Ontario Geological Survey
Permanent Link to this Record:
MDI52P12SW00004
| Record Name(s) | Kaw River - 1990, First Loon Lake # 1 - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1990-Nov-29 |
| Date Last Modified | 2022-Jun-07 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Firstloon Lake Area
Latitude: 51° 34' 9.71" Longitude: -89° 58' 18.66"
UTM Zone: 16 Easting: 294050 Northing: 5717329 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P12SW
Point Location Description: DDH Database.
Location Method: Conversion from MDI
1946: Magnetic survey by Bankur Patricia Gold Mines. 1971: Airborne VLF-EM and magnetometer surveys by Umex and Inco. 1972: Diamond drilling by Umex. 1984 Ground geophysical and geological surveys by Van Horne Gold Exploration. 1986: Humus geochemical sampling by Geocanex. 1986: Diamond drilling by Power Explorations.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52P12SW0024 | 52P12SW0040 | 52P12SW0040 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Pickle Lake
Geological Age: Archean
Nov 14, 2006 (Mark Puumala) - The Kaw River gold occurrence is located in the northeastern portion of the Pickle Lake Greenstone Belt within a northeast-striking sequence of supracrustal rocks defined by Stott (1996) as the Pickle Crow Assemblage. According to Young (2003), this assemblage is dominated by massive and pillowed mafic metavolcanic flows with subordinate gabbroic sills. The mafic metavolcanics are intercalated with thin, laterally continuous banded iron formation and small, discontinuous lenses of intermediate metavolcanics. All lithologies are intruded by semi-concordant feldspar porphyry dikes. Stratigraphy generally faces toward the northwest, except where asymmetric folding (mainly in the Pickle Crow mine area) has caused reversals in the younging direction (Young 2003). The minimum age of this assemblage is estimated to be 2860 Ma, based on a U-Pb zircon date obtained from a quartz porphyry intrusion (Stott 1996). To the southeast, younger metavolcanic rocks interpreted to be part of the Confederation Assemblage have been identified by Young (2003). These rocks consist of intercalated mafic and intermediate metavolcanics. Rocks in the vicinity of the Kaw River occurrence are characterized by a strongly-developed northeast-striking schistosity that dips steeply (approx. 80) to the northwest. These strongly-deformed rocks also exhibit extensive silica and carbonate alteration (Young 2003). This deformation zone extends toward the southwest, to the Pickle Crow mine area. Young (2003) attributes this deformation to a D2 deformation event that also produced folds in the Pickle Crow and Central Patricia mine areas. These folds include an anticline to the northwest, and a syncline to the southeast. Axial surfaces strike southwest and dip steeply to the northwest, with moderate to steep northeast-plunging hinge lines (Young 2003).
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 | Contains |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Pyrite | Economic | Ore |
Nov 14, 2006 (Mark Puumala) - The geology in the immediate vicinity of the Kaw River occurrence is summarized by Joliffe (1987) as consisting predominantly of intermediate flows, mafic tuffs and flows, with an intermediate intrusion and banded iron formation, while Ontario Geological Survey Map No. P3057 (Stott et al. 1989) indicates the presence of massive and pillowed mafic metavolcanic flows, gabbro and iron formation. The metavolcanics are commonly indicated to be carbonatized and silicified. Shear/breccia zones containing quartz-calcite veinlets and carbonatization were also identified in the drill core for diamond drill hole KAW-86-5 (Joliffe 1987). The two significant gold-mineralized sections in this drill hole were logged as a shear zone containing quartz-carbonate bands, and a moderately carbonatized intermediate flow. The highest reported assays from this drill hole were 0.08 oz/ton Au over 0.7 feet in the shear zone and 0.1 oz/ton Au over a width of 5 feet in the moderately carbonatized flow.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
Map - Geological series, Precambrian geology, Pickle Lake area, eastern part
Publication Number: P3057 Scale: 1:50,000 Date: 1989
Author: Stott G.M., Brown G.H., Coleman V.J., Green G.M., Reilly B.A.
Publisher Name: Ontario Geological Survey
Location:
Mono - The Geology and Tectonic History of the Central Uchi Subprovince
Publication Number: OFR5952 Date: 1996
Author: Stott G.M.
Publisher Name: Ontario Geological Survey
Location:
Thesis - New Structural, Geochronological, and Geochemical Constraints on the Tectonic Assembly of the Archean Pickle Lake Greenstone Belt, Uchi Subprovince, Western Superior Province
Publication Number: MSc thesis Date: 2003
Author: Young, M.D.
Publisher Name: Queen's University, Kingston
Location: Thunder Bay RGP
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 North Resident Geologist District Office