Is spain the richest province?

[athanaric]

Spain is one of the richest provinces seeing that every region, IIRC, has a mine in it.

Four actually don't. Edetania, Celtiberia, Lacetania, and Bastetania don't have mines. Most of them have large ports though.
The richest province in Spain though is Turdetania with Gader as capital. Two mines plus a level 2 port plus an obscene amount of trade resources. Turdulia and Carpetania come close with two mines each as well. Carpetania is landlocked though and Turdulia only supports a level 1 port.

Further east, Makedonia and Dalmatia are blessed with three mines each, being the only provinces with that feature.
Sind is very neat as well with two mines, a level 2 port, and numerous trade resources. Oh and awesome units if you play the right factions.