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Ontario Geological Survey
Permanent Link to this Record:
MDI42D14SW00035
| Record Name(s) | Rossport Veins - 1992 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1997-Feb-07 |
| Date Last Modified | 2022-Sep-02 |
| Created By | |
| Revised By |
Primary Commodities: Barite, Fluorite
Secondary Commodities: Sulphur/Pyrite
Township or Area: Lahontan
Latitude: 48° 50' 26.28" Longitude: -87° 28' 8.1"
UTM Zone: 16 Easting: 465593 Northing: 5409846 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14SW
Point Location Description: Roadside trenches
Location Method: Field Visit
Access Description: The barite-fluorite veins are located approximately 4 km east of the east Rossport turnoff and 2 km west of the Lakeshore Drive tunoff. The veins crosscut Hwy. 17. The veins outcrop in rock cuts located on the north side of Hwy 17, approximately 4 km east of Rossport, immediately south of the CPR. The veins can also be observed on the shoreline of lake superior.
Pre-1992: trenching; parties unknown. 1992: Geological mapping and lithogeochemical sampling; SH Resident/Staff Geologist (OGS). No assessment reports were found on file.
Province: Superior
Geological Age: Archean
Dec 07, 2005 (D McKay) - The occurrence comprises a number of veins and vein breccias that extend over an exposed width of almost 180 m. The veins range in thickness from <1 cm up to 60 cm and show a fairly consistent orientation between 125 and 160 degrees, parallel to, and sometimes hosted by, steeply dipping joints in pink to grey hornblende + biotite granite. A 1 m wide diabase dike at the western end of the rock cut has a similar orientation.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Q-Ba-Fl | Locally Brecciated And Zoned | Host |
|---|---|---|---|---|
| Granite | 2 | Host | ||
| Diabase | 3 | Diabase | Near |
Dec 07, 2005 (D McKay) - The granite which hosts the veins is typically pink to grey but is locally saussuritized and in places displays a green epidote colour.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Barite | Economic | Ore | ||||
| 2 | Fluorite | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore | ||||
| 4 | Galena | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Epidote | Alteration | Saussuritization | 1 | Unknown | Disseminated |
Dec 07, 2005 (D McKay) - Vein mineralogy is dominated by white quartz; purple fluorite, pink barite and fine-grained, disseminated pyrite and rare galena are minor constituents. The veins appear to have a mineral zonation with fluorite in the center of more barite rich sections. Several composite barite veins contain sulphide zones. Pyrite is the most abundant sulphide, and massive sections of pyrite up to 10 cm wide are observed. Minor galena is also present in on section of the Lakeshore vein. The barite-fluorite +/- sulphide veins are observed across a 150 m section of Trans Canada Hwy. 17. One 3 m wide composite vein strikes 144 degrees and dips 84 degrees southwest. A barite rich section of this vein up to 70 cm wide, strikes 170 degrees and dips 70 degrees west. Grab samples of vein material collected by OGS staff in 1992 returned assay values up to 0.002 ounce Au/ton, trace Ag, 86 ppm Zn, 65 ppm Cu and <10 ppm Pb.
Dec 07, 2005 (D McKay) - Anastomosing vein networks and breccias are common and typically display argillic alteration and some epidotization. The granite hosting the veins is locally saussuritized and displays a green epidote colour.
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:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 538-539 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist files, Schreiber-Hemlo district
Publication Number: Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Geological series, Precambrian geology of the Schreiber area, west part, Thunder Bay District
Publication Number: P2390 Scale: 1:15,840 Date: 1981
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office