I'm not sure if any of you are aware of this but the Ontario Ministry of Northern Development and Mines has a plugin devloped for Google Earth.
It basically lets you see most of the geology in Ontario but with all historical survey data overlaid.

So for example if you wanted to see the magnetic survey for Hercules you could search for Jellicoe, On or wherever and zoom right in using Google Earth. I'm not explaining it well but its VERY cool!!
The new Google Earth is awesome and you can add weather, traffic, photos for site seeing and embedded full photo-realistic 3D cities and things like that. (totally free of course)
http://earth.google.com/
After thats installed you can download OGS Earth to see Hercules etc. (OGS Earth 2 is below so its not relevant in this case). The plugin includes most of the Ontario mining surverys including magnetic, gravity etc. Go here to download it (third link from the bottom):
http://www.mndm.gov.on.ca/mines/geol...
Basically you just have to unzip it and click the .kml file and it will launch google earth automatically.
I highly recommend it!
Cheers.
Gamblor.