Trevali Resources Corp.
CNQ : ZINC
PINK SHEETS : TREVF
FRANKFURT : 4T1

Trevali Resources Corp.

May 07, 2008 09:30 ET

Trevali Completes Santander Tailings Resource Definition Program

Outlining readily exploitable bulk-tonnage zinc resource

VANCOUVER, BRITISH COLUMBIA--(Marketwire - May 7, 2008) - Trevali Resources Corp. ("Trevali" or the "Company") (CNQ:ZINC)(PINK SHEETS:TREVF)(FRANKFURT:4T1) is pleased to announce that outstanding borehole assay results from the tailings resource definition program at its Santander Zn-Pb-Ag project, located in the province of Huaral, west-central Peru, indicates the presence of a potentially large bulk-tonnage and low-cost zinc resource. The program has been successfully completed within budget and ahead of schedule.

These highly positive results will greatly empower the Company to realize its plan of achieving initial cash flow through commercial concentrate production, in conjunction with low capital and operational expenditures, in late 2008 - preceding planned production from high-grade hard rock material.

Results confirm initial interpretations indicating mineralization is thickest and higher grade in the north-western portion of the tailings impoundment -- thinning gradually towards the south-eastern area (see TRC-NR-08-04) (Table 1 & Figure 1). The average grade of the tailings is 2.09% Zn within which a higher-grade zone in the northwestern quadrant averaged 2.78% Zn (Figure 1).

The Operations Team (Mining - Metallurgy - Geology) is currently finalizing the mining and process flow sheets but they envisage a very efficient and simple process greatly aided by the fact that the tailings are located only 150 metres from the concentrate plant and are predominantly comprised of dry material. The final flow sheets will be announced in due course.

Additionally, a representative bulk tonnage sample has been collected and is en route to Resource Development Inc., of Denver, Colorado, for optimization of the metallurgical process. Previous testwork at the Company's on site laboratory utilizing only a 1.95% zinc head-grade produced a 49% zinc concentrate using a simple single stage cleaning and scavenging process (see TRC-NR-08-03 for details).



Table 1: Summary of Initial Tailings borehole results
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Interval(i) Coarseness %
Borehole Number (metres) Zn% (+200#)(ii)
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SAN-CR-01 2 1.44 78
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SAN-CR-02 3 3.04 88
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SAN-CR-03 6 1.75 88
-----------------------------------------------------------
SAN-CR-04 5.5 1.86 91
-----------------------------------------------------------
SAN-CR-05 6.8 1.9 89
-----------------------------------------------------------
SAN-CR-06 2.5 1.66 90
-----------------------------------------------------------
SAN-CR-07 2.5 1.51 83
-----------------------------------------------------------
SAN-CR-08 4.5 3.37 85
-----------------------------------------------------------
SAN-CR-09 14.5 3.04 63
-----------------------------------------------------------
SAN-CR-10 22 3.65 77
-----------------------------------------------------------
SAN-CR-11 24.5 3.06 69
-----------------------------------------------------------
SAN-CR-12 19.4 2.67 71
-----------------------------------------------------------
SAN-CR-13 16.5 1.87 62
-----------------------------------------------------------
SAN-CR-14 16 1.55 58
-----------------------------------------------------------
SAN-CR-15 8.5 1.35 77
-----------------------------------------------------------
SAN-CR-16 5 1.2 84
-----------------------------------------------------------
SAN-CR-17 12.5 2.52 75
-----------------------------------------------------------
SAN-CR-18 32 3.27 84
-----------------------------------------------------------
SAN-CR-19 22.8 2.82 65
-----------------------------------------------------------
SAN-CR-20 22.5 2.23 72
-----------------------------------------------------------
SAN-CR-21 25.4 2.44 69
-----------------------------------------------------------
SAN-CR-22 21.3 1.83 62
-----------------------------------------------------------
SAN-CR-23 11.5 1.42 77
-----------------------------------------------------------
SAN-CR-24 6 1.42 84
-----------------------------------------------------------
SAN-CR-25 Abandoned - intersected boulders at edge of dam
-----------------------------------------------------------
SAN-CR-26 12.2 2.2 81
-----------------------------------------------------------
SAN-CR-27 16 2.58 52
-----------------------------------------------------------
SAN-CR-28 15 2.54 75
-----------------------------------------------------------
SAN-CR-29 16.5 2.15 75
-----------------------------------------------------------
SAN-CR-30 20.5 2.15 71
-----------------------------------------------------------
SAN-CR-31 21.5 1.62 60
-----------------------------------------------------------
SAN-CR-32 11.5 1.15 58
-----------------------------------------------------------
SAN-CR-33 10.5 0.76 56
-----------------------------------------------------------
SAN-CR-33A 21.5 3.49 77
-----------------------------------------------------------
SAN-CR-34 20.5 3.45 70
-----------------------------------------------------------
SAN-CR-35 12.5 2.22 68
-----------------------------------------------------------
SAN-CR-36 21 2.32 58
-----------------------------------------------------------
SAN-CR-37 23 1.77 59
-----------------------------------------------------------
SAN-CR-38 21 1.35 56
-----------------------------------------------------------
SAN-CR-39 20.5 1.77 47
-----------------------------------------------------------
SAN-CR-40 26.5 2.64 68
-----------------------------------------------------------
SAN-CR-41 27.5 3 74
-----------------------------------------------------------
SAN-CR-42 32.5 2.31 73
-----------------------------------------------------------
SAN-CR-43 23 1.91 51
-----------------------------------------------------------
SAN-CR-44 21.5 1.14 59
-----------------------------------------------------------
SAN-CR-45 24 1.37 50
-----------------------------------------------------------
SAN-CR-46 11.5 0.91 57
-----------------------------------------------------------
SAN-CR-47 21 1.94 64
-----------------------------------------------------------
SAN-CR-48 18 1.93 72
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SAN-CR-49 20 1.76 75
-----------------------------------------------------------
SAN-CR-50 23.5 1.51 48
-----------------------------------------------------------
SAN-CR-51 19.5 1.17 65
-----------------------------------------------------------
SAN-CR-52 18 1.37 72
-----------------------------------------------------------
SAN-CR-53 20 1.51 63
-----------------------------------------------------------
SAN-CR-54 23.5 1.24 80
-----------------------------------------------------------
SAN-CR-55 20.15 1.14 57
-----------------------------------------------------------
SAN-CR-59 15.5 0.89 32
-----------------------------------------------------------
Note: (i) Interval equals total borehole depth from surface
to end of hole.
(ii) Sieve tests (coarseness) performed in Company's
on-site metallurgical laboratory. Rounded to
nearest %.


To view Figure 1 accompanying this press release please click on the following link: http://media3.marketwire.com/docs/zinc0507.pdf

Tailings Background

The Santander tailings impoundment covers an area of roughly 500 by 500 metres and is located about 150 to 900 metres, at its furthest point, from the concentrate plant. Examination of historic records indicates that significant zinc mineralization reported to the tailings pond throughout its 35-year life of mine.

Percussion boreholes were drilled on 50-metre centers with results clearly demonstrating that zinc mineralization commences on surface and displays good to excellent intra and inter-hole continuity.

Golder Associates, of Vancouver, BC, has been retained to complete the resource estimate and mine scoping studies.

Project Background

The former Santander Mine produced approximately 8 million tonnes of ore at 6 - 10% zinc, between 1% and 4% lead and 60 g/t silver, plus additional copper credits from a single high grade pipe or chimney. Mining ceased in c. 11% Zn with historic exploration indicating mineralization extends for at least an additional 200 metres depth.

Site infrastructure includes a large camp and associated support facilities, an ore processing / concentrator plant (including various crushers, mills and cell houses) able to produce zinc, lead-silver and copper concentrates, and the Tingo hydro-electric power-station.

Future Work

The Company is committed to fast-tracking its Santander project to production by late 2008 -- reviewing the feasibility of initially commencing production from the potentially large tailings resource followed by high-grade hard-rock production upon receipt of all necessary permits (see TRC-NR-08-03 for details).

The current resource definition drill program is designed to define mineralization to nominal open-pittable depths, although considerable geotechnical and geological analysis and modeling is required prior to assigning the optimum mining method.

Qualified Person and Quality Control/Quality Assurance

EurGeol Dr. Mark D. Cruise, Trevali's President & CEO and a qualified person as defined by National Instrument 43-101, has supervised the preparation of the scientific and technical information that forms the basis for this news release. Dr. Cruise is not independent of the Company, as he is an officer and shareholder.

The work programs at the Company's property were designed by, and are supervised by, Mark D. Cruise, President, Trevali, and Les Oldham, General Manager, Consultora Minera Anglo Peruana S.A. (independent geological consultants), who together are responsible for all aspects of the work, including the quality control/quality assurance program. On-site personnel at the project rigorously collect and track samples which are then security sealed and shipped to ALS Chemex Laboratories, Lima, for assay. Analytical accuracy and precision are monitored by the analysis of reagent blanks, reference material and replicate samples. Quality control is further assured by the use of international and in-house standards. Blind certified reference material is inserted at regular intervals into the sample sequence by Trevali personnel in order to independently assess analytical accuracy. Finally, representative blind duplicate samples are routinely forwarded to ISO compliant third party laboratories for additional quality control.

About Trevali Resources Corp.

The Company is currently exploring and conducting various scoping level studies on the former Santander poly-metallic mine Peru in order to ascertain as best as possible the cost and feasibility of re-commencing mining operations in a timely manner should exploration prove to be successful.

The common shares of the Company are currently listed on the CNQ (symbol ZINC). For further details on the Company readers are referred to the Company's web site (www.trevaliresources.com), Canadian regulatory filings on SEDAR at www.sedar.com.

On Behalf of the Board of Directors of TREVALI RESOURCES CORP.

Mark D. Cruise, President

The CNQ has not reviewed and does not accept responsibility for the adequacy or accuracy of this release.

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