Atna Reports Significant Gold Resource for its Columbia Gold Project



    




    
    GOLDEN, Colo., Sept. 10 /CNW/ -- Atna Resources Ltd. ("Atna") - (TSX:
ATN) is pleased to announce the completion of an NI 43-101 compliant mineral
resource estimate for the Columbia Project, located near Lincoln, Montana. 
The estimate establishes a measured and indicated mineral resource of 16.6
million tons grading 0.045 oz/ton gold containing 741,680 ounces of gold. In
addition, estimated inferred resources total 10.7 million tons grading 0.042
oz/ton gold containing 453,570 ounces of gold. Both estimates were calculated
at 0.020 oz/ton gold cut-off grade. Significant silver values are associated
with the gold resource.

    "The completion of this resource estimate is a major milestone for the
Company and it demonstrates that the Columbia project has the size and
economic potential required to fill our growth pipeline beyond our:
    
    --  Currently producing Briggs Gold Mine in California
    --  Permitted Reward gold project near Beatty, Nevada

    --  30% equity position in the Pinson gold project in Nevada.


    
    The significant resource position at the Columbia project will be a key
part of our long term development and growth strategy," states James Hesketh,
President & CEO.

    The resource estimate is reported in the following tables at varying
cut-off grades:



    
                               Gold               Silver
                               Grade   Contained  Grade    Contained
    Classifi-         Tons    (oz/ton  Ounces    (oz/ton   Ounces
    cation          (x1,000)    Au)     Gold       Ag)     Silver
    -----------     --------  -------  ------     -------  ------
    0.010 oz/ton Au cut-off
    ----------------------------------------------------------------
    Measured          10,439    0.031    326,720    0.116  1,213,350
    --------          ------    -----    -------    -----  ---------
    Indicated         22,401    0.029    644,560    0.093  2,074,110
    ---------         ------    -----    -------    -----  ---------
    Measured
     +
    Indicated(1)      32,839    0.030    971,280    0.100  3,287,460
    ------------      ------    -----    -------    -----  ---------
    

    
    Inferred          22,971    0.027    627,890    0.083  1,898,630
    --------          ------    -----    -------    -----  ---------
    

    
    0.020 oz/ton Au cut-off
    ----------------------------------------------------------------
    Measured           5,370    0.047    254,450    0.155    831,100
    --------           -----    -----    -------    -----    -------
    Indicated         11,294    0.043    487,230    0.116  1,304,380
    ---------         ------    -----    -------    -----  ---------
    Measured
     +
    Indicated(1)      16,665    0.045    741,680    0.128  2,135,480
    ------------      ------    -----    -------    -----  ---------
    

    
    Inferred          10,705    0.042    453,570    0.097  1,305,790
    --------          ------    -----    -------    -----  ---------
    


    
    0.050 oz/ton Au cut-off
    ----------------------------------------------------------------
    Measured           1,443    0.093    134,750    0.249    359,540
    -------            -----    -----    -------    -----    -------
    Indicated          2,489    0.089    220,980    0.175    435,880
    -------            -----    -----    -------    -----    -------
    Measured
     +
    Indicated(1)       3,932    0.091    355,730    0.202    795,420
    ------------       -----    -----    -------    -----    -------
    

    
    Inferred           2,236    0.086    191,440    0.117    261,740
    -------            -----    -----    -------    -----    -------
    

    
    (1)Rounding may cause totals to not precisely add up.


    
    The resource estimate is based on 337 drill holes totaling 146,973 feet
of drilling and 12,538 feet of surface trenching in 78 trenches carried out
between 1989 and 1993. Bulk sampling, development studies, metallurgical
testing, and environmental baseline studies were conducted during the same
time period. The deposit remains open for possible extension both along strike
and to depth.

    The Columbia property is covered by middle Tertiary andesitic volcanic
rocks. Gold and silver occurs with quartz-pyrite mineralization in several
low-sulfidation, epithermal, quartz-adularia vein swarms. The vein systems are
focused along north to northwest-trending faults and in stockwork and breccia
flooding adjacent to the principal shears. The gold mineralized structures
generally dip west and are up to 150 feet wide.

    A feasibility study was completed in 1991 by Phelps Dodge Mining Company,
then our joint venture operator.  The 1991 feasibility study showed positive
internal rates of return for all gold prices above $375 per ounce. The study
envisioned an open pit mine with a CIL mill using cyanide based gold recovery
systems to produce 75,000 ounces of gold per annum over a 7.5 year life.  Atna
retains the information and samples from this study including drill core and
reverse circulation chips.

    Montana State law prohibits the use of cyanide based gold recovery for
open pit mining.  However, preliminary metallurgical test work indicates that
90 percent to 94 percent of the gold is recoverable by conventional gravity
and flotation methods to produce a gold and silver concentrate. Final
processing of this gold concentrate may be accomplished by conventional
methods. Additional metallurgical test work and optimization studies will be
carried out to determine the most economic treatment process. Baseline
environmental water quality data collection has commenced at the site and the
Company plans to commence feasibility study work.
    

    Qualified Persons
    
    This press release was prepared under the supervision and review of
William Stanley, V.P. Exploration of Atna, a Licensed Geologist, and Qualified
Person with the ability and authority to verify the authenticity and validity
of information contained within this news release. The resource estimate
disclosed in this press release was prepared by Gustavson Associates, LLC of
Lakewood, Colorado, under the direction of Mr. Donald E. Hulse, P.E., an
independent Qualified Person. All mineral resource estimates were prepared
utilizing standard industry software and resource estimation methodologies.

    Definitions used in this release are consistent with those adopted by the
Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Council in
December 2005, as amended, and prescribed by the Canadian Securities
Administrators' National Instrument 43-101 and Form 43-101F1, Standards of
Disclosure for Mineral Projects. Mineral resources that are not mineral
reserves do not have demonstrated economic viability.

    For additional information on Atna Resources, the Columbia Project, and
Atna's other development projects, please visit our website at www.atna.com.
    


    
    This press release contains certain "forward-looking statements", as
defined in the United States Private Securities Litigation Reform Act of 1995,
and within the meaning of Canadian securities legislation,   Forward-looking
statements are statements that are not historical fact.  They are based on the
beliefs, estimates and opinions of the Company's management on the date the
statements are made and they involve a number of risks and uncertainties. 
Consequently, there can be no assurances that such statements will prove to be
accurate and actual results and future events could differ materially from
those anticipated in such statements.  The Company undertakes no obligation to
update these forward-looking statements if management's beliefs, estimates or
opinions, or other factors, should change.  Factors that could cause future
results to differ materially from those anticipated in these forward-looking
statements include: the Company might encounter problems such as the
significant depreciation of metals prices, accidents and other risks
associated with mining exploration and development operations, the risk that
the Company will encounter unanticipated geological factors, the Company's
need for and ability to obtain additional financing, the possibility that the
Company may not be able to secure permitting and other governmental clearances
necessary to carry out the Company's mine development plans, that will prevent
it from developing mining operations at the Columbia Gold Project, and the
other risk factors discussed in greater detail in the Company's various
filings on SEDAR (www.sedar.com) with Canadian securities regulators and its
filings with the U.S. Securities and Exchange Commission, including the
Company's 2008 Form 20-F dated March 31, 2009.

    Cautionary Note to U.S. Investors -- The United States Securities and
Exchange Commission permits U.S. mining companies, in their filings with the
SEC, to disclose only those mineral deposits that a company can economically
and legally extract or produce. We use certain terms in this report, such as
"measured," "indicated," and "inferred" "resources," that the SEC guidelines
strictly prohibit U.S. registered companies from including in their filings
with the SEC.
    

    FOR FURTHER INFORMATION, CONTACT:
    

    
    James Hesketh, President and CEO - (303) 278-8464
    Valerie Kimball, Investor Relations - toll free (877) 692-8182
    www.atna.com




    




For further information:

For further information: James Hesketh, President and CEO,
+1-303-278-8464, Valerie Kimball, Investor Relations, toll free,
1-877-692-8182, both of Atna Resources Ltd. Web Site: http://www.atna.com

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