Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000000371

Record: MDI000000000371

General

Mineral Record Identification
Record Name(s) J&R Trench - 2007
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

Commodities

Primary Commodities: Gold

Secondary Commodities: Copper, Lead, Zinc, Silver



Location

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.



Exploration History

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.


Assessment Work on File

Assessment Work on File
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

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Shebandowan

Geological Age: Archean  



Geology Comments

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.




Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Vein 1 Host
Wacke 2 Host
Siltstone 3 Host
Syenite 4 Adjacent

Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
2PyrrhotiteEconomicOre
3GalenaEconomicOre
4SphaleriteEconomicOre
5ArsenopyriteEconomicOre
6GoldEconomicOre
1PyriteEconomicGangue
SericiteAlterationSericitization1UnknownDisseminated
ChloriteAlterationChloritic2UnknownDisseminated

Mineralization Comments

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



Mineral Record Details

Classification
RankClassification            
1 Lode (Gold)
Characteristics
Rank Characteristic            
1 Sheared

Site Visit Information

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



References

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


Report an Error

We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.


Terms of Use

Please review our Terms of Use agreement for this data product.


Ministry Contact Information

For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office