Aha - maybe, just maybe I've seen that one before. Lets see..... There's a climbers route between Lake Louise and Lake O'Hara (there's a hut just on the Yoho side, that you can rent from the Alpine Club). Abbott Pass. But no 'B' aruond there that I recall. Dang.... Doesn't quite look like the Eiffel route into Kaufmann creek either. There's a Bowlen peak route just south of Morraine....
NO - WAIT. That is Mount Ball, near Shadow Lake, yes? That is my final answer.