Ontario Geological Survey
Permanent Link to this Record:
MDI42E03SW00012
| Record Name(s) | Big Birch Occurrence - 1991, H. Larson - 1991, Tb 2182 - 1991, Big Duck Lake Holdings - 1985 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Mar-31 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper, Silver
Township or Area: Rope Lake Area
Latitude: 49° 0' 11.62" Longitude: -87° 15' 5.64"
UTM Zone: 16 Easting: 481601 Northing: 5427845 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14NE, 42D14NW, 42E03SE, 42E03SW
Point Location Description: Two pits
Location Method: Field Visit
Access Description: The occurrence is located about 15 m south of the southeast shore of Big Duck Lake approximately 200 m west of a small creek draining out of the lake. It is approximately 750 m south of the Gray property (claim map G-606). Easiest access is gained by aircraft from Thunder Bay or Pays Plat to Big Duck Lake. Big Duck Lake is also accessed by a drill trail from the Winston Lake Mine site.
1912: Showing was staked by H. Larson. 1914-1916: Two hundred and fifty days of unspecified work (pitting ?); H. Larsen. This work resulted in the granting of a patent for the claim covering the occurrence. 1983: Property examination and lithogeochemical sampling; OGS Resident Geologist staff. 1985: The occurrence became part of Corporation Falconbridge Copper's Big Duck Lake holdings. An extensive program of geological, geophysical and geochemical surveys were conducted in the area followed by diamond drilling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.7632 | 42E03SE8252 | 42E03SE8252 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (D McKay) - Schnieders et al. (1996) describe the geology as follows: The geology consists of mafic metavolcanics, pillowed and fine-grained flows. The pillows and possible pillow breccia display epidote alteration. Two pits were observed, striking east-west and separated by 5 m. The main pit is approximately 2.5 m in length and 2 m wide, and exposes a narrow 10 cm wide quartz and calcite vein. The flat vein strikes 295 degrees and dips 40 degrees N and contains pyrite and possible chalcopyrite mineralization. A gossan rich zone up to 0.5 m wide was observed in the main pit.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz-Calcite | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Pillowed, Locally Brecciated (?) | Host |
Dec 07, 2005 (D McKay) - The geology consists of mafic metavolcanics, pillowed and fine-grained flows. The pillows and possible pillow breccia display epidote alteration.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Calcite | Economic | Gangue | ||||
| Quartz | Alteration | Hydrothermal | 1 | Unknown | Veins | ||
| Calcite | Alteration | Hydrothermal | 2 | Unknown | Veins | ||
| Epidote | Alteration | Epidotization | 3 | Unknown | Disseminated |
Dec 07, 2005 (D McKay) - Schnieders et al. (1996) describe the mineralization as follows: Quartz-calcite veinlets containing pyrite and some chalcopyrite occupy a series of fractures. Gold values are associated with these veinlets. Grab samples collected from the occurrence in 1983 by OGS Resident Geologist staff returned assay values of up to 0.02 opt Au, 0.10 opt Ag and 0.02% Cu.
Dec 07, 2005 (D McKay) - The pillows and possible pillow breccia display epidote alteration.
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Mineral deposits of the Big Duck Lake area, District of Thunder Bay
Publication Number: R027 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Big Duck Lake area, District of Thunder Bay
Publication Number: M2023 Scale: 1:15,840 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: 835-837 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
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