Ontario Geological Survey
Permanent Link to this Record:
MDI52J02SW00016
| Record Name(s) | Mac-Read Vein - 1936, MacDonald-Read - 1936, Butt Option - 1995 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Prospect |
| Date Created | 1995-May-30 |
| Date Last Modified | 2023-Aug-03 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Fourbay Lake Area
Latitude: 50° 1' 45.74" Longitude: -90° 47' 55.21"
UTM Zone: 15 Easting: 657660 Northing: 5544218 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52J02SW
Point Location Description: Map in assessment report 52J02SW0004
Location Method: Based on Assessment
Access Description: Light aircraft can land on the lake in summer and winter. Boat and snowmobile access to the lake is possible from a number of Sturgeon Lake access points off Hwy. 599 between Cobb Bay and Trappers Point.
1936: Prospectors R.A. MacDonald and W.C. Read worked the property in 1936. 1937: T.L. Gledhill wrote a brief report on the property in Feb. 1937. Dr. Gledhill commented on a small stripped area and 9 drill holes situated at the west end of the property. 1937: During the winter, Denman Securities of Toronto financed drilling to explore the vein at depth. The drilling program was not encouraging. 1938-39: A pitting and sampling program carried out in 1938 and 1939 increased the known length of the vein. A 28.7 m long section of the vein was channel sampled to give an uncut gold content of 0.46 ounce gold per ton. 1939: Sylvanite Gold Mines Ltd. optioned the property in July and examined the vein. A section of the vein 16.7 m long previously sampled to contain 0.49 ounce gold per ton was resampled and gave 1.1 ounce gold per ton over 13.7 m. Sylvanite Gold Mines concluded that the potential tonnage did not warrant additional work and dropped the option in the fall of 1939. 1946: C.J. Ryan contracted H. Lundberg to conduct prospecting, magnetic and SP surveys. 1982: G. Armstrong and A. Best drilled a new vein system to the south of the Mac-Read prospect. Armstrong and Best optioned their property, which included the Mac-Read, to Steep Rock Resources, who in turn optioned portions of the property to Falconbridge Ltd., Hudson Bay Exploration and Almaden Resources during the period between 1983 to 1987. Surprisingly, little to no work was done on the Mac-Read prospect. 1990: Armstrong and Best regained control of the claim block and pumped out the southern pit to evaluate it for small scale mining. At the same time, the Mac-Read prospect was mechanically stripped and the area of exposed vein significantly increased. 1991: The Sioux Lookout Resident Geologist examined the prospect and suggested that it might have small scale mining potential. A. Best has since taken a 1 ton bulk sample. 1992: A. Best and G. Armstrong carried out stripping and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52J02SW-0024 | 52J02SW0056 | 52J02SW0056 |
| 52J02SW-0028 | 52J02SW0054 | 52J02SW0054 |
| OP93-248 | 52J02SW0003 | 52J02SW0003 |
| OP92-252 | 52J02SW0005 | 52J02SW0005 |
| OP91-585 | 52J02NE0002 | 52J02NE0002 |
| 52J02SW CQ-0072 | 52J01SW0101 | 52J01SW0101 |
| 52J02SW-0017-C1 | 52J02SW0013 | 52J02SW0013 |
| 52J02SW-0026-B1 | 52J02SW0044 | 52J02SW0044 |
| 52J02SW-0075-C1 | 52J02SW0008 | 52J02SW0008 |
| 52J02SW-0072 | 52J01SW0101 | 52J01SW0101 |
| 52J02SW-0023 | 52J02SW0037 | 52J02SW0037 |
Province: Superior
Subprovince: Wabigoon
Belt: Sturgeon Lake
Geological Age: Archean
Dec 07, 2005 (R Tuomi) - Both the Armstrong-Best and Mac-Read propects share common characteristics. Both are hosted in south facing, east trending pillowed metabasalt units. The grey to blue quartz veins are located in carbonate-silica replaced zones. So called iron formation is present in both prospects; in fact, a rusty, sulphidized zone would be a better description. Gold tenor in both prospects tends to follow sulphide content. Both prospects have recently been shown to terminate by folding to the north, probably by north trending shear zones.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz - Sulphide | Host |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Meta Basalt | Host | |
| Quartz Porphyry | 3 | Quartz | Near | |
| Gabbro | 4 | Gabbro | Dyke | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Gold | Economic | Ore | ||||
| 3 | Marcasite | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 5 | Pyrrhotite | Economic | Ore | ||||
| 6 | Sphalerite | Economic | Ore | ||||
| 7 | Galena | Economic | Ore | ||||
| 1 | Calcite | Economic | Gangue | ||||
| 2 | Quartz | Economic | Gangue | ||||
| Carbonate | Alteration | Carbonatization | 1 | Unknown | Disseminated | ||
| Quartz | Alteration | Silicification | 2 | Unknown | Disseminated |
Dec 07, 2005 (R Tuomi) - Two chip sampling studies done in 1939 produced assays on blue quartz veins of 0.46 ounce gold per ton over 28.7 m and 1.1 ounce gold per ton over a length of 13.7 m. The veins vary from 0.6 m to 1 m in width.
Dec 07, 2005 (R Tuomi) - Shearing and folding.
Article - Sioux Lookout Resident Geologist's District-1991
Publication Number: MP158.004 Page: 81-84 Date: 1997
Author: Janes D.A., Seim G.Wm., Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Geology of the Six Mile Lake area
Publication Number: OFR5838 Date: 1992
Author: Robinson D.J.
Publisher Name: Ontario Geological Survey
Location:
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