Okay so, the highest value (excluding mines of course) is sixty seven for big slime next to lich
Lich (11) + 2 big slimes (16) + 3 minotaurs (21) + mimic (10) + snake (6) = 67
Dragon (15) + 3 minotaurs (21) + 3 snakes (18) + mimic (10) = 64
3 big slime (24) + 3 minotaurs (21) + mimic (10) + snake (6) = 61
3 minotaurs (21) + mimic (10) + 4 snakes (24) = 55