Hi, I came here for ask what is the meaning of "ressource drain 30%" that is in the second image.

Its a Space Age mechanic that means it drains less ore from the patch for every actual output cycle.

• 100% means every 1 ore in the output costs 1 ore from the patch. This is normal.
• 50% means every 2 ore in the output only cost 1 ore from the patch.
• 30% would be 3.33 output ore only cost 1 from the patch.

Coupled with Mining productivity research, this gets powerful very, very quickly.

Just to make you understand more the difference:

• Adding a productivity module 3 to a machine makes you obtain a 10% boost, so you obtain 1.10x times the ores mined.
• Adding the same module to a big mining drill, that has a 50% resource drain, makes you obtain 1.10x times the ores mined, but you consume half of them.

So the amount you extract depends on mining speed, but the amount you consume depends on an additional multiplier: you consume half of the 1/1.10 you would normally consume. Now try to add as Meddleman said productivity bonuses and you'll see how crazy this can get.
_77

ok, I understand now, thx a lot ^^.

U're welcome mate. :D