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The only problem I can see with DE is it does not get the queen, sooner or later it will rain and the DE will be washed away. And the ants will return. Keep using DE, or Sevin in the coops and run, but scalding and drowning works to get the queen, though it usually takes a few times as there are more than one queen.
Another method with the mound is to dig it up and put it in a 5 gallon bucket. Add dish soap, water and cover, the ants will drown. Be sure to do this with long pants, good shoes and socks and use bands around bottom of pants. Ants have no sense of humor.