Amerisur Resources Plc operates as an independent exploration and production oil and gas company primarily in Paraguay and Colombia. It has a 100% working interest in the Platanillo block covering an area of 11,341 hectares in the Putumayo Basin, in the south of Colombia; 60% working interest in the Putumayo (Put)-12 block covering an area of 55,000 hectares adjacent to the Platanillo block; 50% working interest in Put-30 block covering an area of approximately 38,514 hectares located in the northern Putumayo basin; 30% working interest in the CPO-5 covering an area of 198,000 hectares located to the south of block Llanos 34 and to the east of the Corcel fields; 49.5% working interest in the Tacacho contract located in the Caguan-Putumayo basin; 50% working interest in Put-8 Block located adjacent to the west of Platanillo; a 100% working interest and operatorship in the Coati Block located to the South West of the Putumayo basin; and a 100% working interest in the Andaquies Block located to the north east of the Putumayo basin. The company also owns a 100% interest in five blocks comprising two exploration and production, and three prospecting permits covering an area of approximately 5.8 million hectares in Paraguay. Amerisur Resources Plc was incorporated in 2000 and is based in Cardiff, the United Kingdom.