I'm curious if you are talking about Gothics as a summer or winter climb. The north face is a very popular winter climb, but I heard that it never came in this year. I'm not familiar with any rock climbing on that slide. If it's been done before it will be in the guide book. Big slide mt. and the trap dyke are popular back country slides. I don't really have any beta, because I don't like that type of climbing. If you want info on the established crags, I can help there, because I know most quite well.
Kevin