American Bonanza Continues To Drill High Grade Gold In The D-Zone And Intercepts High Grade Gold In The Footwall Exploration Target At Copperstone.Business Editors VANCOUVER, British Columbia--(BUSINESS WIRE)--Jan. 14, 2004 American Bonanza Gold Mining Corp. (TSX TSX Toronto Stock Exchange (TSE before April, 2002) TSX Transfer from Stack Pointer to Index TSX True Space Extension Venture: BZA BZA Board of Zoning Appeals BZA Board of Zoning Adjustment BZA Benzoic Acid BZA Beach Zone Array BZA Brandeis Zionist Association ) ("Bonanza") is pleased to report additional drill results from the underground core drilling program in progress at the D-Zone target and from the Footwall foot·wall n. Geology 1. The mass of rock underlying a mineral deposit in a mine. 2. The underlying block of a fault having an inclined fault plane. exploration drilling program, both at the 100% owned Copperstone Project in Arizona. D-Zone Underground Core Drilling Program: The eight new underground core drill holes complete the first three fans of drill holes at the D-Zone, the first results of which were announced on November 11, 2003. These drill fans are drilled on 75 foot centers through the D-Zone. The most significant intercepts of the previously announced drill holes from these D-Zone drill fans include 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) in drill hole number 3 and drill hole number 4 which 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). The current D-Zone results are highlighted by drill hole number 12 which contains a 45 foot intercept grading 25 grams per tonne gold (0.72 ounces per ton of gold) and 1.9% copper. The following table is a summary of assay results for the 8 new underground holes from the D-Zone drilling program; all drill fans were drilled to the east and northeast into the Copperstone Fault zone:
D-Zone Underground Core Hole Summary
Hole ID From-To (ft) Intercept Gold opt Gold g/t Copper %
CUDH03-6 44 - 47.6 3.6 0.11 3.7 0.2
and 94.3 - 97 2.7 0.01 0.2 2.8
CUDH03-7 41 - 49 8 0.10 3.4 0.2
CUDH03-8 81 - 88 7 0.01 0.2 1.3
CUDH03-9 111.5 - 120 8.5 0.43 14.7 0.5
and 136.3 - 139 2.7 0.17 5.7 1.2
and 159 - 166 7 0.26 8.8 7.9
and 171 - 174 3 0.27 9.3 0.2
and 184 - 191.2 7.2 0.13 4.2 3.2
CUDH03-10 86 - 88.6 2.6 0.31 10.8 1
and 100 - 111 11 0.04 1.3 6.1
CUDH03-11 79.3 - 82.4 3.1 0.01 0.2 4.7
and 113.5 - 116 2.5 0.34 11.5 0.4
and 131 - 137.2 6.2 0.10 3.4 0.7
and 150 - 151.5 1.5 0.12 4.0 0.2
CUDH03-12 124 - 169 45 0.72 24.6 1.9
Including 133.4 - 139 5.6 1.95 67.0 1
Including 146.2 - 155.6 9.4 1.10 37.6 3.4
and 175.3 - 188.4 13.1 0.19 6.6 1
and 191 - 199 8 0.07 2.5 2.4
CUDH03-13 89 - 92 3 0.14 4.6 1.2
and 113 - 114.2 1.2 0.30 10.4 0.1
and 114.2 - 124 9.8 0.01 0.2 2.6
and 242 - 249 7 0.32 11.0 0.1
and 249 - 257.5 8.5 0.01 0.2 2.4
Drilling continues on the D-Zone underground drilling program. Significant copper assays will be reported with gold assay results in the future. 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 approximately 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. Footwall Fault Exploration Drilling Program: Bonanza also announces the results of the first exploration drilling program at Copperstone, designed to test the Footwall Fault, located approximately 300 to 400 feet below the main focus of activities, the Copperstone Fault. The Footwall fault zone has to date not been included in any resource estimation. To date assay results for the first ten holes have been received, with three additional holes completed with assays pending. The Footwall Fault appears to lie nearly parallel to the Copperstone Fault. The most significant drill intercept from the current drilling is in the latest hole assayed, hole number 10, which contains a five foot interval grading 47 grams per tonne gold (1.4 ounces of gold per ton). This very encouraging intercept will require follow-up drilling to test the 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. potential of the 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. . Data interpretation continues and will guide further drilling.
Footwall Exploration Zone Drill Hole Summary
Hole ID From (ft) To (ft) Intercept Gold opt Gold g/t
RC-03-01 220 225 5 0.24 8.1
RC-03-02 no significant assays
RCD-03-03 492.5 495 2.5 0.04 1.3
RC-03-04 430 435 5 0.11 3.7
RCD-03-05 437.5 440 2.5 0.07 2.3
and 512 517 5 0.04 1.3
RCD-03-06 no significant assays
RCD-03-07 429 438 9 0.03 1.1
RCD-03-08 550.8 560 9.2 0.24 8.1
RCD-03-09 no significant assays
RCD-03-10 466 471 5 1.38 47.3
and 567 572 5 0.07 2.4
Drill holes RC-03-01, -02 and -04 are reverse circulation drill holes. The remaining drill holes in the above table are HQ core drill holes, which produce core with a diameter of 2.625 inches. Recoveries throughout the Footwall drilling program are very good. While not drilled on a grid, spacing between the drill holes in the Footwall drilling is approximately 50 feet. An additional three holes have been completed in the Footwall Fault drilling program and assays are pending. 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. 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 from the current results and previously drilled mineralization. Drilling services are being provided by an international drilling contractor, 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. The underground D-Zone 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 pounds for the underground drilling, and 6.5 pounds for the Footwall exploration 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. 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 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. 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 38 duplicate, standard and blank assays were performed for the 18 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 51 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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