Bahuerachi Deposit - Mexico - 100% owned

Tyler’s Bahuerachi deposit is Mexico’s largest undeveloped copper-zinc (Mo-Ag-Au) resource. Tyler expects to complete a Bahuerachi pre-feasibility study in 2008 that will significantly build on the results of a November 2007 National Instrument 43-101 (“NI 43-101”) compliant Preliminary Economic Assessment Report or scoping study. The pre-feasibility study will be based on a new resource estimate, updating a resource disclosed in May 2007. The updated resource estimate will incorporate all drilling information generated from May to December of 2007. This new drilling information, expected to include more than 48 drill holes in 8,000 meters of drilling since May 2007, including significant mineralization intercepts in five drill holes disclosed by Tyler on June 13, 2007, six drill holes disclosed by Tyler on August 2, 2007, and all current and ongoing drilling, was not incorporated into the September scoping study and the May 2007 resource estimate.

Independent Mining Consultants of Tucson, Arizona prepared the November 2007 scoping study. The final version of the scoping study is available at this link. Using 3 year backward average metal price assumptions, which are substantially lower than current metal prices, the scoping study suggests the Bahuerachi deposit could generate a pre-tax internal rate of return of over 53%, a preproduction capital payback of less than two years and a net present value of US$1.9 billion at an 8% discount rate. The scoping study suggests that Bahuerachi could support an initial mine life of 12 years based on an analysis of only 251 million tonnes, or 41%, of the measured, indicated and inferred resource tonnage identified in the May 2007 Bahuerachi resource estimate.

The Bahuerachi Deposit shows coherent metals distribution in a geometry consistent with standard pit design methodologies, and is open for expansion in all directions. Current drilling is focused on expanding the Resource model in the northwest part of the current pit design area, which would result in a widening of pit design, and therefore a deeper pit that is likely to capture a larger portion of the May 2007 resource base at depth.

The Independent Qualified Persons who authored the November 2007 scoping 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 NI 43-101 for the disclosure of mineral projects. Tyler cautions that the November 2007 scoping study is a preliminary assessment and is preliminary in nature. It includes inferred mineral resources that are considered too speculative geologically to have the economic considerations applied to them that would enable them to be categorized as mineral reserves, and there is no certainty that the preliminary assessment will be realized.

The May 2007 resource estimate for the Bahuerachi deposit is available at this link. Keith McCandlish, P, Geol., is responsible for this resource estimate and is an Independent Qualified Person as defined by NI 43-101. A summary of the May 2007 resource estimate is included in the table below.

Bahuerachi Main Zone Deposit at a 0.2% copper grade cutoff

Resource Category classification	Tonnes	Cu (%)	Mo (%)	Au (g/t)	Ag (g/t)	Zn (%)	CuEq Grade (%) *	CuZnEq Grade (%) *
Measured	92,398,260	0.47	0.008	0.05	3.86	0.44	0.61	0.84
Indicated	432,111,525	0.38	0.008	0.03	4.07	0.57	0.52	0.82
Measured + Indicated	524,509,785	0.40	0.008	0.03	4.03	0.55	0.54	0.83
Inferred	80,174,744	0.38	0.007	0.02	3.11	0.45	0.49	0.74

*For the purpose of the final report as delivered by AGL, CuEq and CuZnEq grades based on revised metal price assumptions as follow: Copper US$1.50/lb, Molybdenum US$15.00/lb, Gold US$550/Oz, Silver US$10.00/Oz and Zinc US$0.80/lb. Copper equivalents, metallurgical recoveries and net smelter returns are assumed to be 100%.






In consideration of the near-surface nature of the Bahuerahci Deposit, grades comparable to currently operating mines, favorable distribution of mineralization, sheer current scale and the fact that the deposit remains open for expansion in every direction, the Company remains fully committed to continue on with its current work programs and development studies to accelerate the process of enhancing shareholder value as the project advances closer to feasibility, development and production. The Company is also committed to continuing exploration in this emerging district for additional deposits.

This page was updated on November 15, 2007

Jean Pierre Jutras, P.Geol, Tyler’s President and Chief Executive Officer and a Qualified Person as defined by NI 43-101 for the disclosure of mineral projects, has reviewed and approved the technical disclosure contained in this web page.