Sienna Gold Inc. ("Sienna" or the "Company") (TSX VENTURE:SGP) (LMA:SGP) is
pleased to announce the latest results from new drill holes at Callanquitas, on
the Igor project, La Libertad, Peru. These seven holes totalled 1561.5 meters
(m).


Drill Results

Holes CA-12-48 to CA-12-53 and CA-12-55, drilled on three different sections,
all intersected mineralization.


Drill hole CA-12-55 gave the best results: 12.7 m at 5.1 grams/tonne (g/t) gold
and 1163 g/t silver within an overall interval of 108 m at 1.4 g/t gold and 222
g/t silver. 


Likewise CA-12-48, with 11.0 m at 4.9 g/t gold and 189 g/t silver within an
overall interval of 17.0 m at 3.3 g/t gold and 129 g/t silver. 


Full results are given in the table below. A map of hole locations is shown
below, as are Sections NW4805 and NE4555. Further maps and cross sections will
be available on the Sienna Gold website.


To view the map associated with this release, please see the following link:
http://www.marketwire.com/library/20120801-sienna1.jpg


The Callanquitas Structure

Dr Warren Pratt, Director of Sienna Gold Inc, comments, "The ongoing drilling is
designed to test the Callanquitas Structure at 50 m intervals, in all
directions. These new results continue to demonstrate the lateral and vertical
continuity of the high grade mineralization. The area of high grade keeps
expanding and large parts of the Callanquitas Structure remain completely
un-tested by drilling. We are also demonstrating the presence of additional,
parallel, high grade structures. We are very much looking forward to the initial
resource calculation in October 2012." 


Assay results for drill holes CA-12-48 to CA-12-55.



----------------------------------------------------------------------------
Drill Hole                From        To    Interval(1) Weighted Averages(2)
----------------------------------------------------------------------------
                           (m)       (m)            (m) Gold (g/t)  Ag (g/t)
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-48                 70.70     72.30           1.60        9.0        37
----------------------------------------------------------------------------
CA-12-48                 74.00     76.00           2.00        0.0         3
----------------------------------------------------------------------------
CA-12-48                 81.00     85.60           4.60        2.1         8
----------------------------------------------------------------------------
CA-12-48                232.90    250.40           17.5        1.4         6
----------------------------------------------------------------------------
including                239.9     244.0            4.1        4.0         8
----------------------------------------------------------------------------
CA-12-48                284.00    301.00           17.0        3.3       129
----------------------------------------------------------------------------
including               287.50    298.50           11.0        4.9       189
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-49                  0.00      2.90           2.90        1.1         0
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-50                 25.60     34.70           9.10        0.3        25
----------------------------------------------------------------------------
CA-12-50                 64.00     73.60           9.60        0.2         3
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-51                 32.25     56.10          23.85        0.7        30
----------------------------------------------------------------------------
including                44.40     47.90           3.50        1.6        92
----------------------------------------------------------------------------
including                52.80     54.10           1.30        2.4        75
----------------------------------------------------------------------------
CA-12-51                 63.80     70.00           6.20        0.7        12
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-52                 92.80    141.00          48.20        1.3        11
----------------------------------------------------------------------------
including                92.80     94.00           1.20        1.2         3
----------------------------------------------------------------------------
including                98.00    106.20           8.20        3.0        39
----------------------------------------------------------------------------
including               116.90    117.90           1.00        6.0        14
----------------------------------------------------------------------------
including               124.50    127.50           3.00        7.1        10
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-53                118.00    143.30          25.30        3.4        80
----------------------------------------------------------------------------
including               122.20    138.50          16.30        5.0        95
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-54               Pending                                              
----------------------------------------------------------------------------
                                                                            
----------------------------------------------------------------------------
CA-12-55                 15.00     20.90           5.90        0.6        11
----------------------------------------------------------------------------
CA-12-55                176.00    284.00         108.00        1.4       222
----------------------------------------------------------------------------
including               178.40    184.00           5.60        1.3       382
----------------------------------------------------------------------------
including               194.60    207.30          12.70        5.1      1162
----------------------------------------------------------------------------
including               233.30    237.10           3.80        3.1        89
----------------------------------------------------------------------------
including               244.20    248.20           4.00        1.7       180
----------------------------------------------------------------------------
including               262.40    273.55          11.15        1.4       472
----------------------------------------------------------------------------
including               277.05    282.00           4.95        2.3        24
----------------------------------------------------------------------------
(1)It should be noted that these are all angled holes and downhole intervals
do not necessarily reflect the true width of the mineralized structure.     
(2)Weighted averages were calculated for continuously mineralized intervals 
using a bottom cut on 0.1-0.2 g/t gold, no top cut and minimum internal     
waste.                                                                      



A full list of drill holes and significant intercepts will be available on the
website: www.siennagold.com.


Exploration Update

Two rigs continue on site: one large tracked rig and a man portable rig. A total
of 14,000 m has been drilled to date.


The new resource for the Callanquitas Structure, based on approximately 20,000 m
of drilling, should be published in mid- to late October with the full NI 43-101
report to follow before the end of the year. 


Drilling will, however, continue at Callanquitas and extend to Domo and Tesoros
in late 2012/early 2013.


Sampling Methodology

Cores taken from the diamond drill rig are stored in plastic core boxes and
transported to the camp for detailed geotechnical and geological logging.
Density and Point Load testing are carried out. Afterwards, the core is cut on
site with a diamond saw. One half is then sent to an accredited laboratory in
various sample lengths. Randy Henkle (PGeol), the Company's independent
Qualified Person, completed a chain of custody review to ensure the integrity of
all sample data.


Assaying Methodology

The samples are analysed by SGS Laboratories in Lima by inductively coupled
plasma atomic emission spectroscopy for silver and 37 other elements (included
Hg and Te) and a 30 gram fire assay technique for gold. Samples above detection
limits are re-assayed using a gravimetric fire assay. The specific lab
procedures can be found in the Company's 43-101 report on the Igor property.


This press release was reviewed and approved by Dr Warren Pratt (CGeol) who is a
"Qualified Person" according to National Instrument 43-101.


Sienna Gold Inc is a gold exploration company with property interests in Peru.
Its key prospect is the Igor Mine Project, a formerly producing mine that the
Corporation is exploring further.


If you wish any further information, please feel free to contact John Rucci at
any of the contact points noted above.


John M Rucci, President

WARNING: the Company relies upon litigation protection for "forward looking"
statements. The information in this release may contain forward-looking
information under applicable securities laws. This forward-looking information
is subject to known and unknown risks, uncertainties and other factors that may
cause actual results to differ materially from those implied by the
forward-looking information. Factors that may cause actual results to vary
materially include, but are not limited to, inaccurate assumptions concerning
the exploration for and development of mineral deposits, currency fluctuations,
unanticipated operational or technical difficulties, changes in laws or
regulations, the risks of obtaining necessary licenses and permits, changes in
general economic conditions or conditions in the financial markets and the
inability to raise additional financing. Readers are cautioned not to place
undue reliance on this forward-looking information. The Company does not assume
the obligation to revise or update this forward-looking information after the
date of this release or to revise such information to reflect the occurrence of
future unanticipated events, except as may be required under applicable
securities laws.


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