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.