Mine deployment device

Anybody know if these work?

I built a couple assuming that I would fly them somewhere and deploy mines. I flew them where I wanted but no button or anything giving a clue on how to deploy.

Any help here would be appreciated.

Lee stated that they are basically converted to an immobile minefield wherever you want them to be placed. He did not,however, describe how that function is performed. There's no button for the conversion when you're in your planet's orbit?

There should be a button to the right of the 'form fleet' button that looks like a mine with a down arrow when you select the ship. I just deployed one at one of my planets to double check and it's working on my devices.