The Tolkyn gas-condensate field is a deep pre-salt carbonate reservoir in the Precaspian Basin, onshore Kazakhstan. The field was discovered in 1992, but not developed at that time. In 2000, Ascom S.A. of Moldova (Tristan Oil & Gas) acquired the field and production began in 2003. Another Ascom subsidiary simultaneously developed the nearby Borankol field, with the two being exploited jointly. In 2008, a dispute began between the operator and the Kazakh authorities over various aspects of both the Tolkyn and Borankol contracts.