I was looking into this a bit at the end of last summer. That and what is call rock hounding, which is searching for gems and minerals. I was unable to find any quality forums and also ran into the no one talks dilemma. Even asked at a few gem selling and supply stores where a newbie could start and got the answer, "I don't know of anywhere." Bullshit.
Basically you have to learn you some geology and a map to look for areas that may be worth your while. There are some gem/gold clubs as well, I am sure you could probably find one in BC. There are also definitely some cheesey tourist attractions where you might stand a chance, but those aren't "spend your day by the river peacefully" kind of places.