September 5, 2010

Guadalupe de los Reyes, Mexico - This project, located in the Sierra Madre Range, contains measured and indicated resources of 485,000 gold ounces and inferred resources of 316,000 gold ounces with significant silver credits. In January 2008, Vista completed an acquisition that consolidated all of the known gold and silver resources in the district under Vista's ownership.

Technical Report June 2003

Technical Report August 2009 (Amended and Restated)

Cautionary Note to U.S. Investors concerning estimates of Measured and Indicated Resources: This website uses the terms "measured and indicated resources". We advise U.S. investors that while these terms are recognized and required by Canadian regulations, the U.S. Securities and Exchange Commission does not recognize them. U.S. investors are cautioned not to assume that any part or all of mineral deposits in this category will ever be converted into reserves.

Cautionary Note to U.S. Investors concerning estimates of Inferred Resources: This website uses the term "inferred resources". We advise U.S. investors that while this term is recognized and required by Canadian regulations, the U.S. Securities and Exchange Commission does not recognize it. "Inferred resources" have a great amount of uncertainty as to their existence, and great uncertainty as to their economic and legal feasibility. It cannot be assumed that all or any part of an inferred mineral resource will ever be upgraded to a higher category. Under Canadian rules, estimates of inferred mineral resources may not form the basis of a feasibility or other economic study. U.S. investors are cautioned not to assume that any part or all of an inferred resource exists or is economically or legally mineable.

Cautionary Note to U.S. Investors concerning estimates of Proven and Probable Reserves: The estimates of mineral reserves shown in this table have been prepared in accordance with NI 43-101. The definitions of proven and probable reserves used in NI 43-101 differ from the definitions in U.S. Securities and Exchange Commission Industry Guide 7. Accordingly, the Company’s disclosure of mineral reserves herein may not be comparable to information from U.S. companies subject to the reporting and disclosure requirements of the U.S. Securities and Exchange Commission.
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