This is the 11830th most frequent Russian word.
заминировано
"Заминировано" means "mined" or "rigged with explosives."
The word 'заминировано' here is used as an adjective, derived from the verb 'заминировать', meaning that the place is equipped with mines.
Это место заминировано, сюда нельзя заходить.
This place is mined, you cannot go here.
In this case, 'заминирован' conveys the perfective state of being equipped with mines, focusing on the completed action of mining.
Сапёры сообщили, что мост заминирован, и его нужно разминировать.
The sappers reported that the bridge is mined, and it needs to be cleared.
Here, 'заминирована' is part of a passive construction, showing that the action of placing mines on the square has occurred.