[Phoenix-D]

"So if you had two asteroid Groups, two ships with two remote miners each= 4 mining production of resource."

I think it's per sector, per resource. And I KNOW you can put more than one component on a ship and have it work.

So:
Three space stations in one sector each with 3 miners of a single type (one station all mineral, another all organic, another rads) would work fully.
Three space stations in one sector, each with one of each type (1 organic, 1 min, 1 rad per station) would NOT work. Only one ship would mine.