Cutter is a good choice, if a bit on the expensive side to use (or lose) for mining, I used a Corvette. Think Limpet Controllers. A single (large) PROSPECTOR Limpet Controller capable of running at least 2 limpets simultaneously and two (2) COLLECTOR Limpet Controllers. Also, fit two (2) yes, I said 2 mining lasers, two to start breaking off a lot of chunks initially which gets all 12 collector limpets working, then just one to sustain the rate, to keep them all working while not breaking off more than you can collect before it floats away and a large refinery. Aside from that, before leaving port DO NOT FORGET to FILL THE HOLD with limpets. It is better to have to throw a few limpets over the side to make room for more ores rather than having to make a trip to buy more limpets.
Point your ship at a rock, switch to prospector limpet controller and fire off a prospector limpet (#1). When it attaches to a rock it transmits the composition of the rock to your ship but do not wait for that, point the ship at another rock and fire off another prospector limpet (#2). Switch targeting back to limpet #1. If there is Painite there, mine it! DO NOT target the ores, target the prospector limpet, switch to the collector limpet controller and release 6 limpets, then switch to the other collector limpet controller and release 6 more and start breaking off chunks. If the rock limpet #1 is attached to shows no Painite, point the ship at another rock, fire off another prospector limpet (#3, #1 will expire) and switch targeting back to limpet #2 to check the composition of the rock it is attached to. Rinse & repeat, always keeping 2 prospector limpets working. Firing a third prospector limpet always "expires" the first so you will get "limpet expired" warnings.
Prospector Limpet Controllers have the added benefit of DOUBLING THE ORE YIELD OF ANY ROCK THEY ARE ATTACHED TO! It will be necessary to continually monitor the refinery to prevent refining and filling your cargo hold with ores you do not need. A note: Do not carry any cargo into a mining area. MATs are OK but no cargo. Also, do not carry any refined ores from one mining area to another in order to continue mining. Always dispose of (sell, donate, etc.) your ores before continuing to another mining area. The reason for this is the NPC pirates that will slide up a minute or so after you enter a mining area and ask you about your cargo. If you have any cargo or refined ores they will try and take it, if you have none they will leave. In my Corvette Betty they usually slide up, mumble something about mistaken identity and leave . . . o7
PS: A good way to attract pirates and collect bounties is go to a mining area with a little bit of cargo in your holds. The pirates will come to YOU . . .