I have a mining ship when I'm in a sector and control a gun ship/salvage setup. I protect the miner and salvage any wrecks as I go.
In a good Trinium sector with 4 trinium mining lasers and 4 naonite ones I can grab about 20k in 10minutes including the stuff I salvage off ships.
The same works in lower end sectors but I have more efficient mining and salvage lasers now.
Its a bit of a pain to get your AI ship to do over 300m/s when it follows you out the sector, and you have to be within 5k ish of it when you jump for it follow you. Also note the jump ranges on both ships.
Basically its well worth the hassle setting it up. Biggest tip is make sure you have a load of spare crew on board your ship BEFORE you build it, or be near a station with crew. Also make sure you have a commander available on your ship to transfer or at a nearby station.