Perhaps you could SCRAP the mine field. I don't know if that will clear the avoid box, but at least you won't have to worry about the mines.
(When AI surrender to me, I often scrap or self-destruct the mine fields because they are annoying.)
Oh by the way, Do you know who Glen Campbell is?
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New Age Ship Yards
"We've made too many compromises already, too many retreats! They invade our space and we fall back -- they assimilate entire worlds and we fall back! Not again! The line must be drawn here -- this far, no further! And I will make them pay for what they've done!" -- Captain Picard STNG
Borg Breen Species 8472 Cardassian Dominion STNG Ferengi Klingon Romulan
Trek Movie era TOS Illuminati Starwolf