A very strong reading of the "gain information about the target" could apply to using Light and regular vision. That seems silly. I think it's pretty clear that this should protect from effects that mimic mind reading or other divination, but wouldn't block a bat's sonar. If the creature in question has the ability to locate you in the dark by feeling your thoughts, it'd work. If it can locate you because it can feel vibrations or hear your exact location or even has magical eyes that work by something other than perceiving your mind, no.

A very strong reading of the phrase "gain information about the target" could apply to using Light and regular vision. That seems silly. 

I think it's pretty clear that this should protect from effects that mimic mind reading or other divination, but wouldn't block (for example) a bat's sonar. 

If the monster in question has the ability to locate you in the dark by feeling your thoughts, Mind Blank would keep you safe. But if it can locate you because it can feel vibrations or hear your exact location or even has magical eyes that work by something other than perceiving your mind, no.