Huge number of mines swept in Norwegian areas in 1945

An item reported that in the Norwegian Oslo, Stavanger, Bergen, Trondheim and Tromso areas 711,000 mines were swept and destroyed which was just little over 50% of the total laid mines in these areas.

Source

The National Archives, Kew Gardens, England CAB-66-67-28 Weekly Résumé (No. 306) of the naval, military and air situation from 0700 5th July to 0700 12th July 1945.