Ontario Geological Survey
Permanent Link to this Record:
MDI000000000371
Record Name(s) | J&R Trench - 2007 |
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Related Record Type | |
Record Status | Occurrence |
Date Created | 2007-Aug-31 |
Date Last Modified | 2022-Jan-05 |
Created By | Shannon Zurevinski |
Revised By | Therese Pettigrew |
Primary Commodities: Gold
Secondary Commodities: Copper, Lead, Zinc, Silver
Township or Area: Moss
Latitude: 48° 33' 3.88" Longitude: -90° 49' 35.27"
UTM Zone: 15 Easting: 660397 Northing: 5379834 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 52B10SW
Point Location Description: Field Visit
Location Method: Field Visit with GPS
Access Description: Approximately 120 kms W of Thunder Bay. The property is accessed via Hwy #11 W of Kashabowie for 15.6 kms where the Swamp Road and West Hermia are taken for 16 kms to the eastern boundary of the Larose property.
1989: Noranda Exploration completed some glacial till sampling and limited trenching. 2003: R. Kwiatkowski (prospector) sampled rusty schist yielding very anomalous gold grades and recorded as the original discovery of the Larose showing then optioned it to Freewest Resources Canada Inc. 2003-2004: Freewest Resources Canada Inc. carried out prospecting, line cutting, soil geochemistry, magnetometer and IP surveys, 30 DDH (2 742 m), trenching and geological mapping. May 2011: Freewest optioned the property to Viking Gold Exploration Inc. Dec 2011: Golden Share Ltd. JVed the property to acquire 50% and performed line cutting, magnetometer survey and soil geochemistry. 2012: Golden Share contracted SRK Consulting to complete a structural geology study. 2015: Viking Gold Exploration transferred the property to R. Kwiatkowski who then transferred title to Tashota Resources. 2016: Tashota Resources completed trench mapping and 5 DDH totalling 240.49 m, with DDH under the P1 trench. An airborne time-domain EM, magnetic and radiometric survey was flown by Prospectair Inc.
Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
---|---|---|
2.52224 | 20000007313 | 20000007313 |
2.53456 | 20000007501 | 20000007501 |
2.57089 | 20000014552 | 20000014552 |
2.57070 | 20000014550 | 20000014550 |
2.30136 | 20000000768 | 20000000768 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Shebandowan
Geological Age: Archean
Feb 27, 2017 (B Schnieders) - The Larose property was optioned to Freewest Resources Canada Inc., whose prospecting and stripping programs led to the discovery of several gold zones or occurrences, including (from the southwest to the northeast): the J and R, Larose, the P, Central P, Snoopy, Porphyry and Northwest View. Combined, these zones make up the ‘Main Zone’, which has a strike length of 1500m (Freewest Resources Canada Inc. Press Release November 11,2003). Two separate shear zones are observed at the Larose occurrence at 48/70NW. The shear zones are up to 7m wide and hosted in thinly bedded, turbiditic wacke and siltstone. The sheared and altered, host metasedimentary rocks display quartz veining and stringers, chloritization, silicification, carbonatization, seritization and sulphidization. Fine-grained pyrite and pale visible gold occur in the milky-white to maroon quartz stringers. Sugary, recrystallized quartz veins and pods are up to 30 cm wide. A chip sample collected by the authors across 30cm of the altered metasedimentary host and quartz stringers assayed 70.6 g/t gold (Resident Geologist Files, Thunder Bay’s South District, Thunder Bay). A parallel shear zone on the same stripped outcrop is located 10m to the northwest of the aforementioned shear zone. The second shear zone is hosted in the ‘DE’ turbidites (southeast-younging). Bedding/cleavage relationships suggest tight to isoclinal folding is present. Here the shear zone is sulphide-rich. Galena, sphalerite, pyrite and arsenopyrite are associated with ‘rotten’ sugary quartz. 2016: In addition, it was observed that there are two structural fabrics present at this location. The first fabric strikes 225°-230°, dips 82° toward the northwest and approximately parallels bedding, while the second fabric, which includes the mineralized shear zones described above, strikes 055°-060° and dips 80° toward the southeast. The late extensional quartz veins strike 310°-315° and dip 75° toward the northeast. Some of these veins display sigmoidal geometry consistent with late dextral shearing.
Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Host |
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Wacke | 2 | Host | ||
Siltstone | 3 | Host | ||
Syenite | 4 | Adjacent |
Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
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2 | Pyrrhotite | Economic | Ore | ||||
3 | Galena | Economic | Ore | ||||
4 | Sphalerite | Economic | Ore | ||||
5 | Arsenopyrite | Economic | Ore | ||||
6 | Gold | Economic | Ore | ||||
1 | Pyrite | Economic | Gangue | ||||
Sericite | Alteration | Sericitization | 1 | Unknown | Disseminated | ||
Chlorite | Alteration | Chloritic | 2 | Unknown | Disseminated |
Jan 03, 2013 (Shannon Zurevinski) - Gold mineralization is intimately related to a continuous high strain zone known as the Larose shear zone (LSZ), that has been traced over a minimum 4 km strike length. The LSZ trends to the northwest (050°), dips subvertically and attains a maximum width of about 25 metres. It is a sinistral shear zone that contains several gold zones occurring as discrete shoots within it. The LSZ hosts quartz veins, quartz vein stockwork and sulphide disseminations enclosed by greywacke host rocks characterized by heavy alteration. The quartz veins contain and wallrock disseminations comprise pyrite, galena, sphalerite, chalcopyrite, arsenopyrite and visible gold. The geological setting at Larose has been compared to that of the Malartic district of Quebec, which comprises host rocks of greywacke, quartz-feldspar porphyry and syenitic intrusive rocks.
Aug 31, 2007 (Q Unknown) - several shear zones up to 79.2 g per t Au
Rank | Classification |
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1 | Lode (Gold) |
Rank | Characteristic |
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1 | Sheared |
Date: Oct 03, 2016
Geologist: Dorothy Campbell
Notes: The Larose shear zone hosts numerous high-grade gold occurrences that have been exposed along a strike-length of approximately 4.5 km. These mineralized zones are generally less than 1 m wide and display strong silicification and/or quartz veining along with sericite and carbonate alteration. Gold-bearing zones in the metasedimentary rocks are mineralized with sphalerite, arsenopyrite, pyrite and galena, while zones hosted in quartz-feldspar porphyry are typically mineralized with pyrite and pyrrhotite.
Date: Nov 16, 2016
Geologist: Mark Puumala
Notes: The high-grade gold zones have been deformed (e.g., boudinaged, folded) and are often oriented oblique to the main shear zone trend (rotated approximately 15 to 20° in a clockwise direction). Later cross-cutting quartz veins are generally not mineralized. These observations indicate that gold was introduced into the Larose shear zone relatively early in the deformation history
Map - Precambrian Geology, Moss Township
Publication Number: M2624 Scale: 1:20,000 Date: 1997
Author: Osmani I.A.
Publisher Name: Ontario Geological Survey
MonoMap - Geology and Mineral Potential, Greenwater Lake Area, West-Central Shebandowan Greenstone Belt
Publication Number: R296 Scale: Date: 1997
Author: Osmani I.A.
Publisher Name: Ontario Geological Survey
Mono - Report of Activities 2003, Resident Geologist Program, Thunder Bay South Regional Resident Geologist Report: Thunder Bay South Kenora District
Publication Number: OFR6129 Scale: Date: 2004
Author: Schnieders B.R., Scott J.F., O'Brien M.S., Magee M.A., Komar C.L.
Publisher Name: Ontario Geological Survey
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