A Geodetic Survey of Canada Marker from 1936 mounted in the rock shoreline of Lake Minisinakwa. The stone cairn that the description mentions is long gone but the monument remains. This is one of the largest disks I have come across so far and measures in at approximatly 75mm in diameter.
Access
Make your way to the end of Poupore Street in the town of Gogama, Ontario. At the end of the road there is a public boat launch and parking at N47° 40.242 W081° 43.170. A quick 700m paddle will get you to the location of the monument.
Report
The latest vertical data has the elevation at 349.576m
Click here for the report