Gran Tierra Energy Inc. announced it has agreed to acquire the remaining 50% stake in the Putumayo-7 exploration block, located in Colombia, from UK peer PetroGranada Ltd. for USD 19 million (EUR 17.4 million). As part of the agreement, Gran Tierra is required to pay an additional USD 4 million if the production of the Putumayo-7 block meets or exceeds 8 million barrels (MMbbls), including gross proved and probable reserves.