Ontario Geological Survey
Permanent Link to this Record:
MDI52K13NW00020
| Record Name(s) | Madsen No.7 Vein - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Mar-10 |
| Date Last Modified | 2022-Sep-27 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Baird
Latitude: 50° 57' 46.27" Longitude: -93° 54' 23.32"
UTM Zone: 15 Easting: 436342.585 Northing: 5646085.004 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 52K13NW
Point Location Description: SE part of KRL 12525, 345 M W of #2 post and along geologic contact
Location Method: Data Compilation
1927-1935: Prospecting and trenching carried out by X. Hahn, and M. Madsen. 1935: Madsen Red Lake Gold Mines Incorporated. 1935 CHANNEL SAMPLES-VEIN'S EASTERN END: AVE. 8 SAMPLES YIELDED 0.44 OPT AU OVER A WIDTH OF 0.36 M FOR 22.6 M (LENGTH), 1935 CHANNEL SAMPLES-37 M TO THE WEST: AVE. 3 SAMPLES: 0.61 OPT AU OVER 0.15 M FOR 9.1 M LENGTH.
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Red Lake
Geological Age: Archean
Metamorphism Grade: Amphibolite
Dec 07, 2005 (K R Kettles) - The rocks in the area of Madsen Mines can be grouped into two sequences: a lower tholeiitic to komatiitic sequence and an upper calc-alkalic sequence. The tholeiitic-komatiitic sequence contains two parts as well: a lower part composed of tholeiitic pillowed basalt, which contains the Austin Shear Zone, the host for the gold deposits; and an upper part of tholeiitic-komatiitic felsic to intermediate volcanics with minor interspersed mafic volcanics. Gabbro sills and dikes are present throughout the tholeiitic-komatiitic sequence. The calc-alkalic sequence is composed of rhyolitic flows, tuffs, and breccias. The rocks vary in strike across the area. Near the Madsen Mine the strike of the rocks is 030 deg and the dip is 65 deg to the southeast. One kilometre NE of Madsen the strike is 45 deg dipping 70 deg southeast. Foliation generally strikes 45 to 60 deg and dips 70 deg southeast. The rocks are metamorphosed to amphibolite facies. The occurrence is situated in the upper part of the lower tholeiitic-komatiitic sequence near the contact with the calc-alkalic sequence. It is comprised of a quartz vein in sheared gabbro.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz W Minor Sulphides | Host |
|---|---|---|---|---|
| Gabbro | 2 | Gabbro | ,Sill/Dike - Sheared | Contains |
| Mafic lava flow-unsubdivided | 3 | Tholeiitic | Flows | Adjacent |
Dec 07, 2005 (K R Kettles) - The host rocks for the Madsen gold deposits are altered and sheared tholeiitic to komatiitic pillowed basalt. These rocks contain the Austin Shear zone which hosts the gold deposits in the area. They are overlain by tholeiiticfelsic to intermediate volcanic rocks previously thought to be part of the upper calc-alkalic sequence. The tholeiitic -komatiitic mafic volcanics are cut by gabbro sills and dikes. The Madsen No. 7 vein is situated in the upper part of the lower tholeiitic-komatiitic sequence near the contact with the calc-alkalic sequence. The occurrence is a quartz vein in sheared gabbro.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Gold | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue |
Dec 07, 2005 (K R Kettles) - The occurrence is situated in the upper part of the lower tholeiitic-komatiitic sequence near the contact with the calc-alkalic sequence. It is comprised of a quartz vein in sheared gabbro. The vein strikes 25 degs. It varies from 5 to 30 cm wide, and strikes for over 150 m. In places the wall rocks are also well mineralized. Total widths of vein and mineralized wall rocks range from 30 to 60 cm. Mineralization consists of Au, pyrite, pyrrhotite, and arsenopyrite. At the eastern end of the vein, an average of 8 channel samples yielded 0.44 oz/ton Au over 0.36 m for a length of 22.6 m. Approximately 37 m to the west 3 channel samples averaged 0.61 oz/ton Au over 0.15 m for a length of 9.1 m.
| Rank | Classification |
|---|---|
| 1 | Unknown |
| Rank | Characteristic |
|---|---|
| 1 | Sheared |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Unknown | 150 | .18 | 25 |
Date: Dec 07, 1996
Geologist: K R Kettles
Notes: N/A
File - Resident Geologist files AF RL 1940-73 Baird #30
Publication Number: AF BAIRD30 Date: 1940
Author:
Publisher Name:
Location: Red Lake RGP
Map - Baird Township, eastern part, Kenora District
Publication Number: M2072 Scale: 1:12,000 Date: 1997
Author: Ferguson S.A.
Publisher Name: Ontario Dept. of Mines
Location:
File - Resident Geologist files AF RL 1944-69 Baird #42
Publication Number: AF BAIRD42 Date: 1944
Author:
Publisher Name:
Location: Red Lake RGP
Mono - Gold occurrences, prospects, and deposits of the Red Lake area, volumes 1 and 2
Publication Number: OFR5558 Page: 37-38 Date: 1987
Author: Durocher M.E., Burchell P.S., Andrews A.J.
Publisher Name: Ontario Geological Survey
Location:
File - 1935 Resident Geologist's Files, Red Lake
Publication Number: AF RL 1935 Date: 1935
Author: Honsberger, A.H.
Publisher Name:
Location: Red Lake RGP
Part - Gold deposits in the vicinity of Red Lake
Publication Number: ARV44-06.001 Page: 35-36 Date: 1997
Author: Hurst M.E.
Publisher Name: Ontario Dept. of Mines
Location:
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