I haven't even tried my crater buggy yet, just started about a week ago. Watched youtube vids about searching the alien sites with it but didn't even know it could mine hmmm.
A lot to learn in this game isn't there.
Just tried some mining and went to a station to sell what I had processed only to find I didn't know how to get it out of the ship, I went into panel 4 to the refinery and it had stuff in it so I went to the right of the line (Thinking it would put it cargo) but dumped it I guess IDK. haha sooner or later I'll figure this out.
SRV "mining" isn't like traditional space mining, it's basically "micro material gathering", often for elements. (Used for synthesis and engineering)
All you do is shoot rocks, or geological/biological thingies for materials to scoop up.
To get in the SRV (assuming you have one), land on any planet, and open the roles panel (the "down" panel), select your SRV, and deploy.
To get back in your ship, drive under the holographic square until the "board" light appears, then go to the roles panel again, and select "board" .
You can use the roles panel to dismiss and recall your ship too.