Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000002482

Record: MDI000000002482

General

Commodities

Primary Commodities: Copper, Zinc

Secondary Commodities: Lead, Silver, Gold

Location

Township or Area: Elmhirst

Latitude: 49° 46' 18.46"    Longitude: -87° 38' 13.78"

UTM Zone: 16    Easting: 454121   Northing: 5513453    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 42E13SE

Point Location Description: Map in Assessment report 20000006225

Location Method: Based on Assessment

Exploration History

1971: Properties covering the occurrence were staked by Arthur J. Douglas. A number of pits and trenches were dug before the claims were optioned to Cerro Mining Company of Canada Ltd. 1971-73: Cerro conducted geological, ground EM and mag surveys, and dug six trenches. The claims were later cancelled. 1976-1981: Properties staked and restaked a number of times. 1983: Mag and EM surveys conducted by John S. Grant. 1984: Geological and geochemical surveys were conducted by the Elmhirst Lake Syndicate. 2009: Alto Ventures Ltd. carried out prospecting and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Terrane: Eastern Wabigoon

Belt: Onaman-Tashota

Geological Age: Archean  

Lithology

Lithology Comments

Dec 18, 2020 (Therese Pettigrew) - Most of the claims are underlain by felsic to intermediate coarse pyroclastic rocks such as tuff breccia, lapilli tuff, and crystal tuff. The metavolcanics strike at about N70E and dip quite steeply to the south. Patches of gossan covering the felsic metavolcanics are common, and in some places pyrite forms as much as 10% of the rock (Mason and White, 1986).

Mineralization

Mineralization Comments

Dec 18, 2020 (Therese Pettigrew) - From the Cerro Pit 3 area, Sample 755215 collected by Alto Ventures in 2009 returned 15,018 ppm Cu (1.502% Cu) and 2450 ppm Zn from a chlorite schist with quartz veining, 7-10% chalcopyrite, 1-2% pyrite, and moderate malachite staining. Sample 755216 returned 0.109 ppm Au, 10,391 ppm Cu, 13,176 ppm Pb, and 21,144 ppm Zn from quartz veining in a chlorite schist with 3-5% disseminated chalcopyrite, 2-3% disseminated pyrite, and 0.1-0.5% finely disseminated galena (Assessment report 20000006225).

Mineral Record Details

References

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

Publication Number: M2102 Scale:     Date: 1997

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

Publisher Name: Ontario Dept. of Mines

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

Publication Number: R168 Scale:     Date: 1978

Author: Mackasey W.O., Wallace H.

Publisher Name: Ontario Geological Survey

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

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

Publication Number: OFR5630 Scale:     Date: 1986

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

Publisher Name: Ontario Geological Survey

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

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Ministry Contact Information

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