Ontario Geological Survey
Permanent Link to this Record:
MDI000000002033
| Record Name(s) | Fork Zone - 2003 |
|---|---|
| Related Record Type | |
| Record Status | Prospect |
| Date Created | 2016-Oct-31 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Andrew Tims |
| Revised By | Therese Pettigrew |
Primary Commodities: Gold
Township or Area: Baird
Latitude: 50° 57' 30.75" Longitude: -93° 55' 47.99"
UTM Zone: 15 Easting: 434685 Northing: 5645626.42 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 52K13NW
Point Location Description: Assessment and GoogleEarth
Location Method: Based on Assessment
Access Description: From the town of Red Lake, traves southwest on Provincial secondary Highway 618 for 111kms. Turn right on to the Flat Lake/Suffel Lake forestry access road and park. The Zone is 100 m to the north.
2003: Under option from Claude Resources, Placer Dome completed two surface boreholes (1,671 metres) on a target termed the Fork zone. 2004: Placer Dome drilled 45 DDH totalling 3572 m. 2007-2009: Claude Resources undertook follow-up drilling on 30- to 40-metre spacing completing 105 diamond drill holes totalling 45,179 m. 2014-2015: Exploration carried out by Pure Gold included prospecting, mapping and sampling plus 12 diamond drill holes (3,349 metres) on the Fork zone target. No assessment reports were found on file.
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Red Lake
Tectonic Assemblage: Balmer
Geological Age: Archean
Metamorphism Type: Contact
Metamorphism Grade: Amphibolite
Oct 31, 2016 (Andrew Tims) - Rocks in the Madsen mine area have been metamorphosed to amphibolite facies. The area is positioned within the contact aureole of the Neoarchean Killala-Baird batholith situated directly west and dated at approximately 2,704 Ma.is located on the southeast-facing, southern limb of a large fold or domal structure.The zone is near the contact of the Balmer assemblage to the northwest and Confederation assemblage to the southeast. This contact represents an angular unconformity with both assemblages.
| Rock Type | Rank | Composition | Texture | Relationship | Mafic lava flow-unsubdivided | 1 |
|---|---|---|---|---|
| Ultramafic-Unsubdivided | 2 | |||
| Ultramafic lava flow-unsubdivided | 3 |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Sphalerite | Economic | Ore | ||||
| 4 | Gold | Economic | Ore |
Oct 31, 2016 (Andrew Tims) - Replacement-style and vein-hosted mineralization follow shallow southeast plunge Three phases of folding recognized, the latter two correspond to more widely recognized F1 and F2. Pure Gold borehole PG15-037 tested southern limit of the Fork zone and intersected 3.9 g/t gold over 12.1 metres. The thickest and highest grade gold mineralization is located within a flat southwest plunging zone controlled by a roll in the contact between pillowed Balmer assemblage basalt and the Russet Lake ultramafic unit. Significant mineralized intersections Pure Gold drilling at the Fork Zone include 14.6 g/t over 1.8 m in hole PG14-006 and 6.7 g/t over 2.0 m in hole PG14-009.
Nov 30, 2020 (Therese Pettigrew) - The Fork zone target area is located 1,300 metres southwest of the Madsen mill complex and is host to replacement style gold mineralization associated with folded lithological contacts. Current geological based on recent drilling by Pure Gold suggests that the thickest and highest grade gold mineralization is located within a flat southwest plunging zone controlled by a roll in the contact between pillowed Balmer assemblage basalt and the Russet Lake ultramafic unit. Discordant, steeply dipping north trending zones of silicification control high grade mineralization with the highest grades developed where these structures cut lithologic contacts. In 2003, Placer Dome completed two surface boreholes (1,671 metres) on a target termed the Fork zone. They tested the flexure point at the convergence of the Starratt-Olsen trend (southwest) and the Madsen mine trend (northeast). The boreholes intersected highly altered and deformed basalts and ultramafic rocks. The best intercept was 4.0 g/t gold over 1.2 metres. The West Fork zone (WF zone) was tested by five boreholes (1,529 metres) in 2004 and returned two significant intercepts of 6.1 g/t gold over 2.8 metres and 7.5 g/t gold over 1.5 metres. The area southeast of the Fork zone was tested with seven boreholes totalling 2,043 metres. This drill program discovered two new zones named AD and BC on the eastern mafic-ultramafic contact and the WC zone on the western contact. The AD and BC zones are characterized by brecciated, veined, and strongly altered (silica, biotite, chlorite) basalt with 1 to 3 percent pyrite, chalcopyrite, sphalerite, and visible gold. Assays from the AD zone range from 1.1 g/t gold over 4.2 metres to 47.0 g/t gold over 1.3 metres. Assays from the BC zone returned similar values. Drilling in this area also intersected a mineralized zone interpreted to represent an extension to the McVeigh horizon, situated less than 500 metres along strike to the northeast. Two other boreholes (917 metres) were drilled in the vicinity of the Fork zone. They intersected basalt, komatiite, and lesser pyroxenite and sediments. Several intervals of anomalous gold values (0.1 to 0.7 g/t gold) in association with pathfinder elements were encountered. DDH RUM-08-49 returned 13.91 g/t Au over 8.39 m and 28.59 g/t Au over 2.25 m. DDH RUM-08-52 returned 13.4 g/t Au over 6.7 m. DDH RUM-08-68 returned 33 g/t Au over 2 m. DDH RUM-08-78 returned 8.53 g/t Au over 4.93 m. DDH PDM04-318 returned 46.97 g/t Au over 1.53 m. DDH SUR-S-10700-na returned 32.23 g/t Au over 1.53 m. DDH SUR-S-11200-ne returned 15.09 g/t Au over 1.52 m. DDH SUR-S-11400-nc returned 15.77 g/t Au over 7.62 m (Cole et al., 2016).
MonoMap - Geology of the eastern part of Baird Township, District of Kenora
Publication Number: R039 Scale: Date: 1997
Author: Ferguson S.A.
Publisher Name: Ontario Dept. of Mines
MonoMap - Precambrian Geology of the East Part of Baird Township and Heyson Township
Publication Number: OFR5870 Scale: Date: 1993
Author: Atkinson B.T.
Publisher Name: Ontario Geological Survey
Publication - NI 43-101 Technical Report on the Preliminary Economic Assessment Red Lake Area, Ontario, Canada
Publication Number: 2016 NI 43-101 Scale: Date: 2016
Author: Cole, G., Niemela, K., Folinsbee, J.
Publisher Name: Pure Gold Mining Inc.
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 Red Lake Resident Geologist District Office