[LintMan]

Originally posted by Norfleet:
If you were playing a rich world, you may have received a random gold mine as a lucky random event: Ermor tends to have luck, and you probably did also. That would explain the province income, as Ermor's home province does not naturally receive income.

Actually, in that test game, the scales were +3 order, -3 luck, with the game set to rare events. For sure there was no gold/silver mine in the province.

I created another new game to test things further, and there was no bonus income this time, until some lucky event "permanently increased gold revenue by 50". It wasn't a gold mine though - maybe a "trade guild" or something, and no site icon or any other indicator appeared. (When you get a gold mine event, a gold mine site icon shows up). Perhaps something like this even had happened in my original game and I just missed the message. (Given the misfortune-3 scale and rare events setting this seems unlikely, but is still the best explanation).