4 December 2017

Amerisur Resources Plc ("Amerisur" or the "Company")

Monthly Production, OBA Throughput and Operational Update

Amerisur Resources Plc, the oil and gas producer and explorer focused on South America, is pleased to provide unaudited production from the Company's two producing fields, the Platanillo Field, and the Mariposa-1 Long Term Test (LTT), and provide OBA throughput data for the month of November 2017 (the "Period").  Mariposa-1 commenced production on 17 November 2017, with stable production post a Pressure Build Up Test commencing 24 November 2017.

Production 

·     Total production was 181,537 barrels of oil ("BO") during the Period.

·     Average production per calendar day was 6,051 barrels of oil per day ("bopd") during the Period.

·     Average production per operational day was 7,037 bopd since the initiation of the Mariposa-1 LTT.

·     Peak daily production was 7,217 bopd during the Period.

·     Mariposa-1 LTT production has increased from a controlled rate of 1,487 bopd to a controlled rate of approximately 3,100 bopd.

·     Company expects further increases in production from Mariposa-1 LTT.

·     Current Amerisur production before royalties is approximately 7,051 bopd.

OBA Export

·     Total export volume was 173,055 BO during the Period.

·     Average throughput per calendar day was 5,768 BO during the Period.

·     Average throughput per operational day was 6,310 BO.

·     Peak daily throughput was 7,066 BO during the Period.

The company is expecting a sustainable year end exit rate of production in excess of 7,000 bopd and average production for 2017 of slightly below 5,000 bopd on a calendar day basis due to peace process related social issues, and above 5,000 bopd on an operational basis.

Platanillo-25 has been produced at a controlled rate since early November and has stabilised at 180 bopd with low water cut.

John Wardle, CEO commented:

"I am pleased current production is over 7,000 bopd.  Platanillo production was affected due to a short period of regional social issues in the early part of November which have now been resolved by central Government. Platanillo-27 on Pad 2N is drilling ahead on time and budget and we expect results from this well in December. I was pleased to report the commencement of the Mariposa-1 LTT, which is adding further material production to Amerisur, with, we believe, more to come from this well as the LTT process develops."

These data will vary month on month as development, appraisal and exploration operations continue, and also due to the factors involved in operating in the Putumayo region of Colombia.  These factors include inclement weather, social issues with drilling and oil transportation and planned and unplanned shut downs for technical works undertaken among others.  The data has not yet been approved by the Colombian Agencia Nacional de Hidrocarburos (ANH) or national customs and tax authorities DIAN and may be subject to revision.

ENDS

Enquiries:

Notes to editors

Amerisur Resources is an independent full-cycle oil and gas company focused on South America, with assets in Colombia and Paraguay and production from two fields in Colombia. In 2016 Amerisur successfully built and is 100% owner of the strategic OBA oil transfer line into Ecuador.

In Colombia, the Company is operator and has a 100% working interest in the Platanillo block which includes the Platanillo producing field in the Putumayo basin, and holds a 30% non-operated working interest in the CPO-5 block containing the Mariposa-1 producing field in the Llanos basin. Amerisur is currently producing in excess of 7,000 bopd.

Amerisur has a strong position in the Putumayo basin and has a cluster of near term activity assets around the OBA export line.

This announcement contains inside information as defined in EU Regulation No. 596/2014 and is in accordance with the Company's obligations under Article 17 of that Regulation.

www.amerisurresources.com