Ontario Geological Survey
Permanent Link to this Record:
MDI42E05SW00029
| Record Name(s) | Claus Lake - 1970 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1997-Feb-26 |
| Date Last Modified | 2022-May-06 |
| Created By | |
| Revised By |
Primary Commodities: Silver
Township or Area: Barbara Lake Area
Latitude: 49° 18' 47.41" Longitude: -87° 59' 36.01"
UTM Zone: 16 Easting: 427802.04 Northing: 5462744.92 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42E05SW
Point Location Description: Trenches and pits. Location from description in OFR5951.
Location Method: Other Literature
Access Description: The Claus Lake occurrence is located 40 km northeast of Nipigon in the Georgia Lake area. The occurrence is approximately 1 km west of Claus Lake. Access is via 4x4 vehicle on the Gorge Creek Road from Highway 11, just north of Keemle Lake. The road extends to Claus Lake, where a bridge is washed out.
A small amount of trenching and pitting was conducted. The time-frame, however, is unknown. No assessment records were found on file.
Province: Superior
Subprovince: Quetico
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The area is underlain by Archean and Proterozoic aged rocks. The Archean rocks include Quetico metasedimentary rocks. The metasedimentary rocks are intruded by granitic rocks, porphyry, pegmatite and aplite. The Proterozoic rocks are represented by the Sibley Group sedimentary rocks. Intrusive into the Proterozoic sedimentary rocks and the older formations are bodies of diabase. The Claus Lake occurrence consists of a narrow (10 to 15 cm wide) iron formation within metasedimentary rocks. The iron formation strikes east-west and has a vertical dip, and is exposed for approximately 10 m.
| Rock Type | Rank | Composition | Texture | Relationship | Sandstone | 1 | Unspecified Quetico Metased. | Near |
|---|---|---|---|---|
| Diabase | 2 | Diabase | Near | |
| Ironstone-unsubdivided | 3 | Ch-Amp-Gt | Host |
Dec 07, 2005 (B Nelson) - The iron formation consists of alternating chert and amphibole-garnet rich layers which are slightly magnetic (oxide facies?).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 1 | Amphibole | Economic | Gangue | ||||
| 2 | Garnet | Economic | Gangue |
Dec 07, 2005 (B Nelson) - Up to 2% pyrite was observed in the iron formation. One grab sample (90-BCL-1) of the oxide facies iron formation collected by the Resident Geologist's staff assayed 0.005 oz/ton Au, 1.97 oz/ton Ag, 0.004% Cu and 0.003% Zn.
Sep 13, 2019 (Therese Pettigrew) - The Claus Lake occurrence consists of a narrow (10-15 cm wide) iron formation within metasedimentary rocks. The iron formation strikes E-W and has a vertical dip, and is exposed for approximately 10 m. The iron formation consists of alternating chert and amphibole-garnet-rich layers which are slightly magnetic. Up to 2% pyrite was observed in the rock (Schnieders et al., 1996).
Dec 07, 2005 (B Nelson) - Unknown.
Date: Feb 26, 1997
Geologist: B Nelson
Notes: Resident Geologist personnel visited the occurrence June 29, 1990.
Map - Georgia Lake area, Thunder Bay District
Publication Number: M2056 Scale: 1:63,360 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 892-893 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
MonoMap - Geology and lithium deposits of Georgia Lake area, District of Thunder Bay
Publication Number: R031 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
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