VANCOUVER, Oct. 13 /PRNewswire-FirstCall/ -- Great Basin Gold Ltd. ("Great Basin Gold" or the "Company"), (TSX: GBG; NYSE Amex: GBG; JSE: GBG) today announced updated mineral resource estimates and general project progress for its Burnstone Project in the Mpumalanga Province, South Africa. An updated mineral resource estimate has been completed inclusive of all surface drilling up to July 2009 as tabulated below. At a cut-off of 400 cmg/t, the total Measured and Indicated resources have increased by 6% from approximately 10.9 million ounces to 11.6 million ounces Au and the Inferred resources have increased from approximately 2.4 million ounces Au to 4.6 million ounces Au. ------------------------------------------------------------------------- Burnstone Mineral Resources Overall Property - October 2009 ------------------------------------------------------------------------- RESOURCE Cut-off Tonnes Au Grade Contained Au CATEGORY cmg/t millions g/t Ounces ------------------------------------------------------------------------- Measured 300 62.9 5.29 10,697,000 ------------------------------------------------------- 350 52.9 5.63 9,568,000 ------------------------------------------------------- 400 43.9 6.08 8,569,500 ------------------------------------------------------------------------- Indicated 300 22.0 6.16 4,361,300 ------------------------------------------------------- 350 15.2 7.26 3,554,700 ------------------------------------------------------- 400 10.3 9.21 3,038,600 ------------------------------------------------------------------------- TOTAL MEASURED & 300 84.9 5.51 15,058,300 INDICATED ------------------------------------------------------- 350 68.1 5.99 13,122,700 ------------------------------------------------------- 400 54.1 6.67 11,608,100 ------------------------------------------------------------------------- Inferred 300 53.2 6.78 11,582,500 ------------------------------------------------------- 350 35.5 7.69 8,771,600 ------------------------------------------------------- 400 11.8 12.14 4,588,700 ------------------------------------------------------------------------- Notes to table: 1. Mineral resources that are not mineral reserves do not have demonstrated economic viability. 2. Metallurgical recoveries are not applied to resource values. The number of boreholes utilized in the resource estimate totals 296 and, inclusive of all deflections, provides 1115 Kimberley Reef intersections. The resource model has benefited from a full database verification and validation exercise, which has led to information from 18 additional historical and 33 additional new drill holes being incorporated. Geozones of the area of interest were updated as part of the basis for the estimation. These zones are delineated by a combination of variable geological parameters such as channel width, gold grade and gold accumulation (cmg/t), footwall lithology, and sedimentary facies. The resource estimate covers a combination of mineral rights, namely those within the mining right area, granted in October 2008, and/or prospecting rights controlled by Great Basin Gold outside the mining right area. For continuity, the mineral resource classification method applied in this update is consistent with that applied in previous Burnstone mineral resource statements. A sensitivity analysis of the estimation kriging variances and the minimum number of informing samples has also been undertaken and assessed. The results demonstrate no significant or material change to the estimated total Measured and Indicated resources. The mineral resource in the Measured and Indicated categories represented within the mining right area has increased by some 6% to 11.5 million ounces. The tabulation below shows a "like for like" comparison with the January 2008 estimate. ------------------------------------------------------------------------- Burnstone Mineral Resources - Comparison of 2008 & 2009 Estimates Mining Right Area ------------------------------------------------------------------------- 2008 Mineral Resource 2009 Mineral Resource Estimate Estimate ------------------------------------------------------------------------- Au Contained Au Contained RESOURCE Cut-off Tonnes Grade Au Tonnes Grade Au CATEGORY cmg/t millions g/t Ounces millions g/t Ounces ------------------------------------------------------------------------- Measured 350 39.0 7.56 9,474,000 52.9 5.63 9,568,000 ------------------------------------------------------------- 400 33.8 7.80 8,484,000 43.9 6.08 8,569,500 ------------------------------------------------------------------------- Indicated 350 15.7 4.95 2,503,000 15.2 7.09 3,452,300 ------------------------------------------------------------- 400 15.1 4.89 2,372,000 10.2 8.97 2,936,200 ------------------------------------------------------------------------- TOTAL 350 54.7 6.81 11,977,000 68.0 5.95 13,020,300 MEASURED & ------------------------------------------------------------- INDICATED 400 48.9 6.90 10,856,000 54.1 6.62 11,505,700 ------------------------------------------------------------------------- Inferred 350 18.6 4.42 2,642,000 10.9 7.13 2,507,600 ------------------------------------------------------------- 400 17.0 4.37 2,394,000 2.9 10.84 1,008,200 ------------------------------------------------------------------------- Notes to table: 1. Mineral resources that are not mineral reserves do not have demonstrated economic viability. 2. Metallurgical recoveries are not applied to resource values. At a 400 cmg/t cut-off, the Company has an additional 102,400 ounces in the measured and indicated category and 3.58 million ounces in inferred resource in the areas adjacent to the mining right area, thereby increasing the total area (overall property) Measured and Indicated resources to 11.6 million ounces Au and the Inferred resources to 4.6 million ounces Au. These rights are held under prospecting permits. Exploration activities in these areas will continue. The Company is currently well advanced in the development program designed to take the Burnstone Project to commercial production. The Kimberley Reef has been accessed underground from the Main decline and has also been intersected in the vertical shaft. Burnstone is now continuing with reef development and is planning to commence trial stoping in October 2009. This phase of the project development will be underpinned by an ongoing diamond drill evaluation program consisting of a combination of strategically placed surface drilling, closer spaced underground delineation and cover drilling. Currently there are 6 diamond drill rigs in operation underground, and a surface contractor has recently been appointed. As at September 30, a total of 420 metres of reef development was completed with approximately 22,000 ore tons accumulated on the surface stockpile. The vertical shaft has progressed to 407 metres below surface, with 85 metres remaining to shaft bottom. Station development is currently underway on 40 Level, which will service as the haulage and tipping level. Work on the construction of the foundation for the Metallurgical Plant has been completed and contractors have moved to site to start plant erection. President and CEO Ferdi Dippenaar commented: "Development of this exciting project continues in line with plan and is on track for commissioning by end of June 2010. Another exciting aspect is the commencement of trial mining to determine optimal mining methods which gets underway during October 2009. The current mining plan has assumed the mining of only 4.1 million ounces of the 12.5 million ounces of the resource. The positive results from the ongoing surface and now underground exploration programs continue to add resource ounces which could positively impact on the future development and production profile in the Burnstone region." The Burnstone goldfield is defined by an 18 kilometre long, northwesterly trending mineralized corridor hosting the Kimberley Reef, one of four main gold-bearing units in the Witwatersrand Basin. At Burnstone, the central portion of the gold corridor has been uplifted by two northwesterly trending sub-parallel faults and as a result, a significant portion of the deposit areas along the trend occur at relatively shallow depths of 200-750 metres. The mineral resource estimation was done using geostatistical methods by Deon van der Heever, Pr.Sci.Nat., an independent Qualified Person as defined by Canadian Securities Regulations in National Instrument 43-101. The primary analytical facility for the Burnstone Project from 2003-2005 has been SGS Lakefield Research Africa (Pty) Limited and subsequently (2006-2009), ALS Chemex has been the primary laboratory. Both facilities are located in Johannesburg, South Africa. Johan Oelofse, PrEng, FSAIMM, Chief Operating Officer for Great Basin Gold, and a Qualified Person as defined by Canadian Securities Regulations in National Instrument 43-101, has reviewed and approved the information in this news release. Ferdi Dippenaar President and CEO No regulatory authority has approved or disapproved the information contained in this news release. Cautionary and Forward-Looking Statement Information 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, bank loan arrangements, 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 for precious metals, credit availability, development 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 Canadian jurisdiction filings that are available at http://www.sedar.com/. Information Concerning Estimates of Measured, Indicated and Inferred Resources This news release also uses the terms "measured resources", "indicated resources" and "inferred resources". The Company advises investors that although these terms are recognized and required by Canadian regulations (under National Instrument 43-101 Standards of Disclosure for Mineral Projects), the U.S. Securities and Exchange Commission does not recognize them. Investors are cautioned not to assume that any part or all of the mineral deposits in these categories will ever be converted into reserves. In addition, "inferred resources" have a great amount of uncertainty as to their existence, and economic and legal feasibility. It cannot be assumed that all or any part of an Inferred Mineral Resource will ever be upgraded to a higher category. Under Canadian rules, estimates of Inferred Mineral Resources may not form the basis of feasibility or pre-feasibility studies, or economic studies except for Preliminary Assessment as defined under 43-101. Investors are cautioned not to assume that part or all of an inferred resource exists, or is economically or legally mineable. DATASOURCE: Great Basin Gold Ltd. CONTACT: on Great Basin Gold Ltd. and its gold properties, please visit the Company's website at http://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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