Oil on Engine Mount Bolt

[RodKnock]

So I needed to replace my alternator (good luck to anyone who gets the pleasure of trying to find one) and when I removed the passenger engine mount to get at the serpentine belt, one bolt had a coating of oil on just the last few threads. It was only at the tip, no signs of oil seeping INTO the hole. So does this mean my block is cracked? I can't find any oil anywhere else. I at first thought maybe the bolt goes through an oil gallery, but looking at other diys everyone else was taking out clean bolts.

 

[Chuzz']

Could it be just a slight leak from the valve cover? IDK, just asking. Check the bolts and make sure they're snug.