Mirasol Reports High Grade Silver-Gold-Lead from the Cerro Plomo Breccia



    VANCOUVER, Feb. 28 /CNW/ - Mirasol Resources Ltd. (TSX-V: MRZ; Frankfurt:
M8R) is pleased to announce broad intervals of silver-gold-lead mineralization
from channel sampling of the Cerro Plomo prospect at its 100%-owned Libanesa
Project, Santa Cruz Province, Argentina.
    At Cerro Plomo, a 50 by 50 metre exposure of hydrothermal breccias and
fracture veining crops out at the edge of a salt pan (see press release
July 27, 2007). Mirasol completed one hundred and thirty meters of backhoe
trenches and outcrop channel sampling which partially tested the southern
extent of the mineralized outcrop at the edge of the salt pan.
    Trenching extended the area of outcropping breccia and showed that while
the breccia is closed off in the trenches, it is surrounded by a zone of
jarosite (iron oxide) fracture veining in the wall rock that remains open to
the south. The trenches carry anomalous values over their full lengths due to
the fracture veining (see Table 1). Length-weighted average results for the
full length of the trenches include 27.7 metres of 14.5 g/t silver,
0.45 g/t gold and 0.84% lead; 13.35 metres of 52.0 g/t silver, 0.74 g/t gold
and 0.85% lead, and 9.65 metres of 151.6 g/t silver, 0.53 g/t gold and
2.13% lead.
    Twenty-three select samples of the breccias' matrix and fracture veins
from the Cerro Plomo zone (see Table 2) averaged 325 g/t silver, 0.59 g/t gold
and 3.54% lead, with individual samples up to 2830 g/t silver, 2.21 g/t gold
and 48.45% lead. This suggests the potential for bonanza grade mineralization
where the breccias' matrix and veining become volumetrically more significant.

    
    -----------------------------------------------------------------

    Table 1: Cerro Plomo Breccia - Trench Results
    -----------------------------------------------------------------
                                    Interval   Silver   Gold    Lead
                           Trench    meters     g/t      g/t      %
    -----------------------------------------------------------------
    Full length of trench    C_1      13.35     52.0    0.74    0.85
    -----------------------------------------------------------------
    including                           3.7     93.1    0.94    1.53
    -----------------------------------------------------------------
    Full length of trench    C_2       9.65    151.6    0.53    2.13
    -----------------------------------------------------------------
    including                          5.15    248.1    0.81    3.49
    -----------------------------------------------------------------
    Full length of trench    T 1       27.7     14.5    0.45    0.84
    -----------------------------------------------------------------
    including                           7.7     19.4    0.89    1.47
    -----------------------------------------------------------------
    Full length of trench    T 2       19.2     17.0    0.83    1.07
    -----------------------------------------------------------------
    including                          10.9     13.3    1.21    1.36
    -----------------------------------------------------------------
    including                           2.8     26.2    0.39    1.46
    -----------------------------------------------------------------
    Full length of trench    T 3       14.7     15.0    0.53    0.78
    -----------------------------------------------------------------
    including                          4.85     40.0    1.19    0.98
    -----------------------------------------------------------------
    Full length of trench    T 4       14.3     20.7    0.28    0.81
    -----------------------------------------------------------------
    including                          0.95    119.0    0.50    4.75
    -----------------------------------------------------------------
    Full length of trench    T 5      13.35      7.1    0.07    0.28
    -----------------------------------------------------------------
    Full length of trench    T 6         24      7.7    0.42    0.82
    -----------------------------------------------------------------
    including                             2     17.9    0.50    1.52
    -----------------------------------------------------------------
    including                             2     11.0    1.06    1.61
    -----------------------------------------------------------------


    -------------------------------------------------

    Table 2: Select Breccia Matrix and Veinlet-Rock
     Chip
    -------------------------------------------------
               Interval    Silver      Gold     Lead
    Sample      meters      g/t         g/t       %
    -------------------------------------------------
    MRR01719        2       34.6       0.40     0.12
    -------------------------------------------------
    MRR01936        5       15.9       0.31     0.38
    -------------------------------------------------
    MRR02462        3       24.1       0.72     0.11
    -------------------------------------------------
    MRR04622      0.3       46.4       0.56     0.14
    -------------------------------------------------
    MRR04923      1.5         30       0.32     1.32
    -------------------------------------------------
    MRR04924        1       19.4       0.26     0.37
    -------------------------------------------------
    MRR04925      1.5        160       0.22     0.97
    -------------------------------------------------
    MRR04926      1.5         61       1.34     1.20
    -------------------------------------------------
    MRR04927        2       18.1       0.22     0.51
    -------------------------------------------------
    MRR04928        1       32.5       0.62     0.40
    -------------------------------------------------
    MRR04929        2       23.2       0.08     0.58
    -------------------------------------------------
    MRR04930      1.5       32.2       0.24     0.70
    -------------------------------------------------
    MRR04931        1       61.4       2.21     0.62
    -------------------------------------------------
    MRR04932        1          6       0.16     0.57
    -------------------------------------------------
    MRR04933        1      69.35       0.08     0.17
    -------------------------------------------------
    MRR04934      1.2        9.6       0.34     0.66
    -------------------------------------------------
    MRR04935      1.5        8.1       0.30     0.94
    -------------------------------------------------
    MRR04936        2          6       0.36     1.31
    -------------------------------------------------
    MRR04937      1.5       1778       0.92     1.16
    -------------------------------------------------
    MRR04938      1.2        100       0.52     1.57
    -------------------------------------------------
    MRR05151     0.35       72.9       0.53     0.18
    -------------------------------------------------
    MRR05152      0.3       2830       2.23    48.45
    -------------------------------------------------
    MRR05154     0.25       2050       1.91    18.96
    -------------------------------------------------
    AVERAGE               325.60       0.59     3.54
    

    A preliminary petrologic study of the breccia shows a jarosite (iron
oxide) matrix with supergene lead and copper minerals, containing clasts of
crystalline galena with inclusions and rims of the silver-bearing minerals.
This indicates the breccia hosts at least two phases of primary
mineralization, the earliest being transported galena as clasts from depth
beneath the surface outcrops, and the second occurs as silver sulphides and
silver sulphosalt minerals deposited on the galena clasts and in the breccia
matrix.
    Cerro Plomo is part of a larger silver-gold-lead mineralized zone that is
intimately associated with an andesitic dyke swarm with a radial pattern. The
mineralization manifests as a series of narrow hydrothermal breccias and
sub-metre veins, partially exposed through shallow cover over a one square
kilometre area. Mirasol's mapping and detailed ground magnetic survey suggest
a prospective geological and structural setting which may host further
concealed mineralization. Mirasol has completed an MMI (mobile metal ion) soil
grid over a 1.4 by 1.2 kilometre area, centred on Cerro Plomo, designed to
identify additional mineralized zones. Assay results from this survey are
pending.
    Mirasol's management is highly encouraged by results received to date
from the Libanesa Project. Cerro Plomo represents a quality drill target with
the potential for bulk tonnage silver-gold-lead mineralization, and-or for
possible bonanza grade mineralization in more restricted bodies. Future drill
testing is required to determine if Cerro Plomo is a pipe, or the top of a
larger mineralized breccia body. Indications to date suggest that there is
good potential to identify further zones of mineralization within the project.
    Stephen C. Nano, Vice President of Exploration for Mirasol, is the
Qualified Person under NI 43-101 who has prepared and approved the technical
content of this news release.

    Surface Geochemical Sampling: All assay results reported herein are for
rock and stream sediment samples collected from surface; assay results from
drill core samples may be higher, lower or similar to results obtained from
surface samples.

    Quality Assurance/Quality Control: Exploration at Mirasol's Argentina
Projects is supervised by Mirasol's Exploration Manager, Timothy Heenan and
Paul Lhotka, Principal Geologist, both qualified persons under NI 43-101. All
technical information for the Company's projects is obtained and reported
under a formal quality assurance and quality control (QA/QC) program. Rock
chip and stream sediment samples are collected under the supervision of
Company geologists in accordance with standard industry practice. Samples are
dispatched via commercial transport to an ISO 9001:2000-accredited laboratory
in Mendoza, Argentina for analysis. Results are routinely examined by an
independent geochemist to ensure laboratory performance meets required
standards.

    The TSX Venture Exchange has not reviewed and does not accept
    responsibility for the adequacy or accuracy of the content of this news
    release

    %SEDAR: 00021558E




For further information:

For further information: Mary L. Little, President & CEO, Tel: (604)
602-9989, Fax: (604) 609-9946, Email: contact@mirasolresources.com, Website:
www.mirasolresources.com; Investor Relations: Trent Dahl, Ascenta Capital
Partners Inc., Phone: (604) 684-4743, ext. 228, Toll free: 1-866-684-4743,
ext. 228


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