I've witnessed the following problem back in 6.3, and it seems still active in 6.42. There is a maximum range to where Mass Drivers work. When you open a colony around a second very distant star of a system for example (likely though a lagrange point), then mass drivers wont be able to carry any mining results back, forcing you to use costly freighters.
Looks like this:
![](http://abload.de/img/unbenanntiqo4l.jpg)
I calculated that one freighting trip of 20 holds currently costs me around 10kt Sorium, so exporting mining results would be 1t Sorium per 12.5t of mixed material.
![](http://abload.de/img/unbenannt2j4qqk.jpg)
The mineral packages just stay there forever now, and would just keep stacking up if I didn't cancel them being sent. If someone has an idea on how to clean them up, I want to know of course.(they might take calculation resources)