In other words, they are too concentrated on doing their work than coming with you. Once they finish their work though (Working -> Idle) then they will follow you around if you ask them to.
But forcing people to interrupt their work just to follow you around won't do and just make the builders think badly of you. Just wait until they are done.
And this special NPC type 'Dirthauler' can just be set to idle when you are in the Command Room of the same mine he is in.
In the 'Facility Management' screen push --> ACTION --> MINING/FARM --> ADD NPC
Then use the checkboxes to change the status of your NPC.
edit:
I have not tried that yet, but since the NPC must be owned by the mining faction, it might be possible to make them over to someone else. Accordingly to the RULES they probably quit working then.
Edited By: Vip Fortuna on Year 9 Day 81 1:53 ____________