Ontario Geological Survey
Permanent Link to this Record:
MDI42D15SW00013
| Record Name(s) | Megatherium Occurrence - 1897, Jackfish Mining Syndicate - 1897, Winch Lake - 9999, A.L. 227 - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Mar-31 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper, Lead
Township or Area: Syine
Latitude: 48° 50' 9.83" Longitude: -86° 55' 24.29"
UTM Zone: 16 Easting: 505620 Northing: 5409235 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D15SW
Point Location Description: General location from discussion with prospector R. Wahl
Location Method: Data Compilation
Access Description: Bow (1897) gives a general location of 4 km northwest of Jackfish Station on Jackfish Bay and 2.8 km from the water. If the direction from Jackfish Station is northeast not northwest the location is locally known as Winch Lake. The showing is reported to be in a diverted creek bed. The location lies within Syine Township (claim map G-634). If the location is coincident with the Winch Lake occurrence access is from Highway 17, 1.2 km north of Sawmill Creek. At this point travel by foot east for 1.6 km to the south end of a small lake. Old equipment and a water filled shaft are found at the occurrence.
1897: Shaft (9 m deep) sunk; Jackfish Mining Syndicate. Because the exact location of the occurrence is not known, the extent to which the following work history is directly applicable to it is unknown. 1980: Manual surface work; A. Ferguson. 1983: Airborne geophysical survey (EM, VLF, MAG); R.A. Schiralli. 1985: Ground geophysical (EM, MAG), geochemical and geological surveys; R.A. Schiralli (?). 1985-1989: The occurrence was staked several times by various parties but no work was recorded. 2011-12: R. Renner, W. Richards and J. Hamel conducted prospecting and attempted without luck to locate the historic showing.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.52734 | 20000007780 | 20000007780 |
| 2.50799 | 20000007081 | 20000007081 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Geological Age: Archean
Dec 07, 2005 (D McKay) - Coleman (1898) states: On the east side of Jackfish Bay is the Megatherium mine, owned by the same company as the Mogotherium. As it was not working, and I was told there was nothing to be seen but a shaft full of water, I did not think it worth while to lose a day by stopping to examine it. A saw mill has been erected on the property to provide lumber for a stamp mill, which apparently will not be required for some time. Bow (1898) referred to the occurrence as: ...There is a large exposure of quartz 10 to 12 feet (3 to 3.7 m) wide, but which I am told is traceable only a short distance. It is in the bed of a small creek, and the water had to be dammed and turned...A shaft had been sunk to a depth of 30 feet (9 m), but was full of water at the time of my visit.
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Granite | 2 | Granite | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Galena | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Hydrothermal | 1 | Unknown | Veins |
Dec 07, 2005 (D McKay) - Hopkins (1922 p.18) describes the mineralogy: Further south in the granite is the Megatherium property which has a small white quartz vein carrying a little pyrite, chalcopyrite and galena which show the presence of gold on assay. Grab samples collected from the occurrence in 1984 by OGS Resident geologist staff returned assay values which varied from <0.01 to 0.004 opt Au and nil to <0.01 opt Ag.
May 04, 2018 (Therese Pettigrew) - Bow (1898) described the Megatherium showing as being a large exposure of quartz 3-3.6 m wide but only traceable a short distance. It was in the bed of a small creek, and the water had to be dammed and turned off into an artificial ditch which rejoined the creek farther down.
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
Part - Fourth report on the west Ontario gold region
Publication Number: ARV07-02.001 Page: 135-136 Date: 1998
Author: Coleman A.P.
Publisher Name: Ontario Bureau of Mines
Location:
Map - Jackfish-Middleton area, Thunder Bay District
Publication Number: M2107 Date: 1967
Author: Walker J.W.R.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Mines of northwestern Ontario
Publication Number: ARV07-01.003 Page: 82 Date: 1998
Author: Bow J.A.
Publisher Name: Ontario Bureau of Mines
Location:
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
Part - Schreiber-Duck Lake area
Publication Number: ARV30-04.001 Date: 1998
Author: Hopkins P.E.
Publisher Name: Ontario Dept. of Mines
Location:
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