"Costean" actually refers to a form of searching for mineral deposits, aka "mining", which may be where you got the reference to "mind searching" instead of "mine searching."
As it stands, though, it doesn't seem to have much in the way of references, and the search traffic is negligible at best.
Trying to evaluate a domain's value based on the number of search results is foolish, since plenty of words come up in search results that would make no sense if you put them in a domain name. You're better off thinking only about the number of actual exact-keyword searches done per month, which as I mentioned was extremely small.
You may be able to find the right end-user for this one, but I'm incredibly pessimistic about this. I'm going to have to say this one is reg fee.