Well, I dont have an X-Box (but I'm still a HUGE oddworld fan) and from what I've heard, you can pick up Muds and throw 'em over mines (cos they cant dodge them on their own) so maybe you can pick up munch and give him a good chuck?
If you're refering to the bit with the pond, then simple. Once Munch is there, carefully have him in the water jumping over and around the mines. I can't think of any other place where you need to get Munch over mines.