I suspect it will be in the 250 range or so. That said, I also expect a change in the way we mine once they introduce refineries.
right now, we mine metals or other goods, and deal with “inert material”
I suspect we will end up mining ores (of various quality) that we can sell to refineries, who then sell or produce the metals.
the filter would then start functioning on ships like the prospector, filtering out the inert materials, and leaving only ores. It might even be able to filter out any low or medium grade ores, but I really doubt that,
those ores will then go to refineries, where based on the quality of the ore, a certain percentage of metal can be refined from that ore, for example, a high grade metal ore might yield 50 percent by SCU, while a low grade might top out at 10. If the refiner makes a mistake, they could lose some, or all of the production, with high cost ores being more difficult to refine,