I need to have a trigger to remove whatever unit is created when a worker mines at a mineral field. I have created 2 triggers with conditions of "bring Mineral Chunk Type A/B" which should remove the mineral chunk and order the worker to stop moving. These triggers aren't firing though, I've tried all players, neutral players, player 7 (who owns the mineral fields), neutral to no avail.

I need this to prevent exploiting where workers can walk through ground units while carrying cargo.
Thanks in advance for the help

the image a worker receives when mining a mineral field is not a unit, but an image. The only way to remove it is to remove the worker and make a new one, or let the worker return the minerals back to the town hall. There is no way to stop workers from walking through units while carrying cargo.

Oh, lame
Thanks for the speedy reply, I guess I will have to come up with a different, less direct, workaround.