September 27, 2007 14:30 ET

Tyler Receives Scoping Study Confirming Potential for Large Scale Open-Pit Development and Low Cost Copper Production at Bahuerachi Project, Mexico

CALGARY, ALBERTA--(Marketwire - Sept. 27, 2007) - Tyler Resources Inc. (TSX VENTURE:TYS) ("Tyler") is extremely pleased to report positive results from its initial Scoping Study or Preliminary Economic Assessment ("PEA") on the Main Zone bulk tonnage porphyry copper-zinc-molybdenum (silver-gold) deposit of its 100% owned Bahuerachi project, Chihuahua State, Mexico.

The executive summary which has now been received by Tyler from Independent Mining Consultants ("IMC") of Tucson, Arizona, outlines robust potential for the Bahuerachi Main Zone deposit to become a significant large scale, open-pit type operation and one of Mexico's largest producers of copper, zinc and molybdenum with associated gold and silver.

At conservative Base-Case long term metal price assumptions of US $1.50/lb copper, $0.80/lb zinc, $15.00/lb molybdenum, $500.00/Oz gold and $10.00/Oz silver, the project has been estimated to be able to produce on a life-of-mine ("LOM") basis a yearly average of 183.76 million pounds of copper, 311.26 million pounds of zinc, 2.33 million pounds of molybdenum, 2.77 million ounces of silver and 14,180 ounces of gold for 12 years on the assumption of a 60,000 tonne per day milling operation. Total capital costs on a LOM basis have been estimated at US$619.25 million, with a Base-Case capital payback period occurring during production year 4. Using August 2007 three year backward average metal prices of US$2.43/Lb copper, $1.10/lb zinc, $30.85 molybdenum, $10.00/Oz silver and $544/Oz gold, capital payback period would occur during production year 2.

At Base Case metal price assumptions, the life of project operating costs are estimated to be $1.23/pound of copper contained in concentrate. Applying credits adjusted for metal recoveries for other metals produced, the operating costs reduce to $0.28/pound of copper in concentrate on a LOM basis.

The following tables summarize the estimated Net Present Value (NPV) and pre-tax and post-tax Internal Rate of Return (IRR) at various prices to outline the project's sensitivity to variations in metal prices.

Economic Evaluation Results Table from Preliminary Economic Assessment Study
Metal Prices US$ Pre-Tax Year of
--------------------------------------------------------------- Capital
Cu Mo Zn Au Ag IRR NPV @ 0% NPV @ 8% (non-
(/lb) (/lb) (/lb) (/oz) (/oz) (US$ x 1000) (US$ x 1000) discounted)
1.50 15.00 0.80 500.00 10.00 19.2% $1,013,972 $343,800 Prod. Yr 4
1.60 16.50 0.83 504.00 10.00 23.7% $1,343,777 $513,567 Prod. Yr 3
1.75 18.75 0.88 510.00 10.00 30.1% $1,853,504 $776,189 Prod. Yr 3
2.00 22.50 0.96 520.00 10.00 39.2% $2,693,032 $1,208,575 Prod. Yr 2
2.43 30.85 1.10 544.00 10.00 53.0% $4,189,671 $1,979,673 Prod. Yr 2
Note: The last line in the table shows the impact of the August 2007 three
year backward average metal prices.

Post Tax IRR and NPV
Metal Prices US$ Post 28% Tax
Cu Mo Zn Au Ag IRR NPV @ 0% NPV @ 8%
(/lb) (/lb) (/lb) (/oz) (/oz) (US$ x 1000) ($US x 1000)
1.50 15.00 0.80 500.00 10.00 16.1% $772,136 $215,591
1.60 16.50 0.83 504.00 10.00 20.0% $959,595 $339,532
1.75 18.75 0.88 510.00 10.00 25.5% $1,326,599 $530,821
2.00 22.50 0.96 520.00 10.00 33.4% $1,931,059 $843,559
2.43 30.85 1.10 544.00 10.00 45.3% $3,008,639 $1,400,745

A copy of the IMC PEA executive summary will be available on the Tyler website shortly outlining the details of the pricing and cost assumptions inputs, calculations, metal recovery assumptions and mining phases used in this first economic evaluation of the Bahuerachi Deposit's potential. A full report of the PEA study as per the requirements of National Instrument Policy 43-101 is expected to be filed on SEDAR within 45 days.

The total tonnage and grade of the resource base included in the PEA at this time consisted of 238,317,000 tonnes of measured and Indicated resources (91%), and 12,254,000 tonnes of Inferred resources (9%) at an average grade of 0.425% copper, 0.926% zinc, 0.0081% molybdenum, 0.04 g/t gold and 4.95 g/t silver.

The PEA study was based on the latest resource calculation as released by Tyler in May 2007. The minimum required for the reclassification of mineral resources to the reserve category being the completion of a pre-feasibility level study, the reader is cautioned that under National Instrument Policy 43-101, the mineral resources that are not mineral reserves are not considered to have demonstrated economic viability. The purpose of the PEA is to perform an economic analysis of the potential viability of a mineral resource taken at an early stage of the project, prior to the completion of a preliminary feasibility study.

The Board of Directors and Management of Tyler are very encouraged with the results of this assessment, and all aspects of required work to move the project into the pre-feasibility stage are now underway, including environmental, geotechnical and water testing work. The project's second metallurgical test program is now being designed to effectively test the different types of mineralization as outlined in preliminary pit designs produced as part of the PEA studies. The Company remains committed to both continue to expand the resource at the Bahuerachi Main Zone Deposit through ongoing exploration as well as fast track the pre-feasibility stage studies on the Main Deposit.

About Tyler - Tyler Resources is a well funded Canadian junior exploration company focused on base and precious metals exploration in Mexico. Tyler's primary project is the Bahuerachi property, which hosts Mexico's fourth largest mineralized porphyry deposit. As part of its ongoing drill program, the Company has now drilled in excess of 51,000 meters of combined diamond and reverse circulation drilling since 2004, making it one of the most active Canadian junior exploration companies operating in Mexico.

The Qualified Person responsible the preparation of this news release was J. P. Jutras, P.Geol., and President of the Company. The Independent Qualified Persons which were the authors of the Preliminary Economic Assessment Study were Mr. Herb Welhener, Vice President, Independent Mining Consultants, Inc., and Joseph M. Keane, P. Eng., Principal Metallurgical Engineer of K.D. Engineering Company. Both are Qualified Persons, as defined by National Instrument 43-101, and have reviewed and approved of the contents of this news release.

Jean Pierre Jutras, President/CEO/Director

Cautionary language: Except for the historical and present factual information contained herein, the matters set forth in this news release, including words such as "expects", "projects", "plans", "anticipates" and similar expressions, are forward-looking information that represents management of Tyler's internal projections, expectations or beliefs concerning, among other things, future operating results and various components thereof or the economic performance of Tyler. The projections, estimates and beliefs contained in such forward-looking statements necessarily involve known and unknown risks and uncertainties, which may cause Tyler's actual performance and financial results in future periods to differ materially from any projections of future performance or results expressed or implied by such forward-looking statements. These risks and uncertainties include, among other things, those described in Tyler's filings with the Canadian securities authorities. Accordingly, holders of Tyler shares and potential investors are cautioned that events or circumstances could cause results to differ materially from those predicted. Tyler disclaims any responsibility to update these forward-looking statements.

The TSX Venture Exchange has neither approved nor disapproved of the contents of this press release.

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