Was it a Mourning Cloak?

Here is a link that might be useful: Insects of Alberta

Nice looking butterfly, but no, it looked more like a White Admiral. I'm not certain anymore. I had sunglasses on, come to think of it, so the coloring I thought I saw may have been a bit different. I should learn to keep a camera outside.

I'll have to keep my eyes open for it, in case it returns.

Thanks for the website :)