Check the number of outposts. I can guarantee you have less.
Your mines produce based on the number of outposts each person has. 1 np/day per outpost you own. That gives a total no/day, and then the mines just produce at regular intervals to reach that daily quota. Quick number guessing here, you've got somewhere around 6-8 outpost and he's got about 18-20?
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P.S. Those are actually 3 different links!