The development stages:Exploration drilling/2013-01.The Bretaña field is operated by Gran Tierra Energy and is located at the block 95, in the Marañon basin. It contains 2P reserves of 61.5 million barrels of oil and 3P reserves of 114 million barrels of oil. The company is planning to start long-term test production from the field in September 2014 at a gross rate of approximately 2,500b/d, with an appraisal well planned to be drilled in the fourth quarter of this year in the southern portion of the Bretaña field. The second production phase is expected to begin in 2017 at approximately 6,000 barrels of oil per day gross. The preliminary Bretaña full field development plan contemplates US$1.197bn in future capital spending, covering 2P reserves over the next 11 years. Full production is expected to be initiated in 2021 at between 20,000 to 40,000 barrels of oil per day gross, depending on ultimate definition of recoverable reserves size and reservoir performance characteristics.