I took a moose off Mica Peak a few years ago. Here's what I remember.
1) Lot's of deer, turkey, and moose. Said to be elk, but I never saw one.
2) Inland Empire owns most of it, they require a permit to use their land.
3) It's gated off but motorcycles, ATV's, bicycles, horses, are allowed.
4) There is state land to camp on there by the main WA access.
This is all subject to your own verification.
Good luck.