Originally Posted by ravenfeeder
The income on the cards doesn't match the actual income. A small mine gives you 300 per small vein and 600 per large vein. A mining centre gives you 750 for a small vein and 1500 for a large vein. Govenors can increase this by up to 50% with the right traits and ancillaries.
They did give more in 0.80, but certain factions like the Baktrians were too powerful with those numbers.
Certain provinces have multiple mine resources and give better incomes. The best settlements are Pella (three large veins, that's 4500 with a mining centre) and Dalmion (2 large and one small vein).