The cloak detector can scan areas that have been mined.
You can also periodically see mines emit a detection ping.
If a mine detects a hostile target within its ping range, it will try to attach itself to the target and explode. Mines are never solitary and come in large groups maintained by a near bye mine generator. If the mine generator is destroyed, the mine field will collapse. Both mines and generators are cloaked, but the basic cloak detector will only detect generators.