property covering the occurrence was staked by C.W. Taylor and subsequently transferred to Oliver-Severn Gold Mines Limited. At this time, Oliver-Severn held a block of six claims. 1935: A number of trenches were dug and some diamond drilling was done by Oliver-Severn Gold Mines Limited. 1940: The claim was transferred (along with the other five claims in the block) to W.E. Segsworth, who applied for a 10 year lease in the same year. The lease was approved and subsequently transferred to Oliver-Severn Gold Mines Limited. 1950: The lease was renewed for an additional 10 year period. 1960: The lease was renewed for an additional 10 year period. 1972: The lease was renewed for 10 years, from October 1, 1970. 1976: Oliver-Severn's Ontario Charter was cancelled. 1977: The lease was declared forfeit. 1989-90: Noranda Exploration Company Ltd. carried out sampling and IP/resistivity surveys. 1991: J. Parres and J. Tomac conducted a VLF-EM survey. 1995: J. Parres and J. Tomac carried out sampling. 1996-97: Edda Resources Inc. carried out stripping and sampling. 2005: Alto Ventures Ltd. conducted IP surveys, mapping, and sampling. 2007: Alto Ventures drilled 6 DDH totalling 354 m. 2008: Alto Ventures drilled 1 DDH totaling 50 m.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Terrane: Eastern Wabigoon

Belt: Onaman-Tashota

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - All the consolidated rock on the claims is granite except a small lenticular remnant of older rocks in which the veins occur. Apparently the roof of the batholith was not far above the present surface. Dark-colored and gneissic areas in the granite at several other places in the vicinity are probably the lower parts of other roof pendants now almost completely assimilated. The main lava inclusion of the Oliver-Severn claims is now chlorite schist. It is 225 feet in length and 35 feet in width at the widest part. The strike is N65 degrees E. In the schist there are large and irregular quartz veins roughly parallel to the schistosity. Individual quartz veins in the wide part of the lens have width up to 5 feet, and at the point where the schist inclusion has a total width of 30 feet, approximately one-half of it is quartz. At the southwest end where the schist tapers out, a quartz vein continues into the granite beyond the end of the schist, but narrows sharply and fingers out. The quartz is a white, vitreous variety. Metallic minerals form 5 to 10% of the vein material. Py and cp are in approximately equal proportions, and in places quiet large masses of mixed sulphides occur in the quartz. The chlorite schist in which the quartz veins occur contains only small quantities of sulphides.

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - All the consolidated rock on the claims is granite except a small lenticular remnant of older rocks in which the veins occur. Apparently the roof of the batholith was not far above the present surface. Dark-colored and gneissic areas in the granite at several other places in the vicinity are probably the lower parts of other roof pendants now almost completely assimilated.

Dec 18, 2020 (Therese Pettigrew) - The host chlorite schist is derived from pillowed mafic volcanic flows which are vesicular and although well foliated, remnant pillow selvedges and vesicles are evident in the wallrocks. The overall trend of mineralization is east west at approximately 084 degrees azimuth with a pronounced south dip of 65-80 degrees, schistosity is very pronounced locally and undulates and flexes around lithons of quartz veins, and granodiorite dykelets. Quartz veining is of a white patchy, blowout variety occurring predominantly as "lithons" at contacts between granodiorite and chlorite schist and occasionally as stockworks in the granodiorite and en-echelon vein continuations in the chlorite schist. White to grey opaque stringer quartz and crack-seal textures are also observed locally. Remnant inclusions of mafic volcanic/chlorite schist with ragged edges were observed locally within the granodiorite intrusive and show characteristics of resorption (Assessment report 42E13SE0162).

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - The chlorite schist in which the quartz veins occur contains only small quantities of sulphides. Thomson (1935) reports the examination of two specimens, one of which consisted mainly of sulphides, the other mainly of gangue. In the former, pyrite and galena were the predominant metallic minerals, with subordinate quantities of sphalerite, chalcopyrite, hematite and gold; the latter specimen showed chalcopyrite as the common metallic mineral, with pyrite and hematite in minor amounts. Bruce (1936) states that the sampling of trenches inidicated an average gold content of 0.17 oz/ton Au over a width of 4 feet 8 inches for a length of 200 feet.

Dec 18, 2020 (Therese Pettigrew) - The Oliver-Severn No. 1 occurrence is a 2-10 m wide zone striking 080 which hosts several steeply dipping quartz veins in a zone of strong shearing. This zone has an observed strike length of 65 m before disappearing into a swamp to the west (it is cut by a 020 azimuth shear zone to the east) (Assessment report 42E13SE0110). The Oliver-Severn No. 1 zone occurrence is contained in a chloritic fault/shear zone trending nominally 083 degrees azimuth, with steeply dipping discontinuous quartz veining and quartz-pyrite boudins occurring locally in the central portions of the zone. The No. 1 zone appears to be related to or contained within an arcuate northeast trending fault structure transecting the Coyle Lake intrusion. Sulphide mineralization was observed as disseminations, stringers and massive accumulations of pyrite, large dissemination blebs and stringers of chalcopyrite and rosettes of specular hematite noted sporadically. Sampling done in 1990 returned up to 33.08 g/t Au. In 1996-97, high values of 1.7 oz Au/t, 1.1 oz Au/t, 0.72 oz Au/t, 0.253 oz Au/t and 0.202 oz Au/t were derived largely from elevated concentrations (3-10%, locally massive) of blebby and disseminated pyrite in quartz-carbonate vein material (Assessment report 42E13SE0162). DDH MUD07-06 returned 3.59 g/t Au over 6.1 m including 14.89 g/t Au over 1 m. DDH MUD08-22 returned 8.12 g/t Au over 1 m DDH MUD08-23 returned 3.5 g/t Au over 0.9 m. DDH MUD08-40 intersected a 2.5 m wide zone of quartz veining in sheared diorite. This hold is 100 m SW along strike from the Oliver-Severn Showing and returned anomalous gold of 0.19 Au over 1 m in the vein and also in the sheared host rock (0.182 g/t Au across 1 m) (Assessment report 20000004542). Samples taken in 1995 returned assays from 0.013 oz/t Au up to 1.831 oz/t Au (0.44-62.77 g/t Au) (Assessment report 42E13SE0075).

Mineral Record Details

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:

MonoMap - Geology of Elmhirst and Rickaby townships, District of Thunder Bay

Publication Number: R168 Date: 1978

Author: Mackasey W.O., Wallace H.

Publisher Name: Ontario Geological Survey

Location:

Map - Elmhirst and Rickaby townships, Thunder Bay District

Publication Number: M2373 Scale: 1:31,680    Date: 1977

Author: Mackasey W.O., Wallace H.

Publisher Name: Ontario Geological Survey

Location:

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

Publication Number: OFR5630 Page: 454-456  Date: 1986

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

Publisher Name: Ontario Geological Survey

Location:

Part - The eastern part of the Sturgeon River area (Jellicoe-Sturgeon R. section)

Publication Number: ARV45-02.001 Page: 56-57  Date: 1998

Author: Bruce E.L.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Thunder Bay data series, Wilkinson Lake area, District of Thunder Bay

Publication Number: P2514 Scale: 1:15,840    Date: 1982

Author: Speed A.A.

Publisher Name: Ontario Geological Survey

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

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