Is there another mining ship other than the Seeker? Anything in Beltstrike?
There is a 200dt one in the CT Aslan Alien Module that Belters can get (but since Belters are female and it takes a male to have the necessary Pilot skill to fly it, unless the owner has a kid brother or a nephew or a boyfriend/husband or something, she will look to hire a Spacer or Wanderer, I suppose).
It is basically a Far Trader with fewer staterooms (4 total) and no vehicles, allowing for a 74dt hold capacity, and because Aslan starships do not strictly
require a Medic, it can be routinely operated by a crew of two (a married couple or a pair of siblings, for example).
I should note that Beltstrike specifically mentions that pretty much
any spacecraft can be used for
prospecting if it has ~10dt free to carry supplies, samples, extra fuel, and so on. And
mining only requires the addition of a pulse laser mounted on a hardpoint somewhere for cutting up big chunks of ore, which are then further cut down by hand and stowed aboard the ship to be later sold unprocessed.
Processing equipment can eat up lots of dtonnage and energy and is probably not economical to do on-site with anything smaller than a mining platform.