I know Bob's Lake very well, FMan. Kingston is my hometown, and the hamburgers and I cottaged on Bob's Lake for 25+ years.
Rockhound central is just about an hour or so northwest of here.
Butter tarts
I picked some up to share with hamburger, in Athens on our way back down to the St. Lawrence this afternoon.
The route we took up toward the locks on the Rideau went past my favourite rockcut on the 401, where you can see a great dip of the Canadian Shield. Lotsa cool erratics used as driveway markers along some of the farm properties going north.
The backroad we took to get from Smiths Falls down to Athens went past quite a few active quarries.
A couple of hamburger's buddies were fairly serious rockhounds and had grinding and polishing equipment at home. I've seen quite a few nice tourmaline bolo ties in that crowd.