On the tactical tab for planets (where you build defensive structures), the mines "to be built" are numbered on the minefield icon. However, once built, the "completed" number does not show up.
For example, when queueing Gauss Defense Platforms, the number left to be built is indicated on the lower right corner of the Gauss icon. The number finished is indicated on the upper right. Mines are missing the upper right "completed" count indicator.
Entrenchment 1.01.
