the best ship for strip mining asteroids quicky is the Anaconda.... mainly because you can fit 6 Limpit Collectors giving you a total of 17 Collector Limpits.
My strip mining build below can strip out an asteroid in just 50 seconds and have all the pieces picked up, there is NO FUEL SCOOP, and it has an Engineered 2A Shielded FSD for the purposes of having good thermals to prevent overheating generated from using 5 Mining Lances (allows mining distance of 2km)..... mainly it cant JUMP, this is a Carrier ONLY deployable Strip miner.
A ship builder, outfitting and comparison tool for Elite Dangerous
s.orbis.zone
Now using the Mining Lance from that far away is not good and is much slower for your Limpits to travel to and fro thus taking longer to collect, how I use this Strip Mining build is ill start lasering it out at about 1.5km and move in at a safe distance at under 1km, this will prevent and of those double axis spinning asteroids from hitting your ship and mining at a very fast rate as the same as using Two 2D normal mining laser that have only a range of 500m