American Bonanza Continues to Drill High Grade Gold at Copperstone.Business Editors VANCOUVER, British Columbia--(BUSINESS WIRE)--Dec. 3, 2003 AMERICAN BONANZA GOLD MINING CORP. ("Bonanza") is pleased to report additional drill results from the underground core drilling program in progress at the D-Zone target at the 100% owned Copperstone Project in Arizona. These drill holes complete the southern fan of drill holes at the D-Zone, the first results of which were announced on November 11, 2003. The most significant intercept of the previously announced drill holes was a 40 foot zone grading 41 grams per tonne gold (1.2 ounces per ton gold), including an interval 18 feet long grading 79 grams per tonne gold (2.3 ounces per ton of gold). The current two drill holes were drilled below previous holes. Drill hole number 4 encountered a 32 foot interval grading 23 grams per tonne gold (0.67 ounces per ton gold), including an interval 12 feet long grading 43 grams per tonne gold (1.3 ounces per ton of gold). The following table is a summary of assay results for these two underground core drill holes from the D-Zone drilling program; all holes were drilled due east as were the previously announced holes:
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Drill Dip Re- Interval Gold Gold
Hole Length (de- covery From - To Length Grade Grade
Number (feet) grees) (%) (feet) (feet) (opt) (g/t)
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4 199 -5 100 55.3-69.6 14.3 0.446 15.3
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4 100 148-180 32 0.667 22.9
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Including:
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4 100 162-174 12 1.253 43.0
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5 340.1 -15 100 89-96.2 7.2 0.167 5.7
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5 100 104-117 13 0.099 3.4
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Drill hole number 5 was terminated before encountering the main D-Zone structure, and will be lengthened. All assays at Copperstone are at least triple-checked routinely. Preliminary reviews of the cross section developed by this drilling indicate a maximum true thickness of between 15 and 20 feet for the main D-Zone high grade structure. Drilling continues on the remainder of the planned 9,000 foot D-Zone Underground drill program. Mr. Brian Kirwin, President and CEO (1) (Chief Executive Officer) The highest individual in command of an organization. Typically the president of the company, the CEO reports to the Chairman of the Board. stated: "These bonanza grades continue to be an encouraging indication of the potential of Copperstone to ultimately support a significant, extremely low cost gold mine. Exploration and development activities at Copperstone will continue to accelerate in the coming months." DETAILED INFORMATION The Copperstone 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. occurs within a package of sedimentary and volcanic rocks, in northwest striking, moderate to shallow dipping fault zones, principally the Copperstone Fault. Intensely sheared, 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 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. Gold mineralization is restricted to these fault zones, with little to no gold mineralization present in the wallrocks. The reported drill intercepts are drilled thicknesses, as more information is required to construct cross sections and determine true thickness, which will be reported in the future when the required information has been obtained through additional drilling. Future exploration and development efforts will target these 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. 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 an international drilling contractor, Layne Christensen Company of Chandler, Arizona. 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. The core is NQ2 size, about 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 surface to Bonanza's core processing facility on site at Copperstone by Bonanza personnel. The core is then 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 5.7 pounds. 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. Bonanza personnel transport the samples to America West Airlines' airfreight air·freight n. 1. A system of transporting freight by air. 2. The amount charged for transporting freight by air. air desk at the Lake Havasu City, Arizona Lake Havasu City is a city in Mohave County, Arizona, USA. According to 2005 Census Bureau estimates, the population of the city is 55,338.[1] Bridge A popular tourist attraction in Lake Havasu City is the London Bridge, which crosses an 8ft (2. airport. America West Airlines America West Airlines was one of the United States' ten major airlines. The airline was based in Tempe, Arizona, and is now a part of US Airways Group. At the time of its integration into US Airways, the airline maintained two hubs, one at Phoenix Sky Harbor International transport the samples to the airport in Reno, Nevada. There, 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 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 channel 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 three times using 2-assay ton fire assay charges with a gravimetric finish. Reported gold grades are the average of these three assays for each sample. All samples greater than 0.100 opt, standards, and blanks are routinely submitted to additional labs for verification. An additional routine 12 duplicate, standard and blank assays were performed for the three drill holes announced here. Check assays are routinely submitted to BSI-Inspectorate, Sparks, NV and Chemex Labs, Sparks, NV for 2- or 5-assay ton gold analysis. Both labs are ISO 9002 certified. Bonanza personnel deliver the samples to the check labs. A total of 40 samples for check assay have been delivered to these labs. Additional information about Bonanza can be obtained at: www.americanbonanza.com AMERICAN BONANZA GOLD MINING CORP. (signed) Brian Kirwin President and Chief Executive Officer The TSX Venture Exchange TSX Venture Exchange Originally called the Canadian Venture Exchange (CDNX), this was a result of the merger of the Vancouver and Alberta stock exchanges. The goal of TSX Venture Exchange is to provide venture companies with effective access to capital while protecting investors. has not reviewed and does not accept responsibility for the adequacy or accuracy of this news release. |
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