Okay to re-freeze half thawed burger and venison?!?

I just went to get a roast out of my deep freezer, which we keep in our entry way. Well, I noticed it's not working and my meat is half thawed! There's about 50 lbs of beef in there and about 20 lbs of venison! The big things like steak and roasts are still frozen, but the venison burger we made ourselves is just in freezer bags and it thawed out. It's still cold in there, so it's like the meat has been in the fridge, is it okay to re-freeze that meat or should we just toss it?