American Bonanza Reports High Grade Drilling with 32.5 g/t Gold Over 4.2 Metres.VANCOUVER, British Columbia British Columbia, province (2001 pop. 3,907,738), 366,255 sq mi (948,600 sq km), including 6,976 sq mi (18,068 sq km) of water surface, W Canada. Geography -- AMERICAN BONANZA GOLD CORP. (TSX TSX Toronto Stock Exchange (TSE before April, 2002) TSX Transfer from Stack Pointer to Index TSX True Space Extension :BZA BZA Board of Zoning Appeals BZA Board of Zoning Adjustment BZA Benzoic Acid BZA Beach Zone Array BZA Brandeis Zionist Association ) is pleased to announce continued very impressive high grade drilling results from its 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 this program are conversion of known historic indicated and inferred resources into measured resources and reserves, and mine planning. A total of 73 holes have been drilled with a combined length of 6,500 metres. Approximately 300 metres in 3 planned holes remain to be drilled in the underground drilling program. The presence of gold mineralization Mineralization The process by which the body uses minerals to build bone structure. Mentioned in: Rickets mineralization, n the bioprecipitation of an inorganic substance. is evident in all holes drilled with the most significant high-grade intercepts including a 4.2 metre zone grading 32.5 g/t gold in drill hole number DU5-70; a 4.6 metre zone grading 29.0 g/t gold in drill hole number DU5-70; a 7.1 metre zone grading 18.5 g/t gold in drill hole number DU5-71; and a 3.0 metre zone grading 17.4 g/t gold in drill hole number DU5-73. As previously reported, these D-Zone drill intercepts are oblique to the mineralized min·er·al·ize v. min·er·al·ized, min·er·al·iz·ing, min·er·al·iz·es v.tr. 1. To convert to a mineral substance; petrify. 2. To transform a metal into a mineral by oxidation. 3. Copperstone fault; true thickness of the D-Zone ranges up to 7 metres thick. Modelling to determine true thickness for the intercepts announced here is ongoing; current estimates indicate true thicknesses are about one-half of the drilled thicknesses reported here. The following table is a summary of assay results for this group of underground holes: ---------------------------------------------------------- Hole From-To Intercept Gold Gold Copper ID (ft) (m) (g/t) (opt) (%) ---------------------------------------------------------- DU5-69 16.1-26.8 3.3 TR TR 1.8 ---------------------------------------------------------- and 47.8-50.7 0.9 3.9 0.115 0.3 ---------------------------------------------------------- DU5-70 44-59 4.6 29.0 0.846 0.3 ---------------------------------------------------------- including 53.5-56.6 0.9 124.8 3.640 0.5 ---------------------------------------------------------- and 79-92.7 4.2 32.5 0.947 TR ---------------------------------------------------------- including 84.9-87.8 0.9 127.5 3.719 TR ---------------------------------------------------------- DU5-71 37.7-61 7.1 18.5 0.539 0.7 ---------------------------------------------------------- including 38.7-47.8 2.8 35.9 1.048 0.4 ---------------------------------------------------------- and 66.5-71.3 1.5 15.2 0.444 1.8 ---------------------------------------------------------- and 89.8-102.2 3.8 3.9 0.115 0.5 ---------------------------------------------------------- DU5-72 66.9-73.9 2.1 8.1 0.237 TR ---------------------------------------------------------- and 87.9-94 1.9 6.7 0.196 0.2 ---------------------------------------------------------- DU5-73 69-79 3.0 17.4 0.508 0.3 ---------------------------------------------------------- The surface drilling program continues on the project with a total of 6 drilling rigs currently active. Assays are pending on the surface drilling program. Brian Kirwin, President and Chief Executive Officer stated, "These impressive drill results continue to highlight the success we are having at Copperstone. These high-grade gold values are a distinctive characteristic of the Copperstone gold deposits. As the focus of our drilling changes to emphasize exploration our objective will be the discovery of additional high-grade deposits." Drill Hole Location Table: ------------------------------------------------------------------ Hole ID T.D. (m) Northing Easting Elevation Azimuth Inc. ------------------------------------------------------------------ DU5-69 33.2 1047547.0 332778.5 302.5 125 27 ------------------------------------------------------------------ DU5-70 54.4 1047555.6 332711.9 300.0 120 12 ------------------------------------------------------------------ DU5-71 48.5 1047555.6 332711.9 300.0 120 24 ------------------------------------------------------------------ DU5-72 70.1 1047553.2 332710.6 298.0 140 10 ------------------------------------------------------------------ DU5-73 57.6 1047553.2 332710.6 301.0 140 20 ------------------------------------------------------------------ Additional information about Bonanza can be obtained at: www.americanbonanza.com. DETAILED INFORMATION The Copperstone gold mineralization occurs within a package of sedimentary and volcanic rocks rocks which have been produced from the discharges of volcanic matter, as the various kinds of basalt, trachyte, scoria, obsidian, etc., whether compact, scoriaceous, or vitreous. See also: Volcanic , in northwest striking, moderate to shallow dipping fault zones, principally the Copperstone Fault. Intensely sheared sheared adj. Shaped or finished by shearing, especially cut or trimmed to a uniform length: a sheared fur coat. Adj. 1. , altered and replaced rock characterizes the Copperstone Fault in the vicinity of the D-Zone. Alteration consisting of intense hematite hematite (hĕm`ətīt), mineral, an oxide of iron, Fe2O3, containing about 70% metal, occurring in nature in red to reddish-brown earthy masses and in steel-gray to black crystalline forms. and magnetite magnetite (măg`nətīt), lustrous black, magnetic mineral, Fe3O4. It occurs in crystals of the cubic system, in masses, and as a loose sand. replacement, chloritization and silicification si·lic·i·fy v. si·lic·i·fied, si·lic·i·fy·ing, si·lic·i·fies v.tr. To convert into or impregnate with silica. v.intr. To become converted into or impregnated with silica. has been observed in the Copperstone Fault underground and is consistent with alteration visible in previous drilling and the current drilling from surface. Gold mineralization is restricted to these fault zones, with little to no gold mineralization present in the wallrocks. Future exploration and development efforts will target these mineralized faults to follow up along strike and dip Strike and dip refer to the orientation or attitude of a geologic feature. The strike of a stratum or planar feature is a line representing the intersection of that feature with the horizontal. from the current results and previously drilled mineralization. Drilling services are being provided by international drilling contractors: Layne Christensen Company of Chandler, Arizona Chandler is a city in Maricopa County, Arizona, USA. Chandler is one of the major suburbs of Phoenix. As of the 2000 census, the city population was 176,582. According to 2005 Census Bureau estimates, the population of the city is 234,939. . The drilling and assaying are conducted under the supervision of Gregory French, CPG CPG central pattern generators. #10708, a Qualified Person as defined in Canadian National Instrument 43-101. Underground core is NQ size, equaling 2 inches in diameter. The core samples are collected by Bonanza personnel at the drill for each drill hole. All of Bonanza's facilities are secure, inside the fenced compound. The core is transported to Bonanza's core processing facility on site at Copperstone by Bonanza personnel. All core is logged for recovery and other geotechnical features, prior to being sawed lengthwise length·wise adv. & adj. Of, along, or in reference to the direction of the length; longitudinally. Adj. 1. lengthwise in half by Bonanza personnel. Individual core samples are selected on a geological basis to characterize the gold mineralization associated with various rock types, alteration types and structural horizons. Subsequent to sawing and sampling, the remaining half core is geologically logged and stored on site as reference samples. Assay sample sizes average 4.4 pounds for the underground drilling. The core samples are bagged, labeled and tied at the Copperstone project site by Bonanza personnel. Geologic information is recorded on standardized sample description forms which included color, rock type, alteration, mineral species and abundance. Samples are stored in a secure facility at the Copperstone project site. DATS DATS DISN Access Transport Services (US DOD) DATS Dental Assistant Training School DATS Dead At The Scene DATS Digital Audio Transmission Service DATS Data Automated Tower Simulator Trucking, Inc. collects samples from the secure facility at Copperstone and transports the samples to representatives of American Assay Laboratories (AAL (ATM Adaption Layer) The part of the ATM protocol that breaks up application packets into 48-byte payloads which become ATM cells when the 5-byte headers are attached. The AAL resides between the higher layer transport protocols and the ATM layer. ) in Sparks, Nevada Sparks is a city in Washoe County, Nevada, United States. The population was 66,346 at the 2000 census. Estimates in 2006 place the population at around 90,000 due to rapid growth in areas such as Spanish Springs, Wingfield Springs, and D'Andrea. . There, representatives of American Assay Laboratories (AAL) in Sparks, Nevada receive the samples and take custody of the samples. AAL is ISO (1) See ISO speed. (2) (International Organization for Standardization, Geneva, Switzerland, www.iso.ch) An organization that sets international standards, founded in 1946. The U.S. member body is ANSI. / IEC (International Electrotechnical Commission, Geneva, Switzerland, www.iec.ch) An organization that sets international electrical and electronics standards founded in 1906. It is made up of national committees from over 60 countries. IEC - International Electrotechnical Commission 17025 certified and has successfully completed Canadian proficiency testing (CCRMP CCRMP Canadian Certified Reference Materials Project (MMS Canada) ). At the AAL laboratory, the core samples are dried, crushed to -10 mesh, pulverized pul·ver·ize v. pul·ver·ized, pul·ver·iz·ing, pul·ver·iz·es v.tr. 1. To pound, crush, or grind to a powder or dust. 2. To demolish. v.intr. to -150 mesh, split to 1,000 gram pulps, and fire assayed for gold two times using 2-assay ton fire assay charges with a gravimetric gravimetric /grav·i·met·ric/ (grav?i-me´trik) pertaining to measurement by weight; performed by weight, as a gravimetric method of drug assay. grav·i·met·ric adj. 1. finish. Reported gold grades are the average of these two assays for each sample. A total of 252 core samples from the underground drilling were assayed in duplicate. There is good correlation between the duplicate assays. All samples greater than 0.100 opt, standards, and blanks are routinely submitted to additional labs for verification. An additional 20 standards were inserted for assay for the drill holes announced here. Check assays are routinely submitted to BSI-Inspectorate, Sparks, NV 5-assay ton gold analysis. BSI-Inspectorate is ISO 9002 certified. Bonanza personnel deliver the samples to the check labs. AMERICAN BONANZA GOLD CORP. Brian Kirwin, President and Chief Executive Officer This news release includes certain statements that may be deemed "forward-looking statements". All statements in this release, other than statements of historical facts, including the likelihood of commercial mining, possible future financings 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 unsuccessful exploration results, changes in metals prices, changes in the availability of funding for mineral exploration, unanticipated changes in key management personnel and general economic conditions. Mining is an inherently risky business. Accordingly the actual events may differ materially from those projected in the forward-looking statements. For more information on the Company and the risks and challenges of its business, investors should review the Company's annual Form on 20F filing with the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area. Securities Commission and its home jurisdiction filings that are available at www.sedar.com. American Bonanza Gold Corp. (TSX:BZA) |
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