Never, ever, refine anything other than ice at a POS. Your yield is capped at 75% or some stupid low number. For a solo miner, a POS would only provide storage of ore without the dock/undock cycle, or allow you to transfer to a freighter for hauling. IMO, not really worth it, but not a huge waste if you use a small POS. This is assuming that there is a station where you mine. If the system is empty, then a POS makes getting the Ore somewhere safe much faster.

- Souca -