Just cos you can't harpoon a mine doesn't mean that you can't drag someone through them...
Listen Cul, which sounds cooler. Dragging a guy kicking and screaming into a mine, or whirling a mine around your ship like some kind of nunchuk, and finally throwing it at the enemy, devastating their hull armor, and then pounding them with a flak?
That said, I don't think my harpoon mine meta is going to take off. Oh well, it still has potential.