Mini raises is an enigma especially in low buy-in tourneys. Either they would like to see a cheap flop with medium pairs or trapping with monsters. You described your opponent as passive. He mini-raised, called, then check-raised all in on a coordinated board? Can't totally discount AQ or QQ here or even AA. I know, I know. TPTK is too tempting here with your above average stack early in the tourney. Even if you lose you're still ok.

Tough. I close my eyes and click CALL.

How did you do?