Shaft mines make people unhappy. They upgrade from normal mines.
my problem with unhappiness/unhealthiness form improvements is somewhat invisible. if you are not familiar with this you will realize it far too late. and even if you are it easily slips from your mind. so should improvements show health & happiness directly on the worked tile? i think yes.
btw. do the unhappiness only apply when the improvements are worked?
Yes, it's pretty much a downgrade. A downgrade you can cope with by pillaging it whenever it pops up, the AI of course is not that smart - improvements that grow are supposed to get better over time, not worse, after all.
it depends. i get most of my production in the early game from mines and there is not much of an alternative. so it mines are more complicated to deal with right now - but still worth it.
as for the AI it has still the problem that its cities are miraculously very small (i bet it's slavery civic) and it builds much more mines that it can work - crippling itself sometimes.
I just removed the shaft mine unhappiness, I don't think it really gives anything positive to the game to have them create unhappiness.
Tell me where and how I needz tis!!!
RoM/Assets/XML/Terrain and find the file ImprovementInfos.xml (don't have it in front of me so you need to figure out what I'm talking about ). Go to Shaft Mine entry. Go down to the entry until you get to where happiness or unhappiness is, and change it.
Again, not in front of me so don't follow so exactly but use your judgment since you seem somewhat experienced with xml editing .
why unhappiness from shaft mines anyway? i could understand pollution being generated from it.