On 21 November 2018 Amerisur reported an agreement with Mecaya Oil and Gas and Petex Offshore to acquire 100% of the Mecaya Block in the Putumayo Basin. Mecaya will receive a cash payment of USD 400,000 for its 55% interest in the acreage and Petex will receive USD 150,000 for its 30% interest. When production commences on the block, Amerisur will pay USD 1.2 million from 50% of production to Mecaya, and USD 600,000 to Petex from 10% of Amerisur production. The company deal is subject to approval from the Agencia Nacional de Hidrocarburos (ANH). The Mecaya Block is adjacent to the PUT-9 Block and includes faulted zones with traps similar to those in the nearby Platanillo field.
Amerisur Resources (->100%) will acquire a 55% interest in onshore Mecaya block from local company Mecaya Oil & Gas, and a 30% interest from Petex Offshore.