AMER.L Regulatory News (AMER)

19th December 2011

Amerisur Resources PLC

("Amerisur" or the "Company")

Paraguay Update

Amerisur Resources, the oil and gas producer and explorer focused on South America, is pleased to announce that it has made 3 new applications for Prospection Permits within the Piriti and Pilar sedimentary basins in Paraguay. These areas have been defined on the basis of new analysis which was prompted and supported by the positive results seen in the San Pedro Aeromagnetic and Gravity studies. The three applications, named Espartillar, Las Palmas and Coronillo, have extensions of 2,400,000, 2,400,000 and 402,000 hectares respectively. The applications are currently under review by the Paraguayan authorities, and the Company hopes for a positive determination during January 2012.

In the San Pedro block, in preparation for seismic acquisition during 2012, the Company plans to acquire a seismic test line in the early part of 2012. These operations will trial various types and configurations of energy source and receiver array to determine optimum characteristics.

John Wardle, Chief Executive commented:

"Our recent work in mapping the fundamental geological structure of the majority of the Republic of Paraguay has led us to identify important potential in the areas we have applied for. Given a positive response from the government of Paraguay we plan to begin prospection work in these new areas during Q2 of 2012. We are very pleased with the progress in Paraguay, and the acquisition of the test line will provide key information on optimal acquisition parameters, allowing us to perform optimised exploration over our very large acreage position."

Giles Clarke, Chairman commented:

"We look forward to increasing our presence in Paraguay and to continuing our exciting exploration campaign there."

-Ends-

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Notes to editors

The latest concession map published by the government of Paraguay can be viewed at:

http://www.ssme.gov.py/vmme/images/CatastroHidrocarburo/catastrohidroc15-12-2011.pdf