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Source CCNMatthews Date 02/10/2005 Time 08:20:37 AM Company AMERICAN BONANZA GOLD MINING CORP. Title American Bonanza Drills 36.4 Grams per Tonne Gold Over 4.2 Metres True Thickness DMIS Processed No CDNX Symbol: BZA Exchange: Mining Corp.TSX VENTURE Symbol: BZA Exchange: Symbol: Exchange: Symbol: Press Release [IMAGE] [IMAGE] [IMAGE] NEWS RELEASE TRANSMITTED BY CCNMatthews[IMAGE]FOR : American Bonanza Gold Mining Corp.TSX VENTURE SYMBOL: BZA February 10, 2005American Bonanza Drills 36.4 Grams per Tonne Gold Over 4.2 Metres True ThicknessVANCOUVER, BRITISH COLUMBIA--(CCNMatthews - Feb. 10, 2005) - American Bonanza Gold Mining Corp. (TSX VENTURE:BZA) announces an update to the underground drilling program at its 100% owned high-grade Copperstone gold project in Arizona. D-Zone Underground Core Drilling Underground core drilling continues at the D-Zone. Objectives of the program are conversion of known indicated and inferred resources into measured resources and reserves, and mine planning. A total of 56 holes have been drilled with a combined length of 5,440 metres. Approximately 1,700 metres in 20 planned holes remain to be drilled in the program, which is about 75% complete and has a budget for the entire program of approximately US$1 million. The most significant intercepts in the new assay results include a 10.5 metre zone grading 36.4 g/t gold, including 3.2 metres of 89.0 g/t gold, in drill hole number DU5-56; a 3.9 metre zone grading 47.1 g/t gold in drill hole number DU4-51; and a 5.7 metre zone grading 1.6 g/t gold and 6.8 percent copper in drill hole number DU4-53. As previously reported, these D-Zone drill intercepts are oblique to the mineralized Copperstone fault; true thicknesses of the D-Zone range up to 7 metres thick. DU5-56 has a true thickness of 4.2 metres based on cross sectional analysis. The following table is a summary of assay results for this group of underground holes from the D-Zone drilling program: /T/ --------------------------------------------------------------- Hole From - To Intercept Gold Gold Copper ID (ft) (m) (g/t) (opt) (%) --------------------------------------------------------------- DU4-51 54-66.9 3.9 47.1 1.374 TR --------------------------------------------------------------- and 82-92 3.0 13.0 0.380 TR --------------------------------------------------------------- and 96.7-104 2.2 9.0 0.262 TR --------------------------------------------------------------- DU4-52 44-62.4 5.6 10.5 0.306 TR --------------------------------------------------------------- DU4-53 48-50.4 0.7 11.2 0.326 TR --------------------------------------------------------------- and 64-67 0.9 12.1 0.352 0.9 --------------------------------------------------------------- and 84-85.3 0.4 16.9 0.494 0.5 --------------------------------------------------------------- and 103.4-105.9 0.8 11.3 0.329 0.3 --------------------------------------------------------------- and 107.2-126 5.7 1.6 0.047 6.8 --------------------------------------------------------------- DU4-54 86.3-89.6 1.0 4.5 0.131 TR --------------------------------------------------------------- and 105.6-109 1.0 5.1 0.149 0.4 --------------------------------------------------------------- and 149.8-154 1.3 33.7 0.982 TR --------------------------------------------------------------- DU4-56 0-9.0 2.7 7.7 0.224 0.3 --------------------------------------------------------------- and 81.4-115.8 10.5 36.4 1.063 0.3 --------------------------------------------------------------- including 105.3-115.8 3.2 89.0 2.597 TR --------------------------------------------------------------- /T/ Assays are pending for drill hole DU4-55. Surface drilling programs continue on the project with a total of 6 drilling rigs currently active. American Bonanza Gold Mining Corp. and International Taurus Resources Inc. (TSX:ITS) have signed a Definitive Agreement to merge companies. Approval for this agreement will be voted on by the shareholders of both companies at individual meetings to be held on March 21, 2005. DETAILED INFORMATION