I made a small ore drill refiner and flew it to dress and eelo. I found out that you need to exceed a certain ore concentration in order to make the small drill work. This minimum concentration does not seem to correlate with the overlay cut-off concentration which is shown in the map view . This makes finding a proper refuel landing spot rather difficult.
Seeing that the large drill weighs the same as the small one, but doesn't have the limitations of the smaller one, i wonder if anybody uses the small drill at all?