Ontario Geological Survey
Permanent Link to this Record:
MDI42L06NE00019
| Record Name(s) | Shields-Evans-Jackson Occurrence - 1983 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-23 |
| Date Last Modified | 2023-Aug-03 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Zinc
Township or Area: O Sullivan Lake Area
Latitude: 50° 25' 56.95" Longitude: -87° 7' 36.12"
UTM Zone: 16 Easting: 491001.58 Northing: 5586726.09 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42L06NE
Point Location Description: General - claim 747197 on 1984 claim map
Location Method: Data Compilation
Access Description: The property is located approximately 100 km north-northeast of Geraldton at Osulake Peninsula on the west shore of O'Sullivan Lake. Travel the Nakina Highway (Highway 584) north from Geraldton for 56 km. Turn northwest on the Kimberley Clark main haul road (Highway 643) for 42 km to Consolidated Louanna Mine turn-off. Park at the entrance to the O'Sullivan Resort.
1983: Four claims were staked by Jay Shields, a Geraldton prospector, on February 20, 1983. A minor amount of trenching and stripping was completed.
Province: Superior
Subprovince: Wabigoon
Terrane: Eastern Wabigoon
Belt: Onaman-Tashota
Geological Age: Archean
Dec 07, 2005 (B Nelson) - In general, the area south of the Kawashkagama River, which flows into O'Sullivan Lake, consists of altered, undifferentiated, basic to intermediate volcanic flows, tuffs and pillowed lavas. This unit underlies the southern portion of the property and also hosts the Consolidated Louanna gold deposit, situated 1 km to the east on Osulake Peninsula. The region north of the river is occupied by sheared metadiabase, diorite, gabbro and further to the north, granite and quartz diorite intrusions. Locally, a high degree of shearing is evident in diorite outcrops along a swampy creek which traverses the property northeast-southwest and would seem to indicate the presence of a minor fault. Two mineralized showings associated with quartz veining have been uncovered on the property. Showing No. 1 on claim TB747197 to the southeast is an 8 to 10 m exposed shear zone (strikes 56 degrees and dips steeply to the NW) containing en echelon, dull grey quartz veining. Two generations of veining are evident; one cross-cutting the shear, and the main vein, which widens from 10 cm to nearly 50 cm in the southwest, where it disappears under a swamp. Shearing is well displayed at this point, where the tuffaceous volcanic wall rock and quartz exhibit an almost banded appearance.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Flows | Near |
|---|---|---|---|---|
| Intermediate lava flow-unsubdivided | 2 | Flows | Near | |
| Mafic Tuff | 3 | Tuffaceous | Near | |
| Intermediate Tuff | 4 | Tuffaceous | Near | |
| Mafic pillowed flow | 5 | Pillowed | Near | |
| Intermediate pillowed flow | 6 | Pillowed | Near | |
| Diabase | 7 | Diabase | Near | |
| Gabbro | 8 | Gabbro | Near | |
| Granite | 9 | Granite | Near | |
| Quartz Diorite | 10 | Quartz-Diorite | Sheared | Near |
| Vein | 11 | Quartz | Host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Sphalerite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Disseminated |
Dec 17, 2020 (B Nelson) - Mineralization is generally sparse, with the exception of a highly gossaned sulphide 'zone' in the SW wall of the trench, which contains from 10 to 15% pyrite. Minor zinc mineralization was also reported. Gold is also associated with outwash sand and gravel. A total of 8 samples were collected by the Beardmore-Geraldton Economic Geologist for gold assay. Samples 84-MJS-1 to 84-MJS-6 were from the south showing (No. 1) and 84-MJS-7 to 84-MJS-8 were taken from the north showing across the creek. All samples showed only trace amounts (<0.01 oz/ton) Au. Previous reported assays by the owner from a 0.5 m section of quartz vein (Showing No. 1) range from 0.06 to 0.09 oz/ton Au (Mason and White, 1986).
Dec 17, 2020 (Therese Pettigrew) - Jay Shields, George Evans, and Paul Jackson of Geraldton have a placer gold occurrence immediately southwest of O'Sullivan Lake. Gold can be detected in some cases by assay, or by panning in an outwash esker environment in gravel pits along Highway 643 and along the access road into the Consolidated Louanna Gold Mine. Sections in the pits consist of interbedded coarse pebble to fine sandy, silt beds. The beds are 5 to 10 cm in thickness. Grab samples have yielded assays that range from trace amounts to 0.28 ounce gold per ton (Geoscience Laboratories, Ontario Geological Survey, Toronto) (Patterson et al., 1983).
Date: Jan 20, 1997
Geologist: B Nelson
Notes: The Beardmore-Geraldton Economic Geologist visited the occurrence June 19, 1984.
Map - O'Sullivan Lake area, District of Thunder Bay, Ontario
Publication Number: M1955-02 Scale: 1:12,000 Date: 1997
Author: Moorhouse W.W.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Gold occurrences, prospects, and deposits of the Beardmore-Geraldton area, districts of Thunder Bay and Cochrane
Publication Number: OFR5630 Page: 529-530 Date: 1986
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Article - 1982 report of the Thunder Bay Resident Geologist
Publication Number: MP107.004 Page: 67-68 Date: 1997
Author: Patterson G.C., Mason J.K., Schnieders B.R.
Publisher Name: Ontario Geological Survey
Location:
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:
Part - Geology of the O'Sullivan Lake area
Publication Number: ARV64-04 Date: 1997
Author: Moorhouse W.W.
Publisher Name: Ontario Dept. of Mines
Location:
Folio - O'Sullivan Lake area, District of Thunder Bay
Publication Number: GDIF017 Date: 1997
Author: Thunder Bay RGO
Publisher Name: Ontario Geological Survey
Location:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
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