Carl and Janet Pescio P.O. Box 5831 Elko, Nevada 89802

Exhibit 10.1

Carl and Janet Pescio

P.O. Box 5831

Elko, Nevada 89802

Dear Sirs:

Re:   Arrangement and Merger Agreement made as of the 22nd day of September 2006 (the “Arrangement Agreement”), among Vista Gold Corp., Allied Nevada Gold Corp., Carl Pescio and Janet Pescio

Any capitalized term not defined herein shall have the meaning given to it in the Arrangement Agreement.

The Arrangement Agreement provides a Termination Date of “February 28, 2007 or any later date as may be agreed to in writing by Vista and the Pescios”.

This letter is an agreement by Vista and the Pescios to extend the Termination Date in the Arrangement Agreement until April 30, 2007.

Please sign the enclosed copy of this letter to evidence your agreement and return it to our counsel attention John Stark at the following address:  Stikeman Elliot LLP, Suite 1700 Park Place, 666 Burrard Street, Vancouver, BC  V6C 2X8.