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Message: Reports Updated NI 43-101 Compliant Resource Estimate for the Bissa Gold Project

Reports Updated NI 43-101 Compliant Resource Estimate for the Bissa Gold Project

posted on Jun 19, 2009 04:44AM
June 19, 2009
High River Gold Reports Updated NI 43-101 Compliant Resource Estimate for the Bissa Gold Project
TORONTO, ONTARIO--(Marketwire - June 19, 2009) - High River Gold Mines Ltd. ("High River" or the "Company") (TSX:HRG) would like to report the results of a revised Mineral Resource evaluation completed for the Bissa Gold Exploration Project ("Bissa"), by SRK Consulting (Canada) Inc. ("SRK"). The revised Mineral Resource estimate was prepared following the National Instrument 43-101 ("NI 43-101") guidelines and incorporates new assay results from drilling and trenching performed by High River during 2007 and 2008. It was prepared to support conceptual mine design work currently being completed by engineering consultants GENIVAR ("GENIVAR") to evaluate the feasibility of an open pit mining and processing operation at Bissa. The effective date of the Mineral Resource Statement is April 23, 2009. The Mineral Resource Statement is contained within a Technical Report prepared by SRK dated June 18, 2009.

Relative to a previous Mineral Resource estimate incorporating Mineral Resource evaluations dated September 28, 2004 and May 23, 2006, Measured Mineral Resources increased by 11%, Indicated Mineral Resources increased by 43%, and Inferred Mineral Resources increased by 18%, as follows:

Bissa Gold Exploration Project Mineral Resource Estimate(i) (100% basis)

----------------------------------------------------------------------------
                            Measured and Indicated Resources
Resource              ------------------------------------------------------
Category              Tonnage (t)    Gold Grade (g/t)    Contained Gold (oz)
----------------------------------------------------------------------------
Measured                 906,000                3.13                 91,000
----------------------------------------------------------------------------
Indicated             14,931,000                1.73                832,000
----------------------------------------------------------------------------
Total                 15,838,000                1.81                924,000
----------------------------------------------------------------------------

----------------------------------------------------------------------------
                                   Inferred Resources
Resource              ------------------------------------------------------
Category              Tonnage (t)    Gold Grade (g/t)    Contained Gold (oz)
----------------------------------------------------------------------------
Total Inferred        17,730,000                1.40                799,000
----------------------------------------------------------------------------

(i) All figures rounded to reflect the relative accuracy of estimates.
    Reported Resources are within optimized pit shells at a cut-off grade of
    0.5 g/t gold
The revised Mineral Resource estimate is constrained within conceptual pit shells and includes only those resource blocks exhibiting "reasonable prospects for economic extraction" from an open pit mine after considering certain additional physical and economic constraints (please see note #3 below, under section titled "Resource Estimate").

The revised Mineral Resource estimate was based on assay results derived from samples taken from 118 trenches (11,935 metres), 181 diamond drill holes (23,068 metres), and 462 reverse circulation drill holes (43,823 metres) completed over the period 2004 to 2008.

After review of the Bissa data, SRK concluded that:

- There is an opportunity to upgrade the resource classification of portions of the Bissa gold mineralization with additional infill drilling targeting the Inferred Mineral Resources near surface at Zone 51W, IO, Bissa SW and Zone 51E.

- There is potential to increase the gold resource at IO with step-out and infill drilling along strike and down plunge, as the controls on the distribution of the higher grade gold mineralization in IO are not well understood.

- Gold mineralization is open along strike to the southwest of Zones 51W and 52.

- Gold mineralization in most of the auriferous zones extends at depth into fresh rock below the current drilling, providing an opportunity to expand the gold Mineral Resources at depth, especially in Zone 52 where the depth of the conceptual pit shells used to report Mineral Resources is limited by data availability.

Resource Estimate

Bissa Mineral Resource Statement(i) (100% basis), SRK Consulting, April 23, 2009

----------------------------------------------------------------------------
----------------------------------------------------------------------------
Weathering profile                  Tonnage    Gold Grade    Contained Gold
                                     (tonne)         (g/t)          (ounces)
----------------------------------------------------------------------------
                               Measured Mineral Resources
----------------------------------------------------------------------------
Laterite
Saprolite                           896,000          3.14            90,000
Saprock                              10,000          2.86             1,000
Fresh Rock
----------------------------------------------------------------------------
Total Measured                      906,000          3.13            91,000
----------------------------------------------------------------------------
                              Indicated Mineral Resources
----------------------------------------------------------------------------
Laterite                            759,000          0.78            19,000
Saprolite                         8,610,000          1.78           493,000
Saprock                           2,371,000          1.89           144,000
Fresh Rock                        3,270,000          1.70           178,000
----------------------------------------------------------------------------
Total Indicated                  15,010,000          1.73           834,000
----------------------------------------------------------------------------
                         Measured & Indicated Mineral Resources
----------------------------------------------------------------------------
Laterite                            759,000          0.78            19,000
Saprolite                         9,507,000          1.91           584,000
Saprock                           2,381,000          1.90           145,000
Fresh Rock                        3,270,000          1.70           178,000
----------------------------------------------------------------------------
Total Measured & Indicated       15,917,000          1.81           926,000
----------------------------------------------------------------------------
                               Inferred Mineral Resources
----------------------------------------------------------------------------
Laterite                            894,000          0.76            22,000
Saprolite                         9,257,000          1.29           383,000
Saprock                           3,164,000          1.42           144,000
Fresh Rock                        4,415,000          1.76           250,000
----------------------------------------------------------------------------
Total Inferred                   17,730,000          1.40           799,000
----------------------------------------------------------------------------
----------------------------------------------------------------------------
(i) All figures rounded to reflect the relative accuracy of the estimates.
    Reported Resources are within optimized pit shells at a cut-off grade of
    0.5 g/t gold
Notes to the Mineral Resource Estimate:

1. The Qualified Persons responsible for the preparation of this NI 43-101 compliant resource estimate are Dr. Jean-Francois Couture, P.Geo., Principal Resource Geologist; Martin Pittuck, C. Eng, Principal Resource Geologist; and James Gilbertson, C.Geol, Senior Exploration Geologist; all with SRK. Dr. Couture, Mr. Pittuck, and Mr. Gilbertson have reviewed the content of this news release. A complete technical report will be filed on SEDAR within 45 days.

2. The effective date of the Mineral Resource Statement is April 23, 2009.

3. Details of the key assumptions, parameters, and methods used to estimate the above Mineral Resource estimate are as follows:

The Mineral Resources were estimated using a geostatistical block modelling approach constrained by gold mineralization wireframes. Gold grades were estimated using ordinary kriging based on capped composited data and estimation parameters derived by variography.

In order to determine the quantities of material offering reasonable prospects for economic extraction from an open pit, SRK used a pit optimizer to evaluate the profitability of each resource block based on optimization parameters derived, in part, from ongoing engineering studies undertaken by High River and adjusted where appropriate.

----------------------------------------------------------------------------
Key assumptions and parameters                                       Values
----------------------------------------------------------------------------
Wireframe external cut-off grade                                    0.2 g/t
----------------------------------------------------------------------------
Resource block model internal block cut-off grade                   0.5 g/t
----------------------------------------------------------------------------
Pit optimizer gold price                                         US $910/oz
----------------------------------------------------------------------------
Pit optimizer metallurgical recovery (CIL)                               90%
----------------------------------------------------------------------------
Pit optimizer mining and processing
 costs (open-pit, CIL)                               US $20/tonne processed
----------------------------------------------------------------------------
Pit optimizer pit slope                                          45 degrees
----------------------------------------------------------------------------
Grade Capping levels (trenches)                                      10 g/t
----------------------------------------------------------------------------
Grade Capping levels (drill holes)                                15-25 g/t
----------------------------------------------------------------------------

The reader is cautioned that the results from the pit optimization work are
used solely for the purpose of reporting Mineral Resources that have
"reasonable prospects" for economic extraction by an open pit and do not
represent an attempt to evaluate Mineral Reserves for this project.

Mineral Resources are not Mineral Reserves and do not have demonstrated
economic viability. There is no certainty that all or any of the Mineral
Resources will be converted into Mineral Reserves.
Measured Resources are those portions of the block model that have good continuity, good quality local grade estimation, and are defined by tight drill spacing (20 metre drill spacing).

Indicated Resources are those portions of the block model that exhibit good continuity and reasonable quality local grade estimation.

Inferred Resources were all remaining resource blocks.

4. SRK is unaware of any environmental, permitting, legal, title, taxation, socio-political, marketing or other issues which would materially affect the Mineral Resource estimates.

About High River

High River is a gold company with interests in producing mines and advanced exploration projects in Burkina Faso and Russia.
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