Ontario Geological Survey
Permanent Link to this Record:
MDI42C02NE00128
| Record Name(s) | Sheldon Lake Iron Range - 1950 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-08 |
| Date Last Modified | 2022-Sep-06 |
| Created By | |
| Revised By |
Primary Commodities: Iron
Township or Area: Corbiere
Latitude: 48° 9' 27.15" Longitude: -84° 34' 55.68"
UTM Zone: 16 Easting: 679806.35 Northing: 5336637.74 UTM Datum: NAD83
Resident Geologist District: Sault Ste. Marie
NTS Grid: 42C02NE
Point Location Description: Occurrence 4 map P.2607
Location Method: Conversion from MDI
Access Description: The east end of the iron range lies along the north shore of Sheldon Lake. It can be easily accessed by air from Wawa or by a 5 km traverse north northeast from the end of the bush road heading north out of the community of Hawk Junction. The iron range stretches from the north shore of Sheldon Lake until it merges with the Big Lake Iron Range near Twin Lake.
1950: discovery by Jalore Mining Company Limited, geological mapping. 1953: optioned by Candela Development Company Limited, self potential survey. 1954: 6 ddh (1756 ft).
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| Corbiere-0012 | 42C02NE0019 | 42C02NE0019 |
| CORBIERE 0027 | ||
| CORBIERE 0014 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Michipicoten
Tectonic Assemblage: Wawa
Geological Age: Neoarchean Geochronological Age: 2750 MA Geochron. Age Ref.: OFR 5888
Dec 07, 2005 (A Wilson) - The Sheldon Lake Iron Range lie between intermediate to mafic metavolcanic rocks to the north and a metasedimentary unit to the south. Along the south shore of Sheldon Lake there is a thin unit of intermdeicate to mafic pillowed metavolcanic rocks. South of the mafic metavolcanic rocks lies an area of schistose intermediate to felsic metavolcanic rocks that is composed of feldspar crystal tuff. The Sheldon Lake Iron range wraps partly around the nose of the Alden Lake Anticline and is separated from the East Brooks Iron Range to the south by a synclinal fold axis.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Chert-Siderite | Breccia | Host |
|---|---|---|---|---|
| Siltstone | 2 | Wacke | Hanging Wall | |
| Intermediate Crystal Tuff | 3 | Schistose, Crystal Tuff | Footwall |
Dec 07, 2005 (A Wilson) - The iron formation is dominately chert breccia cemented with iron oxide. It has been described as a fine-grained breccia with granular silica. Siderite is mixed with the silica and locally the iron formation is well banded. Sulphide facies iron formation has been observed in drill core taken from the north side of the iron range. Stratigraphically, the iron range appears to face south. The stratigraphic relations of the Sheldon Lake iron formation are thought to be modified due to strike-slip faulting prior to folding, giving rise to the highly schistose series of rocks. On the north side the intermediate to felsic metavolcanics are schistose, strongly carbonated and locally contain chloritoid porphyroblasts. Along the south side the iron formation lies in contact with a thin band of silstone-wacke that displays a prominent cross-cutting fracture cleavage. The intermediate to felsic metavolcanics that outcrop to the south of Sheldon Lake are schistose and moderately to highly carbonated.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Siderite | Economic | Ore | ||||
| 1 | Pyrite | Economic | Gangue | ||||
| 2 | Pyrrhotite | Economic | Gangue | ||||
| Ankerite | Alteration | Carbonatization | 1 | Medium | Replacement | ||
| Chloritoid | Alteration | Chloritic | 2 | Medium | Replacement |
Dec 07, 2005 (A Wilson) - Pyrite and pyrrhotite content increase on the north side of the iron formation.
| Rank | Classification |
|---|---|
| 1 | Sedimentary |
| Rank | Characteristic |
|---|---|
| 1 | Concordant |
| 2 | Stratiform |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Regular | 2440 | 50 | 90 | 85 | 2750 MA | OFR 5888 |
Map - Michipicoten area, compilation sheet, District of Algoma
Publication Number: P0184 Scale: 1:126,720 Date: 1997
Author: Goodwin A.M.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, Precambrian geology, Corbiere Township, Algoma District
Publication Number: P2607 Scale: 1:15,840 Date: 1984
Author: Sage R.P., Calvert T., Epstein R., England D., Koscinsko K., Worona R., Oudkerk G., Inasi J., Lockwood M.B., Thomas D.
Publisher Name: Ontario Geological Survey
Location:
Folio - Corbiere Township, District of Algoma
Publication Number: GDIF297 Date: 1997
Author: Sault Ste Marie RGO
Publisher Name: Ontario Geological Survey
Location:
Mono - Iron deposits of Ontario
Publication Number: MDC011 Page: 59 Date: 1968
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Wawa mineral deposits data base
Publication Number: OFR5775 Page: 153 Date: 1991
Author: Frey E.D., Stewart R.C.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of Abotossaway, Corbiere, Leclaire and Musquash Townships and Part of Dunphy Township, District of Algoma
Publication Number: OFR5587 Page: 280-281 Date: 1993
Author: Sage R.P.
Publisher Name: Ontario Geological Survey
Location:
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