That is some steep, steep rugged country. The meat should be just fine if you can hang it in the shade. It will get cool enough at night that if left in the shade during the day, you will be fine. I would suggest finding someone who can get horses in there to help you if it gets too bad. Don't mess with it, just bone it out to begin with, then have the phone number handy to the packer if you get in over your head.