Texas Gas Discovery

Aminex PLC 01 June 2005 Aminex PLC Texas Gas Discovery Aminex PLC ("Aminex"), the oil and gas company listed in London and Dublin, today announces that its GU#35 well in the South Weslaco field, Hidalgo County, Texas, has reached target depth and has been declared a commercial gas discovery. The well will be completed for production when equipment is available, probably at the end of June. Detailed well results will be released in due course, subject to partner approval. Partners are Aminex USA, Inc (25%), Activa Resources LLC (25%) and Stalker Energy LP (50%) (operator). Aminex Chief Executive, Brian Hall commented: "This successful well is the first in a series of gas development wells planned on our US properties for 2005 aimed at boosting production and accelerating revenues." 1 June 2005 Enquiries: Aminex PLC Brian Hall +44 (0) 20 7240 1600 College Hill Jim Joseph +44 (0) 20 7457 2020 This information is provided by RNS The company news service from the London Stock Exchange