Results of Warren Pratt, PhD visit to Igor

    CALGARY, June 21 /CNW/ - Sienna Gold Inc. (SGP.V TSX Venture Exchange)
reports the results of ongoing soil, trench and rock sampling at its Igor
property as reviewed by Dr. Warren Pratt. This program is designed to identify
the center of porphyry gold (copper) mineralization at Igor. This is Dr.
Pratt's second visit to the site following the recognition in 2006 of
widespread porphyry-style (phyllic) alteration and of porphyry intrusions. In
addition to the porphyry potential, new manto-, and possible sandstone-,
hosted targets are identified.

    The next phase of work (2 to 3 months) is designed to:

    -   Identify the mineralized core of the porphyry system
    -   Identify appropriate drill targets
    -   Determine sandstone-hosted gold potential (cf. Alto Chicama,

    Recent soil and trench sampling has widened the geochemical anomalies at
Igor. The geochemical pathfinder elements for gold, such as arsenic, are
strongly anomalous over a strike length of more than two kilometres. An
unusually strong molybdenum anomaly, with values up to 0.07% Mo, occurs on the
ridge axis at Igor (Domo). This may point to the strongly mineralized core of
a gold-copper porphyry system. Recent trenching has confirmed the presence of
gold-mineralized porphyry, a very important development at Igor. The intensity
of phyllic alteration is also being used to help identify the core of the
porphyry system.
    Soil, trench and rock sampling is being expanded. This work will fill in
the data gaps and is expected to extend the geochemical anomalies. The company
has permits and is planning to drill test the porphyry and mantos in the fall
of 2007.

    Sampling and assaying methodology

    Rock chip, channel and soil samples were taken at regular intervals along
pre-determined sampling lines. Complete descriptions of the samples were
recorded (rock type, alteration, structure, mineralization) and the samples
were sent for geochemical analysis.
    The samples were analyzed by ALS Chemex Laboratories in Lima by
inductively coupled plasma atomic emission spectroscopy ('ICP-AES') for silver
and 33 other elements and a 30 gram fire assay technique for gold. Samples
which exceeded the detection limits were re-assayed using a gravimetric fire
assay technique. The specific procedures used by the lab can be found in the
company's 43-101 report on the Igor property.
    Sienna Gold Inc. continues to explore in Peru for precious and base
metals. Its major projects are Igor and Pachmn Alto.
    This press release has been reviewed and approved by Murray Lytle,
P.Eng., the company's Qualified Person.

    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

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