Mansfield Minerals Inc.: Drilling Confirms Higher Grade Copper-Gold Mineralization in Newly Discovered Sofia Zone at Rio Grande Project, Argentina.VANCOUVER Vancouver, city, Canada Vancouver, city (1991 pop. 471,844), SW British Columbia, Canada, on Burrard Inlet of the Strait of Georgia, opposite Vancouver Island and just N of the Wash. border. , 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 -- Mansfield Mansfield, city and district, England Mansfield, city (71,325) and district, Nottinghamshire, central England, on the western border of Sherwood Forest. The city lies in a coal district, with manufactures of hosiery, shoes, and metal products. Minerals Inc. ("Mansfield") (TSX TSX Toronto Stock Exchange (TSE before April, 2002) TSX Transfer from Stack Pointer to Index TSX True Space Extension VENTURE:MDR MDR, n See multidrug resistance. MDR, n the abbreviation for minimum daily requirement, specifically the Minimum Daily Requirements for Specific Nutrients compiled by the United States Food and Drug Administration. )is pleased to announce results from the first five drill holes of a recently completed drill program at the Rio Grande Rio Grande, city, Brazil Rio Grande (rē`  grän`dĭ), city (1991 pop. Cu-Au project in northwestern Argentina Argentina (ärjəntē`nə, Span. ärhāntē`nä), officially Argentine Republic, republic (2005 est. pop. 39,538,000), 1,072,157 sq mi (2,776,889 sq km), S South America. conducted by
its joint venture partner, Antares Minerals Inc ("Antares").
The drill program comprises seven drill holes for a total of 1763.4
metres. Assay results are pending for the final two holes. Highlights
to date are presented in Tables 1 and 2 below and include: 86m at 0.455
Cu and 0.66 g/t Au in drill hole RGA-12 (first Antares drill hole), 38m
at 0.55% Cu and 0.77 g/t Au in RGA-15, and 66m at 0.46% Cu and 0.47 g/t
Au in RGA-16. Results are also presented for six additional trenches
and include 56m of 0.49% Cu and 0.55 g/t Au in T-31 (see Table 3 for a
summary of new trench trench: see ocean. results).These drill and trench results confirm the presence of significant higher-grade oxide oxide, chemical compound containing oxygen and one other chemical element. Oxides are widely and abundantly distributed in nature. Water is the oxide of hydrogen. Silicon dioxide is the major component of sand and quartz. Cu-Au 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. at the newly discovered Sofia Zone and also identify higher-grade oxide Cu-Au mineralization within the previously identified Discovery Zone. Antares can earn up to a 60% interest in the Rio Grande project from Mansfield by completing certain work expenditures, making certain payments and issuing shares to Mansfield over a four-year period (see press release dated July 14, 2004). John Black, President of Antares Minerals Inc. commented as follows: "We are encouraged by the results to date from our drilling and trenching campaign at Rio Grande. The objectives of this initial program were to identify new areas of mineralization and to confirm that portions of the system contain greater than 0.5% Cu and 0.5 g/t Au. The discovery of the Sofia Zone has met both of these objectives and provided us with increased confidence about the potential at Rio Grande. We are also encouraged that angle drilling in the Discovery Zone has returned better results than previous vertical drilling. In addition to the Discovery and Sofia Zones we have several additional targets to test for near-surface oxide Cu-Au mineralization as well as potential for deeper sulfide sulfide, chemical compound containing sulfur and one other element or sulfur and a radical. Sulfides may be salts or esters of hydrogen sulfide, H2S, or may be formed directly, e.g., by heating a metal with sulfur. Cu-Au mineralization. Subject to weather conditions and drill rig availability we plan to return with a more extensive drilling campaign to test these targets commencing in September of this year." Rio Grande Drill Program Antares has completed an initial drill campaign at the Rio Grande project with seven drill holes totaling 1763.4 metres. The Antares holes are numbered RGA-12 through RGA-18. Teck Corporation ("Teck") previously completed eleven drill holes (RG-01-01 to RG-01-11) at the project in 2001. Drilling was completed with a UDR-650 drill rig with the upper portions of three of the holes as reverse circulation cuttings and the majority of drilling as diamond drill core. Geochemical assay results have been received for the first five holes and the significant results are summarized in Table 1 below. The drill holes encountered a sequence of intermediate sub-volcanic intrusive rocks (Geol.) rocks which have been forced, while in a plastic or melted state, into the cavities or between the cracks or layers of other rocks. The term is sometimes used as equivalent to plutonic rocks ltname>. It is then contrasted with effusive or volcanic rocks. See also: Intrusive with variable degrees of potassic, sodic-calcic, and propylitic alteration Modification; changing a thing without obliterating it. An alteration is a variation made in the language or terms of a legal document that affects the rights and obligations of the parties to it. and local post-mineral intermediate dikes. Drill hole and trench location maps are attached at the end of this release.
Table 1. Summary of significant drill hole intercepts for Antares
drill holes RGA-12 through RGA-16, Rio Grande project, Argentina
(first five holes drilled by Antares). Drill holes RG-01-01 through
RG-01-11 were drilled by Teck Corporation in 2001.
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Drill Interval Length
Hole Zone (m) Incl. (m) Cu % Au g/t Ag g/t
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RGA-12 Discovery 0-86 86 0.45 0.66 3.8
0-46 46 0.59 0.78 3.8
110-122 12 0.21 0.31 3.5
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RGA-13 Discovery 0-18 18 0.28 0.48 4.1
8-18 10 0.41 0.71 6.1
56-130 74 0.27 0.49 3.6
74-94 20 0.42 0.72 5.6
118-130 12 0.38 0.63 5.0
144-210 66 0.36 0.14 1.9
161-167 7 0.58 0.45 4.6
180-188 8 0.22 0.39 2.6
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RGA-14 Sofia 138-190 52 0.36 0.43 5.8
168-178 10 0.77 1.07 16.1
200-242 42 0.36 0.42 6.8
214-225 10 0.72 0.84 15.4
254-267 13 0.24 0.27 3.5
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RGA-15 Sofia 14-52 38 0.55 0.77 7.0
14-22 8 0.45 2.22 20.6
70-138 68 0.32 0.25 2.0
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RGA-16 Sofia South 12-78 66 0.46 0.47 3.2
12-34 22 0.75 0.72 4.3
82-90 8 0.18 0.22 1.6
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Table 2. Locations, orientations and total depths of drill holes
RGA-12 through RGA-16.
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Azi-
Total muth Collar
Drill Hole Easting Northing Depth (deg- Plunge Elevation
Number UTM UTM (meters) rees) (degrees) (masl)
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RGA-05-12 614498.0 7230479.0 228.0 210 -60 4388
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RGA-05-13 614382.0 7230377.0 360.0 180 -60 4397
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RGA-05-14 614410.0 7231128.0 272.2 65 -60 4494
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RGA-05-15 614485.0 7231150.0 177.0 65 -50 4520
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RGA-05-16 614490.0 7230875.0 216.0 60 -50 4467
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RGA-05-17 614241.0 7231316.0 182.0 35 -50 4515
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RGA-05-18 614416.0 7230849.0 328.2 65 -60 4451
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Drill holes RGA-12 and RGA-13 were completed in the Discovery Zone where previous vertical drilling by Teck (RG-01 to RG-04) encountered widespread oxide Cu-Au mineralization. RGA-12, Antares' first drill hole, was collared approximately equidistant e·qui·dis·tant adj. Equally distant. e  qui·dis tance n. between Teck holes
RG-01-02 (66m at 0.38% Cu and 0.39 g/t Au) and RG-01-03 (66m at 0.36 %
Cu and 0.43 g/t Au) and drilled at an angle of -60 degrees towards
RG-01-02 to better test a series of steeply dipping 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. fractures Fractures Definition A fracture is a complete or incomplete break in a bone resulting from the application of excessive force. Description . RGA-12 intersected oxidized oxidized having been modified by the process of oxidation. oxidized cellulose see absorbable cellulose. Cu-Au mineralization with 86m at 0.45% Cu and 0.66 g/t from the surface including the first 46m at 0.59% Cu and 0.78 g/t Au. RGA-13 was collared near RG-01-02 and drilled at -60 degrees to the south to test the southern margin of the Discovery Zone beneath Antares trench T-23 (see press release of February 02, 2005). This hole encountered multiple zones of oxidized Cu-Au mineralization to a depth of 210m (see Table 1). Drill holes RGA-14, RGA-15, and RGA-16 were completed in the Sofia Zone to test mineralization that was recently discovered in Antares trench T-28 (see press release of February 02, 2005). RGA-14 and RGA-15 form a drill fan to test the down dip extension of the mineralization encountered in trench T-28 (108m at 0.57% Cu and 0.92 g/t Au). RGA-14 intersected the mineralized zone approximately 200m below the surface and from 138-242m encountered two zones of mineralization (52m at 0.36% Cu and 0.43 g/t Au and 42m at 0.36% Cu and 0.42 g/t Au) that are separated by a 10m zone of weakly weak·ly adj. weak·li·er, weak·li·est Delicate in constitution; frail or sickly. adv. 1. With little physical strength or force. 2. With little strength of character. mineralized rock. Portions of the lower zone of mineralization are only partially oxidized. Near the bottom of RGA-14, a zone of well-developed stockwork anhydrite-chalcopyrite-pyrite veining vein·ing n. Distribution or arrangement of veins or veinlike markings. is present with evidence of multiple intrusive in·tru·sive adj. 1. Intruding or tending to intrude. 2. Geology Of or relating to igneous rock that is forced while molten into cracks or between other layers of rock. 3. Linguistics Epenthetic. events. This zone contains low-grade low-grade Of or relating to debt that has a credit rating of B or below. Low-grade debt offers an above-average yield but entails substantial risk because promised payments may not be made in a timely manner. porphyry Porphyry, Greek scholar Porphyry (pôr`fĭrē), c.232–c.304, Greek scholar and Neoplatonic philosopher. He studied rhetoric under Cassius Longinus and philosophy under Plotinus. Cu-style mineralization (13m at 0.24% Cu and 0.27 g/t Au). RGA-15 intersected the mineralized zone at approximately 100m depth below surface and encountered an upper oxide zone with 38m at 0.55% Cu and 0.77 g/t Au and a lower oxide zone with 68m at 0.32% Cu and 0.25 g/t Au. The zones are separated by 18m of poorly mineralized rock. The upper zone also hosts an 8m interval with better-grade gold mineralization (8m at 0.45% Cu and 2.22 g/t Au) that represents the immediate down-dip extension of the higher-grade gold zone previously reported from trench T-28. This higher-grade gold zone is not identified at depth in RGA-15 and also does not appear to continue along strike to other trenches to the north and south of T-28. RGA-16 was completed approximately 275m to the south of the section formed by T-28, RGA-14, and RGA-15 and slightly more than 300m to the north of drill hole RG-01-03 at the northernmost end of the Discovery Zone (see map at CCNMatthews website Rio Grande maps: http://www2.ccnmatthews.com/database/fax/2000/331ant.pdf). RGA-16 intersects the down-dip extension of mineralization exposed in trench T-32. Assay results from T-32 are pending, however the trench exposes abundant black and green Cu-oxide minerals that appear to represent the southward south·ward adv. & adj. Toward, to, or in the south. n. A southward direction, point, or region. south strike extension of the mineralization encountered in T-28. RGA-16 intersected the mineralized zone at an average depth of approximately 50m below the surface and encountered 66m at 0.46% Cu and 0.47 g/t Au including an interval of 22m at 0.75% Cu and 0.72 g/t Au. Assay results are pending for RGA-17, located approximately 225m to the northwest of RGA-14 to test for the NW extension of the Sofia Zone, and RGA-18, located on the same section as T-32 and RGA-16 to test for the deeper extension of mineralization. Update on Rio Grande trenching Four new trenches have been completed at Rio Grande for a total of fourteen trenches by Antares (approximately 3800 total metres). Assay results were previously reported for three trenches (T-23, T-24, and T-28). New results have been received for all or portions of six additional trenches. Significant results from all Antares trenching to date are listed in Table 3 below. All trenches to date have encountered intervals of at least anomalous a·nom·a·lous adj. 1. Deviating from the normal or common order, form, or rule. 2. Equivocal, as in classification or nature. to weak Cu-Au mineralization. The most significant of the newly reported trench results is from T-31, located about 50m to the south of T-28, where the southern extension of the T-28 mineralization is intersected with 86m at 0.39% Cu and 0.41 g/t Au including 56m at 0.49% Cu and 0.55 g/t Au. Trench T-30 is located approximately 75m north of T-28 and only encountered lower-grade mineralization but has been strongly affected by supergene su·per·gene n. A group of closely linked genes occupying a large chromosomal segment and frequently functioning as a genetic unit. leaching leaching, method of extraction in which a solvent is passed through a mixture to remove some desired substance from it. A simple example is the passage of boiling water through ground coffee to dissolve and carry out the chemicals necessary for producing the beverage. and post-mineral diking. Trench T-27, located approximately 225m to the northwest of T-28 has also been affected by supergene leaching and the lower Cu values encountered may not be representative of the potential at depth.
Table 3. Significant geochemical assay results for trenches T-23
through T-31, Rio Grande project, Argentina. Trenches marked with an
(1) were previously reported (Antares Press Release of February 02,
2005) although receipt of additional assays have slightly modified
some of the reported intervals.
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Cu Au Ag
Trench Zone Interval length % g/t g/t
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T-23(1) Discovery 0-108 m 108 m 0.33 0.42 3.2
incl. 64-100 m 36 m 0.54 0.65 4.0
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T-24(1) Central 182-232 m 50 m 0.12 0.25 0.5
incl. 202-212 m 10 m 0.32 0.39 0.5
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T-25 DDH 7 154-200 m 46 m 0.15 0.10 0.8
incl. 192-200 m 8 m 0.20 0.28 1.3
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T-26 Central 52-62 m 10 m 0.11 0.33 0.8
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T-27 Sofia North 76-80 m 4 m 0.16 0.70 26.8
and 110-116 m 6 m 0.35 1.24 13.4
incl. 112-114 m 2 m 0.80 3.34 31.4
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T-28(1) Sophia 10-22 m 12 m 0.28 0.16 1.5
and 76-184 m 108 m 0.57 0.92 3.8
incl. 76-136 m 60 m 0.82 0.66 3.1
incl. 86-130 m 44 m 0.95 0.79 3.7
incl. 156-184 m 28 m 0.30 2.00 7.2
incl. 168-182 m 14 m 0.20 3.41 10.7
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T-29 NW of erratic anomalous values
Discovery
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T-30 Sofia 20-46 m 26 m 0.26 0.08 0.4
and
64-90 m 26 m 0.30 0.22 1.6
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T-31 Sofia 0-86 m 86 m 0.39 0.41 1.6
incl. 0-56 m 56 m 0.49 0.55 2.0
incl. 0-36 m 36 m 0.64 0.70 2.5
incl. 74-86 m 12 m 0.38 0.35 1.4
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Logging and sampling of drill cuttings Drill cuttings typically refer to any solids removed from a wellbore while drilling. The term specifically refers to shale cuttings generated when drilling petroleum wells, and is usually removed by circulating the drilling fluid over shale shakers. and core were completed by Antares geologists A geologist is a contributor to the science of geology. Geologists are also known as earth scientists or geoscientists. The following is a list of famous or notable geologists. on the project site. Trench samples were cut by a portable diamond saw under supervision by Antares geologists. Drill and Trench samples were bagged, sealed, and shipped directly to the ALS Als (äls), Ger. Alsen, island, 121 sq mi (313 sq km), Sønderjylland co., S Denmark, in the Lille Bælt, separated from the mainland by the narrow Alensund. Chemex preparation facility in Mendoza, Argentina Mendoza is a city in the west of Argentina, and the capital of Mendoza Province. As per the 2001 census INDEC] it has about 111,000 inhabitants, plus 848,660 in its metropolitan area, making it the fourth-largest conurbation in Argentina. for sample preparation. Sample pulps were then shipped to the ALS Chemex facility in La Serena, Chile La Serena ("the serene one") is the second oldest city in Chile. The city, located 471 km north of Santiago, has a population of 147,815, according to the 2002 census. There are also 12,333 inhabitants of the immediately surrounding countryside. for analysis. All samples were analyzed an·a·lyze tr.v. an·a·lyzed, an·a·lyz·ing, an·a·lyz·es 1. To examine methodically by separating into parts and studying their interrelations. 2. Chemistry To make a chemical analysis of. 3. for gold by a 30 gram fire assay with an AA finish and 34 elements via an aqua regia aqua regia (äk`wə rē`jēə) [Lat.,=royal water], corrosive, fuming yellow liquid prepared by mixing one volume of concentrated nitric acid with three to four volumes of concentrated hydrochloric acid. digest with an ICP-AES ICP-AES Inductively Coupled Plasma Atomic Emission Spectroscopy ICP-AES Inductively Coupled Plasma Atomic Emission Spectrophotometry analysis. Samples that exceed 1% Cu were reanalyzed utilizing an aqua regia digest with an AA analysis. Antares inserts certified See certification. control standards, coarse field blanks, and duplicates into the sample stream to monitor data quality. All of Antares' exploration programs and pertinent PERTINENT, evidence. Those facts which tend to prove the allegations of the party offering them, are called pertinent; those which have no such tendency are called impertinent, 8 Toull. n. 22. By pertinent is also meant that which belongs. Willes, 319. disclosure of a technical or scientific nature are prepared by or prepared under the direct supervision of John Black, President of Antares, who serves as the qualified person (QP) under the definitions of National Instrument 43-101. About Mansfield Minerals Inc. Mansfield is a mining exploration company led by a team of experienced prospect generators and dealmakers. Mansfield has focused its efforts in northwestern Argentina since August 1994. The company's business plan mandates managing risk by leveraging its early property acquisition strategy through joint ventures with other exploration/mining companies. On behalf of the Board of Directors, Gordon P. Leask, P.Eng., President Certain disclosure in this release, including management's assessment of Antares' plans and projects, constitutes forward-looking statements forward-looking statement A projected financial statement based on management expectations. A forward-looking statement involves risks with regard to the accuracy of assumptions underlying the projections. that are subject to numerous risks, uncertainties and other factors relating to relating to relate prep → concernant relating to relate prep → bezüglich +gen, mit Bezug auf +acc Antares' operation as a mineral exploration company that may cause future results to differ materially from those expressed or implied. Readers are cautioned not to place undue reliance on forward-looking statements. 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 release. Mansfield Minerals Inc. (TSX VENTURE:MDR) |
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