[Alneyan]

*Slaps self* I see your meaning, but my attempt at a formula is very, very wrong. I wrote that Happiness/Population/Racial multiplied in the formula, when they actually add. So the proper formula is as follow:

(Extraction Facility value) x (planet’s resource type %) x [(empire’s racial %) + (planet’s happiness %) + (population %)] = total mineral resources committed to your empire for that facility.

If you hate maths as much as I do, here is the explanation:
1) Multiply your basic extraction value with the planetary value. This will be your basic production for this facility on this planet.
2) Add in the bonuses based on your Empire and your planet. These are population, happiness and racial characteristics.
3) Multiply the result obtained in 1) with the result obtained in 2). This gives the final production of this facility on this planet.
4) According to Fyron, the planetary/system facilities increasing resource output multiply with each other, and multiply with the result in 3).

Thanks Makinus for having made read my formula again! There was indeed quite a problem here.