Ontario Geological Survey
Permanent Link to this Record:
MDI42D13SE00005
| Record Name(s) | Moffat Strait - 1954, Addicks Canadian Properties Ltd. - 1970, Mentor Addicks - 1970 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Apr-01 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Secondary Commodities: Silver
Township or Area: Rossport Area
Latitude: 48° 49' 53.14" Longitude: -87° 44' 43.15"
UTM Zone: 16 Easting: 445301.86 Northing: 5408984.67 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D13SE, 42D13SW
Point Location Description: Diamond drill holes
Location Method: Conversion from MDI
Access Description: The occurrence is located at the north end of Moffat Strait between St. Ignace Island and Simpson Islands (claim maps G-54 and G-610). Access is by water from Nipigon or via aircraft to the north end of Moffat Strait.
1954-55: Horlak Mines conducted surface work and 8 diamond drill holes totalling 155 m were drilled. 1989: Prospecting and sampling were carried out by J. Ferguson and A. Ferguson.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 10 | 42D13SW8304 | 42D13SW8304 |
Province: Southern
Supergroup: Keweenawan Supergroup
Geological Age: Paleoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Basalt | Amygdaloidal | Host |
|---|---|---|---|---|
| Vein | 2 | Calcite | Host |
Dec 07, 2005 (B Nelson) - The showing consists of mineralized veins that cut the Osler amygdaloidal basalts.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcocite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Silver | Economic | Ore | ||||
| 1 | Calcite | Economic | Gangue | ||||
| 2 | Zeolite | Economic | Gangue |
Apr 29, 2019 (B Nelson) - The occurrence is classed as a 'polymetallic vein, volcanic-hosted copper' deposit. Trenching and drilling on the property in 1954-55 by Horlac Mines Limited uncovered 4 mineralized veins, each consisting of vertical, chalcocite-bearing calcite stringers occur in flat-lying amygdaloidal lava, and striking east-west. Three of the zones occur west of Moffat Strait on the northeast shore of St. Ignace Island and the fourth on the northwest shore of Simpson Island. The largest is 1.8 m wide; the smallest 7 cm wide. The total width of the mineralized zone containing the veins was estimated at 20 m. Drilling offshore in 1955 traced the veins for 15 m along strike under Moffat Strait. All 6 holes drilled in 1964 intersected chalcocite in calcite veins. These veins averaged 0.1% copper across a width of 0.6 m. Trace amounts of silver were also found. The average grade reported by Horlac Mines Limited was 0.8% copper. Two analyses indicated that small amounts of silver are present.
| Rank | Classification |
|---|---|
| 1 | Vein |
Date: Feb 05, 1997
Geologist: B Nelson
Notes: Staff from the Resident Geologist's Office visited the site in July of 1989.
File - 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:
Mono - Copper, nickel, lead and zinc deposits in Ontario (revised to February, 1957)
Publication Number: MDC002 Page: 50 Date: 1957
Author: Thomson J.E., Ferguson S.A., Johnston W.G.Q., Pye E.G., Savage W.S., Thomson R.
Publisher Name: Ontario Dept. of Mines
Location:
Map - St. Ignace Island and adjacent islands, Thunder Bay District
Publication Number: M2285 Scale: 1:63,360 Date: 1974
Author: Giguere J.F.
Publisher Name: Ontario Division of Mines
Location:
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 325 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of St. Ignace Island and adjacent islands, District of Thunder Bay
Publication Number: R118 Page: 28 Date: 1975
Author: Giguere J.F.
Publisher Name: Ontario Division of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 104 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office