Ontario Geological Survey
Permanent Link to this Record:
MDI42E12NE00020
| Record Name(s) | JORSCO Occurrence - 1984, A.G. Burrows - 1984, Thor Johansen - 1984 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1984-Jan-31 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Silver
Secondary Commodities: Gold, Copper, Zinc, Lead
Township or Area: Leduc
Latitude: 49° 40' 25.87" Longitude: -87° 33' 33.74"
UTM Zone: 16 Easting: 459640.969 Northing: 5502519.4 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E12NE
Point Location Description: Railway rockcut.
Location Method: Data Compilation
Access Description: The property is located in south central Leduc Township, between Blackwater Lake and Blackwater Bay. The claims are located 2.2 km west of Jellicoe and are readily accessible by Trans Canada Highway 11, which lies approximately 200 m to the north of the showing. The main line of the Canadian National Railway crosses the property.
1917: The occurrence was discovered by A.G. Burrows of the Ontario Division of Mines. 1936: Claims staked to cover the occurrence. 1962: Geological survey was conducted and three holes totalling 215.8 m were drilled. 1963: Mag and EM surveys were conducted and 19 holes totalling 1,260.4 m were drilled. 1969: Canadian Nickel Co. Ltd. drilled 4 holes totalling 272.6 m. 1970-1984: Claims staked and cancelled several times. 1986: Claims held by Daniel Deschenes.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 13 | 42E12NE0061 | 42E12NE0061 |
Province: Superior
Subprovince: Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Sheared Flow | Host |
|---|---|---|---|---|
| Gabbro | 2 | Gabbro | Near | |
| Vein | 3 | Quartz Stockwork | Host |
Jan 13, 2010 (B Nelson) - The area is underlain by small lenses of mafic metavolcanics and gabbroic intrusives that are surrounded by metasediments, then pyritic bands are present in the metavolcanics. At the south part of the property there is an isolated occurrence os Keewatin basic volcanics which are strongly sheared and surrounded by younger Timiskaming sediments. A quartz stockwork is related to the footwall side of the shear, and there is evidence of fracturing in a NNE direction. Mineralization is found in a quartz rich blocky structure. Py and cp are present in both the shear and the stockwork. It is evident that the gold and gold-silver bearing structures are related to the east-northeast-trending shears. From the exposures seen, there are two ages of quartz carrying pyrite, pyrrhotite, chalcopyrite, argentiferous galena as well as free gold. The shear zone is exposed for 61.3 m and true width is reported to be 6.2 to 9.3 m. The zone is open horizontally and vertically. Drilling completed by Jorsco indicated a greater true width at depth (up to 15.5 to 18.6 m).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Galena | Economic | Ore | ||||
| 3 | Gold | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 5 | Sphalerite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Disseminated |
Jan 13, 2010 (B Nelson) - Assays reported for the showing by Williams (1962) include two samples with values of 0.01 oz/ton Au and 0.04oz/ton Au. To the northeast of the showing, a rusty shear assayed 0.01 oz/ton Au and 0.10oz/ton Au. To the south of the showing, chip samples yielded values of 1.03 oz/ton Au and 0.14 oz/ton Au. Silver values of 4.39 oz/ton and 5.44 oz/ton were attained. To the southwest, a grab sample from a trench assayed 0.04 oz/ton Au, 5.26 oz/ton Ag and 2.16% Cu. Four holes drilled by Jorsco Exploration intersected values from 0.03 to 0.04 oz/ton Au.
| Rank | Characteristic |
|---|---|
| 1 | Vein |
Date: Jan 03, 1997
Geologist: B Nelson
Notes: The Beardmore-Geraldton Economic Geologist visited the occurrence May 2, 1981.
Map - Tashota-Geraldton sheet, geological compilation series, Thunder Bay and Cochrane districts
Publication Number: M2102 Date: 1997
Author: Pye E.G., Harris F.R., Fenwick K.G., Baillie J.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Walters and Leduc townships, Thunder Bay District
Publication Number: M2356 Scale: 1:31,680 Date: 1976
Author: Mackasey W.O.
Publisher Name: Ontario Division of Mines
Location:
Map - Thunder Bay data series, Nezah Lake area, Thunder Bay District
Publication Number: P2517 Scale: 1:15,840 Date: 1982
Author: Speed A.A.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of Walters and Leduc townships, District of Thunder Bay
Publication Number: R149 Date: 1976
Author: Mackasey W.O.
Publisher Name: Ontario Division of Mines
Location:
Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane
Publication Number: OFR5630 Date: 1986
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Part - Longuelac to Jellicoe and Orient Bay
Publication Number: ARV26.007 Date: 1998
Author: Burrows A.G.
Publisher Name: Ontario Bureau of Mines
Location:
Mono - Gold deposits of Ontario, part 1, districts of Algoma, Cochrane, Kenora, Rainy River, and Thunder Bay
Publication Number: MDC013 Date: 1971
Author: Ferguson S.A., Groen H.A., Haynes R.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Part - Mining operations in 1959
Publication Number: ARV69-02 Date: 1997
Author: Mines Inspection Branch
Publisher Name: Ontario Dept. of Mines
Location:
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