strange pics!
are you alone on this continent?
disclaimer : carl corey is right! building a settler at size 1, with so many good tiles is nuts.
however, you asked so i answer.
Since you already have copper in your capital's fat cross, you can settle a good second city without too much thinking about war ressources.
SO :
1) Don't go too far, you need to defend those cities, and to build roads between them.
2) look for food and commerce. Capital is production house for sometime, with copper and gold mine.
3) you're financial so river tiles are good for cottages
I see north of your capital a good spot, on the same river
(so direct unpillageable trade route to your capital

) with another gold mine and rice + flood plains : one tile east of the gold mine. It has some overlapping with the capital, but that is not a big deal.
dotmap for this commerce city (4 FP and 5 forests = good health and high food

)