VERY IMPORTANT about Space Miners.
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GalCiv2 Forums
Here is the thing. Space miners are REUSABLE. Once they have upgraded the asteroid, you can click on them (they are on the asteroid) and then move them anywhere you want. (like the next asteroid). Once you move thenm, you can then click the asteroid and assign its production to any planet you own.
Note also that the farther you go for the asteroid the less production you get.
here are some pics to explain he concept.
Note also that the farther you go for the asteroid the less production you get.
here are some pics to explain he concept.

