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29th May 2009 

Amerisur Resources Plc ('the Company')

Paraguay - Operational Update

Amerisur Resources Plc, the oil and gas explorer and developer focused on South America, is pleased to give the following update on technical work performed in its Paraguayan properties.

The surface geochemical sampling programme in the San Pedro contract has been successfully completed on time and within budget. The samples are currently being analysed at the laboratory of the specialist consultant in Bogota.

The samples were acquired in the form of two separate grids located over distinct leads identified through reprocessed and re-interpreted 2D seismic data. The northern grid measured two by 19 km and the southern, five by 19 km. All samples were acquired at the points required by the grid, and the condition of the samples was described as excellent by the acquisition contractor, who considers them suitable for analysis.

Initial results will be available during early June and final analysis will be completed during July 2009.

Giles Clarke, Chairman commented:

'I am pleased that we have completed this programme within our timeframe and budget. As we have mentioned before, our Paraguay blocks are very large and hold considerable potential. We look forward to the results of this study, which we feel will further enhance the prospectivity and value of our blocks. We continue discussions with potential partners regarding farm outs in both our Paraguayan blocks and I look forward to updating shareholders as progress continues.'

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Competent person: Technical information in this announcement has been reviewed by John Wardle Ph.D., the Company's Chief Executive. John Wardle has 24 years experience in the industry, having worked for BP, Britoil, Emerald Energy and Pebercan, and is a trained drilling engineer.

ENQUIRIES:

Billy Clegg/Caroline Stewart,  Financial Dynamics	Tel: +44 (0)207 831 3113
Jerry Keen/Andrew Raca, Blue Oar Securities Plc	Tel: +44 (0)20 7448 4400

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