I'm in favor of a city site A. It increases the number of forests available and only sacrifices a single floodplain that wouldn't be worked for quite a while anyway.
Also, it looks like we may need a little bit of farming early to benefit from both gold mines. I don't normally condone it, but since we're lacking a large food resource, I'd say farm a floodplain or two. Maybe a research path that looks like Agriculture, Bronze, then Pottery (mostly for the granary). This would be followed up by either Animal Husbandry or Hunting and Archery. I'd lead with a worker first (to build a farm then start on the gold mines), followed by a couple warriors while growing the population, then (when available) a granary. If we could steal a second worker that'd be great. Otherwise, we should probably chop/pop rush one after the granary. Then, get started on expansion (military or non-military).
Short term goals are to get both gold mines up and running and have a large (~4) food surplus available for whipping. I envision something involving a farm and a couple cottages on the floodplains. You work those tiles (and maybe a grassland cottage) when growing your population quickly after whipping. Then, when you've capped out your population, switch over to the gold mines. You'd probably only be whipping 1 pop at a time in the early game, as you'd like to spend as much time as possible working the gold mines.
Also, it looks like we may need a little bit of farming early to benefit from both gold mines. I don't normally condone it, but since we're lacking a large food resource, I'd say farm a floodplain or two. Maybe a research path that looks like Agriculture, Bronze, then Pottery (mostly for the granary). This would be followed up by either Animal Husbandry or Hunting and Archery. I'd lead with a worker first (to build a farm then start on the gold mines), followed by a couple warriors while growing the population, then (when available) a granary. If we could steal a second worker that'd be great. Otherwise, we should probably chop/pop rush one after the granary. Then, get started on expansion (military or non-military).
Short term goals are to get both gold mines up and running and have a large (~4) food surplus available for whipping. I envision something involving a farm and a couple cottages on the floodplains. You work those tiles (and maybe a grassland cottage) when growing your population quickly after whipping. Then, when you've capped out your population, switch over to the gold mines. You'd probably only be whipping 1 pop at a time in the early game, as you'd like to spend as much time as possible working the gold mines.
I think city A is the better start and then place city C 1SW to have the fish, some flood plain tiles and maybe some more on the west and most importantly no overlap with A. Almost perfect dotmapping.

If you had settled in place with your first city you probably could've had the sheep and copper together in a city. Hindsight is 20/20 but I usually prefer settling in place unless 2 tiles from the coast. 

