Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI41J14NW00005

Record: MDI41J14NW00005

General

Commodities

Primary Commodities: Rare Earth Elements, Niobium

Secondary Commodities: Iron

Location

Township or Area: Maeck

Latitude: 46° 59' 36.64"    Longitude: -83° 18' 38.03"

UTM Zone: 17    Easting: 324320   Northing: 5207034    UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 41J14NW

Point Location Description: Site 3 from Assessment report 20000020759

Location Method: Data Compilation

Access Description: 100 metres from the south shore of Seabrook Lake, 2 .05 kilometres east of the west boundary of Maeck Township, 2 kilometres north of the south township boundary.

Exploration History

1955: W. Bussineau drilled 4 DDH totalling 173 m. 1957: F.R. Joubin carried out a geochemical soil survey and trenching. 1971: Canpac Minerals and Gunnex Ltd. cut a grid and carried out geological, geochemical, magnetometer and scintillometer surveys. 2012: TNR Gold Corp. carried out a soil sampling program. 2021: Transition Metals carried out prospecting and sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Geological Age: Early Precambrian  

Geology Comments

Dec 07, 2005 (P Beach) - Hematite in a mafic breccia within an alkalic complex.

May 25, 2023 (Therese Pettigrew) - The Seabrook Lake Carbonatite Complex has a K-Ar isotopic ages from biotite of 1109 and 1107 Ma and consists predominantly of carbonatite and ijolite. The carbonatite rocks are found in the northern portion of the complex, are highly variable in mineral content and texture, and are locally rich in hematite. Carbonate and biotite are the dominant minerals but pyroxene may locally be present in major quantities. South from the carbonatite rocks is an elongated body of ijolite, composed principally of nepheline and pyroxene. This rock unit is highly variable in composition changing from pyroxenite with <10% nepheline to pegmatitic segregations of urtite with >70% nepheline. The unit is massive, medium to coarse grained, equigranular, varying from black to dark green in the pyroxene-rich phases to pale pink in the urtite phases. In thin section most samples that were originally mapped in the field as pyroxenite contain sufficient nepheline to be classed asijolite with 30 to 70% nepheline.One sample contains sufficient potassium feldspar to be classed as malignite. Enveloping the carbonatite and ijolite rocksis a zone of fenitized granite breccia consisting of pink to red-brown clasts of altered granitic rock in a fine-grained dark matrix of altered and comminuted rock. Outward from the altered breccia is an up to 300 m zone of fenitized granite. Farther away from the complex the granite becomes increasingly less altered and fenitized. The granitic rocks, but notthe carbonatite complex, are cut by a set of northwest-striking diabase dikes. Small dikes of carbonate-rich rock and lamprophyre cutthe granitic rocksin several places (Sage, 1988).

Lithology

Lithology Comments

May 25, 2023 (Therese Pettigrew) - Site 3 samples are described as locally brecciated hematitic sovite (Assessment file 20000020759).

Mineralization

Mineralization Comments

May 25, 2023 (Therese Pettigrew) - Samples collected by TNR Gold in 2012 returned 4796.62 ppm TREO+Y and 1330 ppm Nb. Samples collected by Transitional Metals in 2021 returned up to 7127.17 ppm TREO+Y and 448 ppm Nb (Assessment report 20000020759).

Mineral Record Details

References

Map - Seabrook Lake area, District of Algoma

Publication Number: M2005 Scale: 1:15,840    Date: 1997

Author: Parsons G.E.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Geology of carbonatite-alkalic rock complexes in Ontario: Seabrook Lake carbonatite complex, District of Algoma

Publication Number: S031 Date: 1988

Author: Sage R.P.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Niobium-bearing complexes east of Lake Superior

Publication Number: R003 Page: 20  Date: 1997

Author: Parsons G.E.

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 Page: 123  Date: 1985

Author: Rose, D.G.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/129999

Book - CAN. JOURNAL OF EARTH SCIENCES VOL 4 P 652-653

Publication Number: CJES Vol 4 Date: 1967

Author: Gittins, J., MacIntyre, R.M., York, D.

Publisher Name:

Location:

Thesis - Mineralogy, Geochemistry, and Petrology of a Pyrochlore-bearing Carbonatite at Seabrook Lake, Ontario, Canada

Publication Number: PhD Thesis Date: 1967

Author: Osatenko, M.J.

Publisher Name: University of British Columbia

Location: SSM RGP

Thesis - Petrogenesis of the Seabrook Lake Carbonatite Alkaline Complex, Northwestern Ontario

Publication Number: MSc Thesis Date: 1984

Author: Parbery, D.

Publisher Name: University of Western Ontario

Location: SSM RGP office

Book - CANADIAN JOURNAL OF EARTH SCIENCES VOL 29, NO. 6 P 1215-1223

Publication Number: CJES V 29 Date: 1992

Author: Symons, D.T.A.

Publisher Name:

Location:

Mono - Iron deposits of Ontario

Publication Number: MDC011 Page: 41  Date: 1968

Author: Shklanka R.

Publisher Name: Ontario Dept. of Mines

Location:

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For detailed information regarding this mineral record please contact the Sault Ste. Marie Resident Geologist District Office