I like Brian's dot for the ivory, in fact it seems to me that's the best spot visible on the map at the moment. The one on the PH is low on both food and production in the long run by having no hills and less easily irrigable grassland, and it's one tile off a river to top it off.
Regarding the north, I think it's difficult to to decide until copper is revealed. That hilly ridge between the ivory and Monty looks attractive for a defensible frontier settlement, but we need to scout a bit more to the S of Monty's borders to see what's there. MM is too far away, unless bronze turns up near him I don't think it's worthwhile settling all the way up there for now.
The two hidden tiles near the dyes appear to be flatland jungle, it might be interesting to scout those for jungle resources as well.
If there is bronze to the W, I think the first city should go there. If bronze is elsewhere, either ivory first or that bronze spot if it's otherwise decent. I don't think we should consider the silver in the near future, the resource isn't worth wasting a settler on an otherwise rubbish site early on.