TORONTO, ONTARIO--(CCNMatthews - Feb. 23, 2006) - Guyana Goldfields Inc. (TSX:GUY) announces the result of metallurgical testing conducted on samples from its Aurora Gold project, located in Guyana, South America. The testing was conducted by SGS Lakefield Research Laboratory of Lakefield, Ontario under the supervision of Mr. Les Heymann, P.Eng., metallurgical consultant to Guyana Goldfields Inc.

Six composite 5-kg samples, each representing different "field- classified" types of mineralization were collected from coarse drill core rejects representing 15 holes located in 3 different zones of the Property. From these 5-kg samples, the laboratory took a 1-kg portion for Carbon in Leach Bottle Roll testing. The testing was done in triplicates.

The objective of the test is to determine if the gold from each of the zones on the Property can be leached using conventional cyanidation conditions.

Salient test results are tabulated below: (a)

---------------------------------------------------------------------
---------------------------------------------------------------------
Sample       Head Assay       Consumption       Gold         Comments
Number          g/t               kg/t      Recovery
        ---------------------------------          %
        Assayed  Calculated   NaCN    CaO
---------------------------------------------------------------------
---------------------------------------------------------------------
G05121     2.02        3.71   0.46   0.40       94.9    Rory's Knoll-
                                                              Primary
                                                      mineralization/
                                                           High grade
                                                         disseminated
                                                     type in Tonalite
---------------------------------------------------------------------
G05122     2.24        2.38   0.57   0.36       91.9    Rory's knoll-
                                                              Primary
                                                      mineralization/
                                                          Lower grade
                                                         disseminated
                                                     type in Tonalite
---------------------------------------------------------------------
G05123     8.55        8.56   0.65   0.48       91.4      Aleck Hill-
                                                              Primary
                                                      mineralization/
                                                         Structurally
                                                      controlled vein
                                                                 type
---------------------------------------------------------------------
G05124     3.50        3.78   0.45   2.96       97.4      Aleck Hill-
                                                            Saprolite
                                                             Oxidized
                                                            material.
                                                         Lower grade.
---------------------------------------------------------------------
G05125     7.94        8.15   0.44   1.44       97.9      Aleck Hill-
                                                            Saprolite
                                                             Oxidized
                                                            material.
                                                        Higher grade.
---------------------------------------------------------------------
G05126    21.75       16.16   0.59   0.36       97.6       Madd Kiss-
                                                              Primary
                                                       mineralization
                                                            in felsic
                                                       porphyry dyke.
---------------------------------------------------------------------
---------------------------------------------------------------------

(a) The more detailed test report by Mr. Les Heymann is available in the Guyana Goldfields website (http://www.guygold.com/Aurora.php).

There was close agreement between the triplicate test runs. In most cases the cyanide stopped being consumed after about 6 hours, indicating a relatively short leach time.

The assayed and calculated head values are in many cases in close agreement indicating that test was well done. In the cases of G05121 and G5126, the disparity between the two values are attributed to "nugget effect" often found in gold deposits.

Cyanide and lime consumptions are in normal range.

Mr. Heymann concludes that the material tested "appears not to be refractory and might be expected to yield 92% recoveries under very normal cyanide leach conditions."

Further metallurgical testing will be done in the future as exploration and development work progresses on the Aurora Gold project.

About Guyana Goldfields

Guyana Goldfields Inc. is a Canadian based mineral exploration Company primarily focused on the exploration and development of gold deposits in the Guiana Shield of South America. The Guiana Shield is in the northern part of the Amazon Craton and covers parts of Guyana, Venezuela, Suriname, French Guyana and northern Brazil.

The Company holds advanced exploration projects in various stages of development and has been operating in Guyana continuously since 1996.

The Company currently has approximately (CDN) $8.0 million in cash and no debt.

Additional Information

Information is available on the Company's website at www.guygold.com and on www.sedar.com and through the Company's offices at:

141 Adelaide Street West,
Suite 301
Toronto, ON
M5H 3L5

The TSX has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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