Here’s a good video that talks more about the power of the rich in SK: https://www.youtube.com/watch?v=iRgp8oBiAmw

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.