Plant Forest question

[Jagon]

Mousing over the Plant Forest icon on the former indicates 1 food 1 mineral. If we have a farm on grassland, tropical or savannah, does Plant Forest add 1 food 1 mineral to the yield already on the tile without replacing anything else? If so, does that add the same way to hills with tropical or savannah and a mine? Thanks for answer, I couldn't find otherwise.

[Veneke]

I found this a little awkwardly explained as well. It seems to be though that farms and mines stack with whatever terrain is underneath (so a farm gives +1 food to the tile, a mine +1 minerals) but planting forests effectively creates a whole new tile. The 1 food 1 mineral is an indication of what you'll yield from the tile after the process is complete.

[solestus]

It don't matter whats under the forest will always give +1food/+1mineral/-1pollution(Edit**On hills you get 1/2/-1) personaly I don't really use forests unless I'm desperate for Minerals or until late game when i use them to offset the pollution(and thus morale problems that causes) from Fungus tiles, would be cool if they did augment the base tile tho or got some boosts from tech as they did in . SMAC .