Ontario Geological Survey
Permanent Link to this Record:
MDI53B09NW00005
| Record Name(s) | OLP - Areas No. 6 and 8 - 1988, Thurston Bay - NE - 1988 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1995-May-23 |
| Date Last Modified | 2022-Mar-02 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Skinner Lake Area
Latitude: 52° 40' 21.22" Longitude: -90° 26' 1.25"
UTM Zone: 15 Easting: 673511.46 Northing: 5838937.43 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 53B09NW
Point Location Description: Sample 23020 on map in Assessment report 53B09NW0004
Location Method: Data Compilation
1981-82: Geophysical, geological and geochemical surveys, trenching and prospecting by 493217 Ontario Ltd. 1985-88: Geological mapping, prospecting, trenching and diamond drilling by Van Horne Gold Explorations Inc., Oracle Resources Ltd. and Power Explorations Inc.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 53B09NW0025 | 53B09NW0027 | 53B09NW0027 |
| 2.5608 | 53B09NW9424 | 53B09NW9424 |
| 2.11399 | 53B09NW0004 | 53B09NW0004 |
Province: Superior
Subprovince: Berens River
Terrane: North Caribou
Domain: North Caribou Core
Belt: North Caribou
Geological Age: Mesoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Adjacent | ||
| Vein | 3 | Quartz | Host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Calcite | Economic And Alteration | Gangue | Carbonatization | 1 | Unknown | Disseminated |
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Chalcopyrite | Economic | Ore | ||||
| 4 | Arsenopyrite | Economic | Ore | ||||
| 5 | Magnetite | Economic | Ore | ||||
| 2 | Tourmaline | Economic | Gangue | ||||
| Limonite | Alteration | Hematization | 3 | Unknown | Disseminated |
Mar 18, 2008 (Mark Puumala) - The OLP Area No. 6 zone is hosted within the mafic metavolcanic rock-dominated South Rim unit of the McGruer assemblage (Thurston, Osmani and Stone 1991). Elliott and Corkery (1988) described the rocks in the immediate area of the occurrence as consisting of several bands of lean iron formation within mafic flows. The iron formation bands range in thickness from 0.3 to 1.5 m and consist of limonitic chert with minor magnetite laminae. The iron formation bands are locally folded (folds with z-asymmetry), with axial planes oriented 160/90 and fold axes plunging 38 to 45 degrees to the northwest. The lean iron formation is reported by Elliott and Corkery (1988) to be locally mineralized with trace to 1% stringer pyrrhotite and trace to 1% disseminated arsenopyrite and chalcopyrite. Anomalous gold assays were reported to have been obtained from the mineralized iron formation, and from an iron formation-hosted quartz vein. The most notable results included a 0.3 m chip sample across a band of iron formation that assayed 3115 ppb Au and a grab sample from a 5 cm wide limonitic quartz vein with trace chalcopyrite and pyrrhotite that assayed 2610 ppb Au. OLP Area No. 8 is located approximately 100 m east of Area No. 6 (Elliott and Corkery 1988), and hosts a similar style of mineralization. This mineralized zone was trenched in 1982 by 493217 Ontario Limited (Hodge 1982) and diamond drilled by Van Horne Gold Exploration in 1985 (Adams 1985). The earlier trenching was reported by Hodge (1982) to have produced an assay result of 0.056 oz/ton Au over 0.6 m, while Elliott and Corkery (1988) reported a channel sample assay of 560 ppb over 0.58 m in gossaned, chert-rich sediments with 5 to 7% pyrite. Diamond drill hole OP-85-12 was reported by Adams (1985) to have encountered gold-bearing intercepts of between 0.01 and 0.02 oz/ton Au from quartz, quartz-pyrrhotite and quartz-calcite-tourmaline veins.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
| 2 | Vein |
Article - Northwestern Superior province: review and terrane analysis
Publication Number: SV04-01.005 Scale: Date: 1997
Author: Thurston P.C., Osmani I.A., Stone D.
Publisher Name: Ontario Geological Survey
Location:
Mono - Mineral Occurrences of the Central North Caribou Terrane
Publication Number: OFR6256 Scale: Date: 2011
Author: Puumala M.A., Bennett N.A.
Publisher Name: Ontario Geological Survey
Location:
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