Drilling Commencement

Aminex PLC
11 May 2005


Aminex PLC


Drilling of Well GU#35 on South Weslaco Prospect, Hidalgo County, Texas, USA


Aminex PLC ("Aminex"), the oil and gas company listed in London and Dublin,
today  announces that its US operating subsidiary Aminex USA, Inc. has spudded
South Weslaco Well GU#35 in Hidalgo County, Texas.


The well is the first of up to four gas development wells planned for the
current year at South Weslaco.  Target depth is 9,000 feet (2,740 metres) in the
Frio Sands and there are prospective gas horizons in the range 7,000 feet to
9,000 feet (2,130 metres to 2,740 metres).  Partners are Aminex USA, Inc (25%),
Activa Resources LLC (25%) and Stalker Energy LP (50%) (operator).


Aminex Chief Executive, Brian Hall commented:


"GU#35 is part of an ongoing programme to build up new gas production by
drilling up proved undeveloped reserves in Texas to replace the production from
the ageing Vinton Field in Louisiana which was sold in late 2004.  The result of
the well should be known within one month".


                                                                     11 May 2005

Enquiries:

Aminex PLC
    Brian Hall                        [phone]
    Simon Butterfield

College Hill
    Jim Joseph                        [phone]






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