Depends on the size of the area you're considering. In some area, one nuke would blow up 100% of the mines. But in some other, larger, area, it would only blow up 50%.
But to be fair, using nukes to clear mines is probably one of the least effective methods considering all the collateral damage on villages, fields and nature.
Thanks for linking to the wiki page. Now I know what I don't need to read since I also knew exactly what Web 3.0 was.