Gran Tierra Energy Inc. declared its financial and operating results for the quarter ended June 30, 2012, in addition to an independent mid-year reserve update for the company's largest asset, the Costayaco Field in Colombia.

"Gran Tierra Energy's 2012 oil reserve growth initiatives are off to a very strong start, with new oil reserves discovered with the Ramiriqui-1 new field discovery, substantial reserves added due to continued superior reservoir management and performance in the Costayaco Field, and additional reserve potential identified in the Moqueta Field, all in Colombia" said Dana Coffield, President and Chief Executive Officer of Gran Tierra Energy.

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