Mingir, 30, finished 27th in the women's steeplechase eight years ago, but has had that result scrapped.
"Re-analysis of Mingir's samples from London 2012 resulted in a positive test for the prohibited substance dehydrochlormethyltestosterone (turabinol)," the IOC said in a statement.
Mingir won the gold medal in the event at the 2012 European Championships in Helsinki. (AFP) APAAPA