Great Basin Gold Continues to Encounter Bonanza Gold Grades at Hollister Property



    VANCOUVER, April 20 /CNW/ - Great Basin Gold Ltd. ("Great Basin Gold" or
the "Company"), (TSX: GBG; NYSE Amex:   GBG; JSE: GBG) announces further
high-grade exploration drilling results at its Hollister property in Nevada
for the quarter ending March 31, 2009. An exceptional result was achieved with
underground borehole HDB-274 which intersected 50.11 oz per short ton ("opt")
over 0.7 ft (1,718 g/t Au over 0.23 m) on the western strike extension of the
Central Clementine vein. This is 1 of 25 vein intersections during the quarter
in excess of 1 opt Au (34.28 g/t Au).
    During the quarter, underground evaluation and exploration drilling for
other mineralised structures totaled 13,503 ft (4,092 m). Surface drilling
totaled 1,449 ft (439 m). The programs continue to encounter high-grade
intersections on the Clementine and Gwenivere vein systems (see below),
disseminated mineralisation in the overlying Tertiary volcanics, as well as
further encouraging intersections from the Hatter Graben Veins to the east of
the Hollister development. Geological modeling and mineral resource estimation
of these mineral systems is currently underway.
    The underground drilling is providing more information about the strike
(3,000 ft/ 980 m) and vertical (1,300 ft/ 396 m) continuity of the vein
systems. The Hollister mineral system currently comprises 24 discrete
east-west striking subvertical veins, which constitute the Clementine and
Gwenivere groups. The system is still open along strike, at depth, and in
areas up to and above the Ordovician/Tertiary Unconformity. Twenty-six (26)
underground boreholes were completed, of which fifteen (15) were for
exploration, seven (7) targeted the Gwenivere system and four (4) tested the
Clementine system.
    Recent results from underground exploration, underground delineation and
surface drilling are summarised below. A complete tabulation of the Hollister
drilling results is available on the Great Basin Gold website
www.grtbasin.com.

    
    Underground Programs

    Underground exploration drilling results include:

    -------------------------------------------------------------------------
                            Downhole             Significant Intersections
                         ----------------------------------------------------
                              Vein
                          Intersection  Drilled  Est.   Analytical Results
                               (ft)     Thick-  True  -----------------------
       Vein        Drill --------------  ness  Width    Au    Au    Ag    Ag
      System      Hole ID  From      To  (ft)   (ft)  (opt) (g/t) (opt) (g/t)
    -------------------------------------------------------------------------
    Exploration  HDB-255   91.4    92.0  0.6   0.6   1.490   51.09  0.6   21
    -------------------------------------------------------------------------
    Exploration  HDB-259  No significant intercepts
    -------------------------------------------------------------------------
    Exploration  HDB-265  552.8   554.3  1.5   1.5   0.290    9.94  0.7   24
    -------------------------------------------------------------------------
                         1770.4  1774.0  3.6   3.6   0.560   19.20  0.2    7
    -------------------------------------------------------------------------
    Exploration  HDB-266  No significant intercepts
    -------------------------------------------------------------------------
    Exploration  HDB-271  440.7   441.4  0.7   0.7   0.338   11.59  1.6   55
    -------------------------------------------------------------------------
                          846.1   846.8  0.7   0.7   0.361   12.38  1.8   62
    -------------------------------------------------------------------------
    Exploration  HDB-274    8.8     9.9  1.1   1.1   0.139    4.77  0.7   24
    -------------------------------------------------------------------------
                          133.9   134.5  0.6   0.6   0.308   10.56  0.3   10
    -------------------------------------------------------------------------
                          223.8   224.4  0.6   0.6   0.348   11.93  0.6   21
    -------------------------------------------------------------------------
                          238.1   238.8  0.7   0.7  50.110 1718.06 135.1 4632
    -------------------------------------------------------------------------
                          249.0   250.1  1.1   1.1   4.120  141.26 14.8  507
    -------------------------------------------------------------------------
    Blanket       HSD-57   18.4    19.3  0.9   0.7   4.070  139.54  5.1  175
    -------------------------------------------------------------------------
                          199.0   219.0 20.0  16.4   0.114    3.91 less  less
                                                                   than  than
                                                                    0.1    5
    -------------------------------------------------------------------------
    Blanket       HSD-58   11.8    12.8  1.0   0.7   1.085   37.20  1.9   65
    -------------------------------------------------------------------------
                          194.5   199.0  4.5   3.2   0.109    3.74  0.2    7
    -------------------------------------------------------------------------
                          224.0   229.0  5.0   3.5   0.101    3.46  0.2    7
    -------------------------------------------------------------------------



    -------------------------------------------------------------------------
                            Downhole             Significant Intersections
                         ----------------------------------------------------
                              Vein
                          Intersection  Drilled  Est.   Analytical Results
                               (ft)     Thick-  True  -----------------------
       Vein        Drill --------------  ness  Width    Au    Au    Ag    Ag
      System      Hole ID  From      To  (ft)   (ft)  (opt) (g/t) (opt) (g/t)
    -------------------------------------------------------------------------
                          284.0   289.0   5.0   3.5   0.333  11.42  0.4   14
    -------------------------------------------------------------------------
                          294.0   304.0  10.0   7.0   0.193   6.62  0.4   14
    -------------------------------------------------------------------------
                          339.0   350.0  11.0   7.8   0.134   4.59  0.3   10
    -------------------------------------------------------------------------
    Blanket       HSD-59   27.2    27.7   0.5   0.3   0.642  22.01  2.8   96
    -------------------------------------------------------------------------
                          348.0   353.0   5.0   2.5   0.017   0.58 13.8  473
    -------------------------------------------------------------------------
                          388.0   390.0   2.0   1.0   0.053   1.82 24.5  840
    -------------------------------------------------------------------------
    Blanket       HSD-60   13.4    14.4   1.0   0.8   0.557  19.10  2.0   69
    -------------------------------------------------------------------------
                          193.8   218.2  24.4  18.7   0.113   3.87 less  less
                                                                   than  than
                                                                    0.1    5
    -------------------------------------------------------------------------
    Blanket       HSD-61    9.0    10.6   1.6   0.8   0.330  11.31  1.2   41
    -------------------------------------------------------------------------
                           28.5    29.0   0.5   0.3   0.430  14.74  2.9   99
    -------------------------------------------------------------------------


    There are a number of highlights from the underground exploration
    drilling, including:

    -   HDB-265 was drilled at a shallow angle eastwards from the main
        lateral development and towards the Hatter Graben prospect. The
        borehole intersected a zone of tectonic brecciation and shearing that
        separates Ordovician metasedimentary rocks and downthrown Tertiary
        volcanic rocks at 1,504-1,534 ft (456-465 m). Follow-up drilling is
        targeting below the Tertiary/Ordovician unconformity for epithermal
        veining. Two zones of mineralisation have been intersected at 553 and
        1,772 ft, grading 0.29 opt over 1.5 ft (9.9 g/t over 0.5 m) and
        0.56 opt over 3.6 ft (19.2 g/t over 1.1 m), respectively. These
        intersections require follow-up but are significant, indicating the
        existence of epithermal veining between the current eastern extent of
        the Clementine/Gwenivere vein system (as defined by drilling) and the
        Hatter Graben target;

    -   HDB-274 intersected spectacularly high grade gold mineralisation
        (4.1 opt Au/ 141 g/t Au over 1.1 ft; 50.1 opt Au/ 1,718 g/t Au over
        0.7 ft) associated with the Central and East Clementine vein system,
        notably towards the west of the exploration infrastructure.
        Underground structural mapping in the area is indicating the
        development of a new discrete high grade shoot containing the bonanza
        grades; and

    -   HSD 57-61 targeted "Blanket Zone" mineralisation hosted in the
        overlying Tertiary volcanics and proximal to the Tertiary/Ordovician
        unconformity, and encountered a number of broad intersections
        (7 ft/2 m to 18.7 ft/6 m) grading between 0.1 and 0.4 opt Au (3 and
        14 g/t Au). A number of high grade zones associated with epithermal
        vein clay-rich zones in the Vanini Formation (Ordovician) host rocks
        were also intersected in these boreholes. The Blanket Zone
        intersections are of significance, as there is growing evidence for
        the existence of a number of discrete broader zones of disseminated
        gold mineralisation hosted in proximity to the overlying Tertiary
        volcanic/Ordovician unconformity and penetrative subvertical
        structures probably controlling vein mineralisation below in the
        Ordovician Vanini host meta-sedimentary rocks. Previous open pit
        mining and heap leaching of similar style mineralisation at Hollister
        was conducted by the Touchstone - Galactic JV (1990-1992). This
        operation extracted 116,000 oz Au at 0.046 opt Au (1.57 g/t Au) from
        within a historical resource of 2.8 million oz Au grading 0.035 opt
        Au (1.20 g/t Au). Great Basin Gold intends to remodel the area of
        previous mining with a view to developing a predictive structural and
        alteration model to detect Blanket style mineralisation.

    Underground delineation drilling has continued on the Clementine-Gwenivere
vein systems. Results are summarised below:

    -------------------------------------------------------------------------
                            Downhole             Significant Intersections
                         ----------------------------------------------------
                              Vein
                          Intersection  Drilled Est.    Analytical Results
                               (ft)     Thick-  True  -----------------------
       Vein      Drill   --------------  ness  Width    Au    Au    Ag    Ag
      System    Hole ID    From      To  (ft)   (ft)  (opt) (g/t) (opt) (g/t)
    -------------------------------------------------------------------------
    Clementine  HDB-272   No Significant Intercepts
    -------------------------------------------------------------------------
    Clementine  HDB-273   No Significant Intercepts
    -------------------------------------------------------------------------
    Clementine  HDB-279   149.8   150.9   1.1   0.9   0.203   6.96  0.2    7
    -------------------------------------------------------------------------
                          172.6   173.1   0.5   0.4   0.109   3.74  0.2    7
    -------------------------------------------------------------------------
                          212.0   212.6   0.6   0.5   0.216   7.41  0.3   10
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
                          374.2   375.0   0.8   0.7   0.110   3.77  0.1    5
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
    Clementine  HDB-280   216.5   217.5   1.0   0.6   0.113   3.87  0.1    5
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
                          218.8   219.7   0.9   0.6   0.133   4.56  0.1    5
    -------------------------------------------------------------------------
    Gwenivere   HSD-46     12.0    13.4   1.4   1.0   1.390  47.66  0.8   27
    -------------------------------------------------------------------------
                           78.0    78.6   0.6   0.5   2.610  89.49  4.6  158
    -------------------------------------------------------------------------
                           83.6    84.1   0.5   0.4   1.855  63.60  3.1  106
    -------------------------------------------------------------------------
                          165.9   166.6   0.7   0.5   0.313  10.73  3.6  123
    -------------------------------------------------------------------------
                          205.9   207.1   1.2   0.9   0.518  17.76  0.6   21
    -------------------------------------------------------------------------
                          235.0   238.5   3.5   2.7   0.959  32.88  2.1   72
    -------------------------------------------------------------------------
                          273.3   275.8   2.5   1.8   0.421  14.43  1.5   51
    -------------------------------------------------------------------------
                          302.7   304.2   1.5   1.1   5.610 192.34 12.0  411
    -------------------------------------------------------------------------
    Gwenivere   HSD-48     82.3    83.3   1.0   0.7   3.900 133.71  6.3  216
    -------------------------------------------------------------------------
                          239.0   242.0   3.0   2.1   1.550  53.14  4.0  136
    -------------------------------------------------------------------------
                          252.9   254.0   1.1   0.8   0.657  22.53  0.5   17
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
                          272.8   274.0   1.2   0.8   0.455  15.60  0.1    5
    -------------------------------------------------------------------------
    Gwenivere  HSD-49      11.8    12.6   0.8   0.7   2.010  68.91  1.3   45
    -------------------------------------------------------------------------
                           66.1    71.5   5.4   4.7   0.164   5.62  0.2    6
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
                          139.5   140.3   0.8   0.7   0.106   3.63    5  0.1
    -------------------------------------------------------------------------
                          147.0   150.8   3.8   3.3   0.651  22.32  2.4   81
    -------------------------------------------------------------------------
                          206.0   208.1   2.1   1.8   0.324  11.11  0.5   17
    -------------------------------------------------------------------------
                          237.6   238.4   0.8   0.7   0.411  14.09 15.8  542
    -------------------------------------------------------------------------
                          267.5   268.8   1.3   1.1   1.740  59.66  5.0  171
    -------------------------------------------------------------------------
                          274.3   275.1   0.8   0.7   0.155   5.31 14.4  494
    -------------------------------------------------------------------------
                          365.2   366.0   0.8   0.7   1.915  65.66  1.0   34
    -------------------------------------------------------------------------
    Gwenivere  HSD-50       7.0    12.8   5.8   5.5   1.455  49.89  0.6   19
    -------------------------------------------------------------------------
                           57.2    57.7   0.5   0.5   1.145  39.26  1.8   62
    -------------------------------------------------------------------------
                           76.5    77.0   0.5   0.5   0.453  15.53  0.3   10
    -------------------------------------------------------------------------
                          167.0   171.8   4.8   4.6   0.286   9.81  0.1    3
    -------------------------------------------------------------------------
                          342.0   343.0   1.0   0.9   1.720  58.97  2.3   79
    -------------------------------------------------------------------------
                          348.5   349.5   1.0   0.9   0.155   5.31  8.0  274
    -------------------------------------------------------------------------
    Gwenivere  HDB-276    113.0   116.0   3.0   1.7   1.310  44.90 10.7  366
    -------------------------------------------------------------------------
                          122.0   127.0   5.0   3.5   1.470  44.60  7.4  255
    -------------------------------------------------------------------------
                          251.0   253.0   2.0   1.4   0.360  12.35  1.3   44
    -------------------------------------------------------------------------
    Gwenivere  HSD-47      15.2    17.0   1.8   1.3   1.035  35.50  3.6  124
    -------------------------------------------------------------------------
                           85.0    85.6   0.6   0.4   2.140  73.30 13.1  449
    -------------------------------------------------------------------------
                                                                   less  less
                                                                   than  than
                          400.0   410.0  10.0   7.0   0.245   8.40  0.1    5
    -------------------------------------------------------------------------
                          475.0   480.0   5.0   3.5   0.101   3.46  0.5   16
    -------------------------------------------------------------------------
    Gwenivere  HSD-51      14.8    15.6   0.8   0.7   0.155   5.31  0.5   17
    -------------------------------------------------------------------------
                           72.4    73.1   0.7   0.6   1.135  38.91  0.9   31
    -------------------------------------------------------------------------
                          135.4   136.2   0.8   0.7   0.389  13.34  0.8   27
    -------------------------------------------------------------------------
                          150.3   150.9   0.6   0.5   3.300 113.14 19.5  669
    -------------------------------------------------------------------------
                          194.0   207.2  13.2  11.4   0.251   8.61  0.9   29
    -------------------------------------------------------------------------
    

    Mineralisation in the Gwenivere Veins continues to give intersections
with robust grades; seven boreholes averaged 0.563 opt Au over 1.9 ft (19.3
g/t Au over 0.6 m).
    Significant advances have been made during the quarter with revised
geological modeling and detailed underground mapping. These observations are
providing more insight and predictability into the controls of the
Clementine-Gwenivere vein systems, and certain aspects are being incorporated
into the mineral resource review which is nearing completion.

    Surface Programs

    The surface drilling program is focusing on the Hatter Graben target,
located about 5,000 ft (1,667 m) east of the Clementine-Gwenivere vein
cluster. The geology of the area is highlighted by a number of
North/Northwest-South/Southeast and E-W structures, as well as Eocene to
Tertiary aged intermediate to felsic intrusive rocks. However a number of
narrow and discrete vein intersections support an East-West trending vein
swarm not unlike the Clementine-Gwenivere system. The Hatter Graben target
area now has a strike extent of approximately 3,000 ft (1,400 m) and a width
of up to 1,320 ft (400 m), which is of similar extent to the Hollister vein
system. During the quarter, Hole HDB-285 was completed, and the drill rig has
now been moved to complete certain geotechnical investigations.

    
    Summary of surface results received during Q1 2009 are shown below:

    -------------------------------------------------------------------------
                            Downhole             Significant Intersections
                         ----------------------------------------------------
                              Vein
                          Intersection  Drilled Est.    Analytical Results
                               (ft)     Thick-  True  -----------------------
       Vein      Drill   --------------  ness  Width    Au    Au    Ag    Ag
      System    Hole ID    From    To    (ft)   (ft)  (opt) (g/t) (opt) (g/t)
    -------------------------------------------------------------------------
    Hatter      H8-283   2054.6  2055.5   0.9   0.6   0.964  33.05  29.0  994
    -------------------------------------------------------------------------
                         2131.8  2133.3   1.5   1.1   1.776  60.89   8.2  281
    -------------------------------------------------------------------------
                         2134.8  2139.0   4.2   2.9   0.352  12.07   9.4  322
    -------------------------------------------------------------------------
    Hatter      H8-284   2286.7  2288.2   1.5   1.1   0.032   1.10          0
    -------------------------------------------------------------------------
                         2296.2  2300.0   3.8   2.7   0.025   0.86          0
    -------------------------------------------------------------------------
                         2302.8  2304.3   1.5   1.1   0.066   2.26          0
    -------------------------------------------------------------------------
                         2559.0  2562.3   3.3   2.3   0.023   0.79          0
    -------------------------------------------------------------------------
    Hatter      H8-285   1791.3  1803.8  12.5   8.8   0.467  16.01  13.1  451
    -------------------------------------------------------------------------
                         2109.5  2115.8   6.3   4.4      Assays pending
    -------------------------------------------------------------------------
                         2184.4  2185.3   0.9   0.6      Assays pending
    -------------------------------------------------------------------------
                         2317.3  2318.8   1.5   1.1      Assays pending
    -------------------------------------------------------------------------
    

    The most significant intersections were gained from H8-285, which was
completed in February to a depth of 2,937 ft (895.2 m). H8-285 encountered the
most robust and wide mineralised intersection to date in the Hatter Graben
Vein system, a 12.5 ft (3.8 m) vein drill intercept. Noteworthy is that this
wide vein intercept is hosted in an intrusive felsic porphyry rock unit,
normally an unfavorable host rock in the graben area. The mineralized zones
are marked by banded quartz veins with naumannite (selenium sulphide), bladed
quartz with visible gold and naumannite, and brecciation zones with
sulphidation and silicification. A follow up drill program targeting this area
has been designed.
    The Hollister Development Project still has significant exploration
potential on the surrounding claim areas. A total of sixteen (16) targets have
been identified for future exploration.

    
    -------------------------------------------------------------------------
    TARGET CLASSIFICATION                No                TARGET
    -------------------------------------------------------------------------
    Reserve delineation                   1      Hollister Development Block
    -------------------------------------------------------------------------
    Resource delineation                  2              Gwenivere
                                                      East Clementine
    -------------------------------------------------------------------------
                                                       Hatter Graben
                                                   East Clementine Fault
    Advanced follow-up targets            5             South Velvet
                                                        Blanket zone
                                                          Big Gwen
    -------------------------------------------------------------------------
                                                         Butte Fault
    Follow-up targets                     4              Heap Leach
                                                      Western Sinters
                                                        North Hatter
    -------------------------------------------------------------------------
    Identified targets                    2         Bounding structures
    -------------------------------------------------------------------------
    Regional targets                      2       Other Hollister permits
    -------------------------------------------------------------------------
    TOTAL                                16
    -------------------------------------------------------------------------
    

    All the project geospatial data from historic and current exploration is
in the process of being collated, reviewed and structural targets reassessed
and priority ranked. The development of a structural model for the area is
seen as an important component to predicting both Tertiary and Ordovician
hosted mineralisation.
    Ferdi Dippenaar, President and CEO, commented: "Good progress continues
to be made with the planned exploration programs of the Hollister Development
Block and the Hatter Graben discovery area.
    "Our underground exploration drilling continues to prove strike and depth
extensions to the Hollister system. The drilling eastwards towards the Hatter
system is also indicating new intermediary zones of mineralisation between the
Hollister and Hatter systems. The Hatter system will be subject to follow-up
drilling, specifically designed to ascertain the lateral and depth continuity
of the vein system. The geological team is also making good progress
unraveling structural controls to the mineralisation in general, and future
drilling will continue to test the predictive model being developed.
    "On the mine development side, we are continuing to test and optimize the
applicability of thermal fragmentation technology as a cost effective solution
to minimizing dilution during extraction of high grade narrow veins less than
3 ft in width."
    Phil Bentley, Pr.Sci.Nat. (SACNAS) Vice President for Geology and
Exploration for the Company and a qualified person, has reviewed this news
release on behalf of Great Basin Gold.

    
    Ferdi Dippenaar
    President and CEO

    No regulatory authority has approved or disapproved the information
    contained in this news release.
    

    This release includes certain statements that may be deemed
"forward-looking statements". All statements in this release, other than
statements of historical facts, that address possible future commercial
production, reserve potential, exploration drilling results, development,
feasibility or exploitation activities and events or developments that Great
Basin Gold expects to occur are forward-looking statements. Although the
Company believes the expectations expressed in such forward-looking statements
are based on reasonable assumptions, such statements are not guarantees of
future performance and actual results or developments may differ materially
from those in the forward-looking statements. Factors that could cause actual
results to differ materially from those in forward-looking statements include
market prices, exploitation and exploration successes, continuity of
mineralization, uncertainties related to the ability to obtain necessary
permits, licenses and title and delays due to third party opposition,
geopolitical uncertainty, changes in government policies regarding mining and
natural resource exploration and exploitation, and continued availability of
capital and financing, and general economic, market or business conditions.
Investors are cautioned that any such statements are not guarantees of future
performance and those actual results or developments may differ materially
from those projected in the forward-looking statements. For more information
on the Company, Investors should review the Company's annual Form 40-F filing
with the United States Securities and Exchange Commission and its home
jurisdiction filings that are available at www.sedar.com.





For further information:

For further information: For additional details on Great Basin Gold Ltd.
and its gold properties, please visit the Company's website at
www.grtbasin.com or contact Investor Services: Tsholo Serunye in South Africa,
27 (0) 11 301 1800; Michael Curlook in North America, 1-888-633-9332; Barbara
Cano at Breakstone Group in the USA, (646) 452-2334

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