Endless copper mines and Quality mine shaft, do they stack?

[SicnarfNevarc]

Cannot find the answer to this so quick question.
Endless copper mines have to be placed on a copper deposit.
If you find that deposit with an upgraded Geologist and find a quality mine shaft (Half mining times 1:30 min instead of 3:00 min)
Does the endless copper mine, mine twice as fast endlessly?

[ABeaney]

yes

http://forum.thesettlersonline.com/threads/22769-Endless-Copper-Mine/page2