Gold Resource Estimated for Igor



    CALGARY, Feb. 13 /CNW/ - Sienna Gold Inc. (SGP.V TSX Venture Exchange)
announces the results of its resource estimation for the Domo and Tesoros
mineralized zones at the Igor prospect. The basis for the estimate are the
9 holes drilled in the Domo zone, the 14 holes drilled in the Tesoros zone and
the surface and underground samples taken from the many artisan workings in
both zones. This estimate does not include any results from current drilling
which is testing other targets. The NI 43-101 report for this resource
estimate has been filed and is available on SEDAR.
    The Company has also completed a preliminary metallurgical evaluation of
the mineral resource and a number of different process strategies were
evaluated. These results are also contained in the filed NI 43-101 report.

    
    The results of the resource estimation are as follows:

    Indicated Resource Estimate Summary
    -------------------------------------------------------------------------
                                Avg. Grades (gpt)           Ounces
                        Tonnes  ---------------------------------------------
                                  Gold   Silver    Gold    Silver   Gold Equ.
    -------------------------------------------------------------------------
    Tesoros Indicated   490,700    3.9    138     61,500  2,177,300   84,860
    Domo Indicated      208,000    5.3    120     35,400    802,600   44,000
    -------------------------------------------------------------------------
    Total Indicated     698,700    4.3    133     97,000  2,979,800  128,900
    -------------------------------------------------------------------------


    Inferred Resource Estimate Summary
    -------------------------------------------------------------------------
                                Avg. Grades (gpt)           Ounces
                        Tonnes  ---------------------------------------------
                                  Gold   Silver    Gold    Silver   Gold Equ.
    -------------------------------------------------------------------------
    Tesoros Inferred     87,900    1.6    300      4,500    847,900   13,600
    Domo Inferred       252,000    5.5    175     44,600  1,418,000   59,700
    -------------------------------------------------------------------------
    Total Inferred      339,900    4.5    207     49,100  2,265,900   73,300
    -------------------------------------------------------------------------

    Gold equivalent ounces = gold ounces + ((silver ounces x 50%
    recovery) x $15/ounce / $700 per ounce)
    

    The cut-off grade used in the analysis was 0.5 grams per tonne and the
silver cut-off grade was 15 grams per tonne. An average specific gravity of
2.25 was used to calculate the tonnage of the mineralization. Laboratory
testing to determine the specific gravity of a representative sampling of the
cores will allow much of this indicated resource estimate to move to the
measured category. A $485,000 exploration program has been proposed to move
the inferred resources to the measured category as well.
    Although this estimate can only be considered a geological resource it is
worth pointing out that both mineralized zones outcrop at the surface and are
covered by little or no overburden. All of the calculated resources are within
40 meters of the surface and would be easily accessible by open pit mining.
When a feasibility study is completed which appropriately assesses both
dilution and mining losses then the geological resources may pass to a mining
reserve. It is emphasized that the preceding tables are an estimate of
resources and not reserves.
    Metallurgical recoveries of gold and silver using standard cyanide leach
technology recovery were 77% and 52% respectively. A process using alkaline
pre-activation at an elevated temperature achieved recoveries of 92% for gold
and 94% for silver. More work will be done to choose the appropriate
metallurgical process. For the purpose of this resource estimate an equivalent
gold calculation has been made using the worst case metallurgical conditions.
    The Company is currently drilling on the Igor concession and has
completed three of 9 scheduled holes. The first was a 350 meter wildcat hole
from the top of the Domo to understand the underlying geology. The second hole
was a deepening of the lower a Tesoros hole (7B) (outside the calculated
resource area) which was drilled originally in 2006. The first samples of this
hole were delivered to ALS Chemex on February 8, 2008. The third hole is
located in the Pampa de Igor between the Tesoros and Callanquitas zones. Over
100 meters of porphyry material was encountered beginning from surface and
samples should be delivered to the lab by the third week in February.
Dr. Warren Pratt will be visiting the project on February 15, 2008 and a
decision on additional drill holes for the Pampa de Igor zone will be taken
then. For the moment the drill has been moved to the Callanquitas zone where
drilling commenced February 8, 2008.
    The Callanquitas zone is considered the most prospective area of this
drill program and it is anticipated that a gold/silver breccia zone will be
encountered. The Company's geologic model also places the bulk of the
mineralized porphyry in this area and the current drill program will either
confirm or alter this view.

    This press release has been reviewed and approved by Randy Henkle,
P.Geol. and Murray Lytle, P.Eng. who are the company's Qualified Persons for
this resource estimate.

    The TSX Venture Exchange has neither approved nor disapproved of the
    information contained herein.

    Statements in this press release regarding the Company's business which
are not historical facts are "forward-looking statements" that involve risks
and uncertainties, such as estimates and statements that describe the
Company's future plans, objectives or goals, including words to the effect
that the Company or management expects a stated condition or result to occur.
Since forward-looking statements address future events and conditions, by
their very nature, they involve inherent risks and uncertainties. Actual
results in each case could differ materially from those currently anticipated
in such statements.

    %SEDAR: 00008773E




For further information:

For further information: John Rucci, President, (403) 508-2061 or by
e-mail rucci@telus.net

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