I've probably missed something in your text but why did you mine the hill with the pigs resoure? 
If you really wanted a mined hill ASAP you could've picked the one south of it. Better still: you could've worked the pigs AND the plains hill by the river, which yields the same amount of food, more hammers AND one additional gold.

If you really wanted a mined hill ASAP you could've picked the one south of it. Better still: you could've worked the pigs AND the plains hill by the river, which yields the same amount of food, more hammers AND one additional gold.